# Research and Development of an IoT-Based Remote Asthma Patient Monitoring System

Authors: Safayat Reza Anan; Md. Azizul Hossain; Md. Zubayer Milky; Mohammad Monirujjaman Khan; Mehedi Masud; Sultan Aljahdali
Journal: Journal of Healthcare Engineering
 (2021)

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## Abstract

This paper presents the research and development of an Internet of Things- (IoT-) based remote health monitoring system for asthmatic patients. Asthma is an inflammatory disease. Asthma causes the lungs to swell and get narrower, making it difficult to carry air in and out of the lungs. This situation makes breathing very difficult. Remote patient monitoring (RPM) is a method of collecting health-related data from patients who are in a remote location and electronically transmitting it to healthcare providers for evaluation and consultation. The aim of this study is to design a monitoring system that allows doctors to monitor asthmatic patients from a remote area. The proposed system will allow patients to measure oxygen saturation (SpO2), heart rate, body temperature, humidity, volatile gases, room temperature, and electrocardiogram (ECG) using various sensors, which will be displayed in an application. This data is then sent to the doctor to monitor the patient’s condition and suggest appropriate actions. Overall, the system consists of an Android application, a website, and various sensors. The Android studio and Java programming language were used to develop the application. For the frontend, the website was built using Hypertext Markup Language (HTML), Cascading Style Sheets (CSS), JavaScript, and jQuery. The system also uses Django, a Python-based open-source web framework, for the backend. The system developed the various sensors using an ESP8266 microcontroller compatible with the Arduino Integrated Development Environment (IDE). The system uses a MAX30100 pulse oximeter and heart rate sensor, a GY-906 MLX90614 noncontact precision thermometer, a DHT11 humidity and temperature sensor, a MQ-135 gas and air quality sensor, and an AD8232 ECG sensor for collecting various parameters that may trigger asthma attacks. Finally, the system developed the Asthma Tracker app and the Asthma Tracker website for remote health monitoring. The system was initially tested on demo patients and later deployed and tested on seven real human test subjects. Overall, the monitoring system produced satisfactory results. The data acquired by the sensors has a high level of accuracy. The system also maintained user-friendliness and low cost.


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## Body

## 1. Introduction

Asthma is a type of respiratory disease. Asthma, Chronic Bronchitis, and Chronic Obstructive Pulmonary Disease (COPD) are respiratory disorders that affect the lungs and other areas of the respiratory system. Asthma causes breathing problems and can make physical activities challenging for people of all ages. Asthma is most commonly diagnosed in children, but it can also affect adults. It is thought to be a global health problem that affects 300 million people [1]. By 2025, it is expected that an additional 100 million individuals will suffer from asthma [2]. Moreover, asthma kills roughly one in every 250 people on the planet [3]. Researchers studied clinical data from patients using the Savana management clinical platform, using artificial intelligence and big data analysis, and discovered that from January 1 to May 10, 2020, 1006 (1.41 percent) of 71182 patients with asthma had COVID-19 [4]. Patients with COVID-19 and asthma, when compared to asthmatic individuals who did not have COVID-19, were significantly older. These patients also suffered from diabetes, obesity, and smoked more frequently. The World Health Organization (WHO) claims that in 2018 alone, asthma mortality in Bangladesh rose to 14,674, which is 1.89% of total deaths. The death rate is 13.27 per 100,000 of the population, putting Bangladesh at rank 32 [5]. COVID-19 patients with asthma are at a greater risk. This system was proposed since it requires regular monitoring. Asthma risk is determined by a complicated interplay of inherited and environmental variables. Genetic susceptibility, a family history of asthma, prenatal factors, low birth weight, allergen exposure, and respiratory infections, particularly those caused by the respiratory syncytial virus, are all risk factors. Environmental air pollution, tobacco smoke, food, and obesity are all risk factors [6]. As a matter of fact, there is only a little research on asthma epidemiology from Bangladesh. According to Bangladesh’s first national asthma prevalence study (NAPS), over 7 million individuals (5.2 percent) have asthma, with more than 90% of them not receiving current treatment [7]. The prevalence of asthma in the Indian subcontinent ranged from 4.3 to 6.9% [8].The world is moving toward a system where illnesses are detected in real time. Telehealth and mobile health are categorized as remote healthcare. The most important part of remote healthcare is the use of technology to monitor patients outside of hospital settings. There are many advantages of IoT-based health monitoring systems, such as continuous patient monitoring, real-time illness detection, reducing the need for and cost of hospitalization, utilization of technologies, emergency medical assistance, and finally obtaining more accurate data [9].In Bangladesh, among the total population (144.04 million, census done in 2011), 76.7 percent of people reside in rural areas, while 23.3 percent live in cities [10]. Because the majority of people reside in rural areas, they must travel vast distances to obtain contemporary healthcare services, which are costly and time consuming. Moreover, traveling long distances is very tedious in the context of Bangladesh. Every day, thousands of automobiles are visible on the road, causing traffic congestion. Patients in serious condition must sit in traffic for hours on end to get to the hospital. Patients have even died on the road as a result of traffic congestion. Asthma patients face a far more difficult condition. Moreover, rural areas are not developed. There are a few well-equipped hospitals, but these are costly for rural people. Furthermore, doctors are not willing to go and serve people in those rural areas. However, nearly every village has a fast Internet connection thanks to the Bangladesh government. This problem acted as motivation to propose this system that will be beneficial for these patients because they can use this real-time monitoring system to save themselves from asthma attacks, take their medicines regularly, and get advice from doctors from home. As for asthma patients, going outside may be critical for them. A patient’s surrounding environment may be harsh, which could trigger an asthma attack at any time. A remote patient monitoring system is essential in this day and age of advanced technology and high-speed Internet access.


### 1.1. Related Work

Abinayaa et al. [11] designed a monitoring device for asthmatics that is of low cost. This device includes an activity sensor, a gas sensor, a temperate sensor, and a humidity sensor. Depending on the sensed data, doctors can determine the patient’s condition. Orobah et al. [12] developed a system to assess the performance of detecting asthma attacks. The author used a support vector machine (SVM) classification system. When it comes to identifying cough signals, SVM classifiers outperform alternative methods such as the Hidden Markov Model (HMM), according to the author. Syed et al. [13] developed a cloud-assisted IoT-based healthcare monitoring system. The author described the process of acquiring respiration signals using sensors and transmitting the collected signal to a cloud server using the Internet. On the doctor's side, features such as breath rate/minute are extracted from the sent signal for the healthcare providers to analyze. Ping et al. [14] manufactured a spirometer that could measure flow rates between zero and fifteen liters per second with a four-milliliter per the second accuracy. Fasidi et al. [15] presented a wearable sensor device for detecting asthma attacks. Sensors monitor heart rate, air quality, humidity, and temperature, all of which have been linked to asthma attacks. In [15], the author attempted to establish a link between wearable devices, mobile devices, central storage, and stakeholders. Cheow et al. [16]developed an electronic kit for detecting asthma. The gadget measures the concentration of carbon dioxide in the patient’s exhaled air using an MH-Z14 A carbon dioxide (CO2) sensor. The device was tested on three (3) asthmatics and three (3) normal patients and the device produced differentiable patterns between asthmatic and normal patients. Debanik et al. [17] devised and built a gadget that collects health-related data such as heartbeat, temperature, dust, and humidity and uploads it to a cloud platform that clinicians can use to diagnose patients. Sharanu et al. [18] developed a wearable monitoring system for asthma patients. Researchers developed two (2) devices to continuously monitor a person suffering from bronchial asthma. The first device is the “Asthma Inhaler”. Features include medicine monitoring, smoke/gas/humidity/temperature detection, and total usage tracking, which allows the doctor to track how many times the device has been used. The second device is named the “Portable Device”. This device can monitor a patient’s temperature and heart rate. Finally, there is an emergency push button which notifies the location of the patient to emergency personnel.Niranjana et al. [19] developed a user-friendly asthma patient monitoring system to monitor the patient’s environment and provide precautions. Researchers used a gas sensor, humidity and temperature sensors, a heart rate sensor, and an Organic Light-Emitting Diode (OLED) to display all the information. The values obtained from the sensor are uploaded to the cloud. Researchers also developed an Android application. The main feature of the application is the asthma and trigger symptom test. Before consulting the doctor, the patient is asked some questions to test the symptoms of asthma. Shalini et al. [20] developed an asthma patient monitoring system using various sensors. Sensors sense the triggering attributes of an asthma attack and notify the patient using telegram notifications. Researchers used temperature, humidity, heart rate, air quality, and body temperature sensors. The values sensed by the sensor are stored on ThingSpeak, where data can be visualized using a graph. Doctors can study this graph and provide personalized suggestions. In [21], the authors presented an Android-based pulse monitoring system where the number of sensors was limited.The authors in [11–21] contributed to the field of remote healthcare by detecting asthma attacks using wearable devices, measuring the performance of detecting asthma attacks using classification algorithms, developing a cloud-assisted IoT-based healthcare monitoring system, and developing wearable devices. Although some papers have created Android apps, these apps do not provide patients with health information. Most of the apps do not require an account to log in to the system, which is a major security issue. Almost all the systems consist only of some sensors, mobile applications, and a third-party storage system. In all the papers, there is no way to communicate directly with doctors. This paper uses more sensors to accurately determine a patient’s condition. This paper presented an Android application in which patients have to create an account to use the system. By creating an account, a patient’s personal information is secured. Patients can also view their health information extracted from the sensors, which will help them take precautions. This paper also developed a web application where patients’ health information will be displayed. Doctors can also check a patient’s past records and write prescriptions. Finally, the web application has the feature of video calling and chatting, which enables a patient to talk with a doctor in real-time. This is how this paper’s novelty beats the state of the art. The major contribution of this paper is to present a system that combines IoT and telemedicine to develop a remote asthma patient monitoring system. Other papers lacked communication between doctor and patient. This paper has implemented an Android and Django application based-telemedicine service by providing facilities for video calling and chatting between the doctor and patient. Moreover, if the patient is unable to attend the video call, relatives of the patient can attend the call at the patient’s request. The developed system gives the patient the ability to self-monitor by displaying vital parameters on the Android application. The app allows the patient to send the acquired data if the patient thinks it is close to accurate. The website allows the doctor to prescribe a prescription based on the patient’s most recent report. The app was developed using Java, which is a powerful programming language. The website is developed using Django, which is a very popular and reliable web-based framework for web app development. Furthermore, this paper also developed an IoT-based health monitoring system. Patients can measure their SpO2, body temperature, heart rate, and ECG by using various sensors. This system also allows patients to measure volatile gases, humidity, and room temperature, as it is known that volatile gases, humidity, and even room temperature can trigger asthma attacks. The main advantages of using these sensors are that they are fairly cheap, small in size, and easy to use. This paper allows patients to monitor their electrocardiogram, room, and body temperature, which other IoT-based papers previously mentioned failed to do so. Ever since the COVID-19 pandemic disrupted the country’s economy, a huge rise in the demand for medical devices has increased along with their price. Poor people who are affected by asthma cannot bear the cost of these expensive devices. That is why this system tries to use very cheap but accurate and efficient sensors to monitor asthma patients.This paper presents the research and development of an IoT-based remote asthma patient health monitoring system. The introduction of the paper has been presented in Section1. Section 2 describes the materials and methods. Section 3 describes the result and analysis, and Section 4 provides the conclusion of the presented work.


## 1.1. Related Work

Abinayaa et al. [11] designed a monitoring device for asthmatics that is of low cost. This device includes an activity sensor, a gas sensor, a temperate sensor, and a humidity sensor. Depending on the sensed data, doctors can determine the patient’s condition. Orobah et al. [12] developed a system to assess the performance of detecting asthma attacks. The author used a support vector machine (SVM) classification system. When it comes to identifying cough signals, SVM classifiers outperform alternative methods such as the Hidden Markov Model (HMM), according to the author. Syed et al. [13] developed a cloud-assisted IoT-based healthcare monitoring system. The author described the process of acquiring respiration signals using sensors and transmitting the collected signal to a cloud server using the Internet. On the doctor's side, features such as breath rate/minute are extracted from the sent signal for the healthcare providers to analyze. Ping et al. [14] manufactured a spirometer that could measure flow rates between zero and fifteen liters per second with a four-milliliter per the second accuracy. Fasidi et al. [15] presented a wearable sensor device for detecting asthma attacks. Sensors monitor heart rate, air quality, humidity, and temperature, all of which have been linked to asthma attacks. In [15], the author attempted to establish a link between wearable devices, mobile devices, central storage, and stakeholders. Cheow et al. [16]developed an electronic kit for detecting asthma. The gadget measures the concentration of carbon dioxide in the patient’s exhaled air using an MH-Z14 A carbon dioxide (CO2) sensor. The device was tested on three (3) asthmatics and three (3) normal patients and the device produced differentiable patterns between asthmatic and normal patients. Debanik et al. [17] devised and built a gadget that collects health-related data such as heartbeat, temperature, dust, and humidity and uploads it to a cloud platform that clinicians can use to diagnose patients. Sharanu et al. [18] developed a wearable monitoring system for asthma patients. Researchers developed two (2) devices to continuously monitor a person suffering from bronchial asthma. The first device is the “Asthma Inhaler”. Features include medicine monitoring, smoke/gas/humidity/temperature detection, and total usage tracking, which allows the doctor to track how many times the device has been used. The second device is named the “Portable Device”. This device can monitor a patient’s temperature and heart rate. Finally, there is an emergency push button which notifies the location of the patient to emergency personnel.Niranjana et al. [19] developed a user-friendly asthma patient monitoring system to monitor the patient’s environment and provide precautions. Researchers used a gas sensor, humidity and temperature sensors, a heart rate sensor, and an Organic Light-Emitting Diode (OLED) to display all the information. The values obtained from the sensor are uploaded to the cloud. Researchers also developed an Android application. The main feature of the application is the asthma and trigger symptom test. Before consulting the doctor, the patient is asked some questions to test the symptoms of asthma. Shalini et al. [20] developed an asthma patient monitoring system using various sensors. Sensors sense the triggering attributes of an asthma attack and notify the patient using telegram notifications. Researchers used temperature, humidity, heart rate, air quality, and body temperature sensors. The values sensed by the sensor are stored on ThingSpeak, where data can be visualized using a graph. Doctors can study this graph and provide personalized suggestions. In [21], the authors presented an Android-based pulse monitoring system where the number of sensors was limited.The authors in [11–21] contributed to the field of remote healthcare by detecting asthma attacks using wearable devices, measuring the performance of detecting asthma attacks using classification algorithms, developing a cloud-assisted IoT-based healthcare monitoring system, and developing wearable devices. Although some papers have created Android apps, these apps do not provide patients with health information. Most of the apps do not require an account to log in to the system, which is a major security issue. Almost all the systems consist only of some sensors, mobile applications, and a third-party storage system. In all the papers, there is no way to communicate directly with doctors. This paper uses more sensors to accurately determine a patient’s condition. This paper presented an Android application in which patients have to create an account to use the system. By creating an account, a patient’s personal information is secured. Patients can also view their health information extracted from the sensors, which will help them take precautions. This paper also developed a web application where patients’ health information will be displayed. Doctors can also check a patient’s past records and write prescriptions. Finally, the web application has the feature of video calling and chatting, which enables a patient to talk with a doctor in real-time. This is how this paper’s novelty beats the state of the art. The major contribution of this paper is to present a system that combines IoT and telemedicine to develop a remote asthma patient monitoring system. Other papers lacked communication between doctor and patient. This paper has implemented an Android and Django application based-telemedicine service by providing facilities for video calling and chatting between the doctor and patient. Moreover, if the patient is unable to attend the video call, relatives of the patient can attend the call at the patient’s request. The developed system gives the patient the ability to self-monitor by displaying vital parameters on the Android application. The app allows the patient to send the acquired data if the patient thinks it is close to accurate. The website allows the doctor to prescribe a prescription based on the patient’s most recent report. The app was developed using Java, which is a powerful programming language. The website is developed using Django, which is a very popular and reliable web-based framework for web app development. Furthermore, this paper also developed an IoT-based health monitoring system. Patients can measure their SpO2, body temperature, heart rate, and ECG by using various sensors. This system also allows patients to measure volatile gases, humidity, and room temperature, as it is known that volatile gases, humidity, and even room temperature can trigger asthma attacks. The main advantages of using these sensors are that they are fairly cheap, small in size, and easy to use. This paper allows patients to monitor their electrocardiogram, room, and body temperature, which other IoT-based papers previously mentioned failed to do so. Ever since the COVID-19 pandemic disrupted the country’s economy, a huge rise in the demand for medical devices has increased along with their price. Poor people who are affected by asthma cannot bear the cost of these expensive devices. That is why this system tries to use very cheap but accurate and efficient sensors to monitor asthma patients.This paper presents the research and development of an IoT-based remote asthma patient health monitoring system. The introduction of the paper has been presented in Section1. Section 2 describes the materials and methods. Section 3 describes the result and analysis, and Section 4 provides the conclusion of the presented work.


## 2. Materials and Methods

### 2.1. Introduction

This section contains the following information: all materials and methods, including architectural patterns, system architecture, and a use case diagram for constructing the system, are discussed.


### 2.2. App and Web-Based System

The paper presents an app and a website that will, in general, state all applications of remote patient monitoring. Various features of the app are patient registration, log-in using e-mail and password, viewing and updating patients’ information, and viewing and uploading health-related information to the database. The features of the website are a doctor and patient registration and log-in, patient’s report viewing by the doctor, prescribing prescription, and video chatting and calling between the doctor and patient.


### 2.3. Block Diagram

The block diagram of the entire system is shown in Figure1. The system is divided into three parts: a hardware part consisting of various sensors, an Android application, and a website. The heart rate and SpO2 sensors, as well as body temperature, ECG, humidity, room temperature, and air quality sensors, are all connected to the system’s hardware. An asthma patient’s heart rate, SpO2, body temperature, and ECG are all important metrics to monitor. Because external factors like room temperature, humidity, and air quality can trigger asthma episodes at any time, this paper has also integrated these sensors. Sensed data is transferred and displayed on an Android application. The Android app works as a bridge between the hardware part and the website. The Android application is connected to the Firebase Database where the health-related data is stored. On the website, that data is again displayed for patient monitoring. Doctors can view this data as reports from the patients. After the examination, doctors can provide the necessary feedback by prescribing prescriptions. If a patient needs to speak with a doctor in real-time without coming to the hospital, video calling is an option.Figure 1
The entire system is depicted as a block diagram.


### 2.4. ER Diagram

The Entity Relationship (ER) diagram of the complete system is shown in Figure2. The system has two users and an admin panel. The users include patients, doctors, receptionists, and human resources (HR). A patient can manage only one account. Hence, the relationship between patient and profile is one-to-one. A patient can measure heart rate, SpO2, body temperature, humidity, and volatile gases as long as the patient is not satisfied with the result. That is why the relationships between patients and vital signs are one-to-many. A patient can subscribe to one doctor at a time, and a doctor can monitor different patients at a time. Hence, the relationship between patient and doctor is many-to-one. The receptionist manages interactions between patients and doctors. The receptionist adds new patients into the system and creates appointments so that a doctor can monitor the patient. The human resources (HR) staff are responsible for the doctor. The HR department has the ability to track all the active doctors in the system and is responsible for the doctors’ remuneration. The entire system is overseen by an admin panel.Figure 2
ER diagram of the entire system.


### 2.5. Use Case Diagram and Analysis

Use Case Analysis (UCA) is a process for identifying a system’s needs as well as the responsibilities and relationships between distinct classes that will be represented in the use case diagram.


#### 2.5.1. Use Case for Patients

The system allows patients to create an account. The patient is required to provide basic information such as full name, password, phone number, age, weight, ethnicity, and e-mail. A patient can log in to the Android app using their e-mail and password after creating an account. The patient has the ability to take data using various sensors via Wi-Fi and store the data in the Firebase Real-time Database. The patient can also log in to the website to view reports and initiate a video call with the doctor, as shown in Figure3.Figure 3
Use case diagram of the entire system.


#### 2.5.2. Use Case for Doctors

Doctors have to go through a more rigorous process of registration. A doctor must be a registered member of the doctor’s database of the Bangladesh Medical and Dental Council (BM&DC) [22]. The name and the identification (ID) number from BM&DC must be used to register as a doctor along with other important information such as e-mail, password, chamber, degree, and visiting hours. The doctor can also initiate a video call with the patient, as shown in Figure 3.


#### 2.5.3. Use Case for Admin

The admins in the system or on the website will be registered as super users. Admins have a dashboard where all pending registration requests reside. For a patient’s registration, the admin can just accept the request because anyone can be a patient, but to accept a doctor’s registration request, the admin must manually visit BM&DC and check the doctor’s ID and name and whether the data exists in the database. If the doctor’s credentials match, then the admin can approve the doctor’s registration. The admin is also capable of editing, deleting, or creating new users from the dashboard, as shown in Figure3.


### 2.6. Architecture of the Android Application

The app is built with Java in the Android Studio. The front-end of the app is written in XML format. The frontend directly talks with the backend, which is written in Java. The app is integrated with the Firebase SDK, which allows the app to store data in the Firebase Real-time Database. The Firebase Software Development Kit (SDK) also allows the app to have authenticated users by providing authentication using e-mail and passwords. Users with valid accounts may enter the system. Once the patient extracts health information using the hardware device, that data will be stored in the real-time database with other basic pieces of information about the patient.


#### 2.6.1. Module

A module is a grouping of source files and build options. One or more modules can be included in a project. Furthermore, by declaring dependencies, one module can use another module. According to [23], “Modules help to break down a project into manageable chunks.”


#### 2.6.2. Layouts

User interface structures are defined by layouts. Components in the layout are built on the hierarchical structure of views and view groups. A view is responsible for presenting something the user can interact with. On the other hand, a view group is a hidden container that determines the view’s layout structure [24].


### 2.7. Architecture of the Website

The website is built usingPython. Django follows the Model View Template (MVT) software architecture pattern for developing web applications. A detailed description of the architectural pattern is given below.


#### 2.7.1. Model

The model is the interface of the website. It is responsible for the coordination and maintaining data. The model holds the logical data structure which works in the application backend. The model also uses a database that represents the relational database in general.


#### 2.7.2. View

The view works as the User Interface (UI) of the web application. The main job of the view is to render everything when a user browses the website. The view is represented by HTML, CSS, and JavaScript (JS).


#### 2.7.3. Template

Static parts of the frontend HTML files are members of the template. Besides HTML files, there is some syntax that helps to describe how dynamic content is inserted [25].


#### 2.7.4. Frontend Tools

The website uses an HTML5 template as its frontend. This template was later integrated into the Asthma Tracker website. The website uses HTML, CSS, JavaScript, and jQuery in its frontend. HTML is a scripting language. It is used to provide a skeleton for the entire website. Users have the ability to create and structure their own web applications with the help of different tags. CSS is used to give the website a sense of life. JavaScript is a programming language that specifies the functionality of each button. JQuery is a JavaScript library. The purpose of jQuery is to support JavaScript, making it easier to use.


#### 2.7.5. Backend Tools

To make the website dynamic, backend tools were used. The backend allows the website to perform various tasks. It also structures all the web pages and presents these pages on the website where data can be read, sent, and updated. The website is built usingPython with the help of the Django framework. Django was chosen for its efficiency and unparalleled scalability. Django uses its inbuilt SQLite relational database to structure and store data. For video calling, WebRTC technology and the PeerJS library were used, and for video chatting, Node.js and Socket.IO were used.


### 2.8. Hardware Tools

The cost of the components needed to build the system is broken down in Table1. The system was moderately assembled, costing Tk. 5307, which is about 63 USD (United States Dollars) when converted. Components’ names, model numbers, prices in USD, and prices in BDT (Bangladeshi Taka) are all recorded in Table 1. As illustrated in Table 1, the system is developed and built at a low and economical cost. The system’s overall cost is around Taka (Tk.) 5307, which is less than 63 dollars, making the system’s implementation inexpensive and the design creative because the system is primarily software-based. The components that were used to construct the monitoring system are described in Table 2.Table 1
Cost of the components.
Sl no.Component nameModel numberQuantityCost/Unit (USD)Cost/Unit (BDT)1Heart rate and pulse oximeterMAX30100111.09942.652IF noncontact precision thermometerMLX90614112.8010883Temperature and humidity sensorDHT1116.35539.754Gas and air quality sensorMQ-13512.24190.405ECG sensorAD8232119.951695.756MicrocontrollerNodeMCU ESP8266110850Total cost:63(approx.)5307 (approx.)Table 2
Description of the components.
ComponentsDescriptionMAX30100The MAX30100 is a sensor that includes a pulse oximeter and a heart rate monitor. It can operate from 1.8 to 3.3 V (volts). The sensor has a high sample rate and fast data output capability.MLX90614The MLX90614 is an infrared thermometer that measures temperature without touching it. It is a little device that’s simple to incorporate with high precision.DHT11The DHT11 is a low-cost temperature and humidity sensor for rooms. An inbuilt humidity sensor is present inside the sensor. It also has an inbuilt thermometer.MQ-135MQ-135 is a gas sensor which can monitor air quality. The sensor can detect/measure ammonia, smoke, CO2, alcohol, benzene, etc.AD8232The AD8232 is an ECG signal conditioning block with integrated signal conditioning. It can extract, amplify, and filter tiny biopotential signals.NodeMCU ESP8266This is the brain of the hardware part. The microcontroller is used for extracting data from the patient and sending that data to the Firebase Database via Wi-Fi. The device has an inbuilt Wi-Fi module for data transferring. It is also used for visualization in the Arduino IDE [26].


## 2.1. Introduction

This section contains the following information: all materials and methods, including architectural patterns, system architecture, and a use case diagram for constructing the system, are discussed.


## 2.2. App and Web-Based System

The paper presents an app and a website that will, in general, state all applications of remote patient monitoring. Various features of the app are patient registration, log-in using e-mail and password, viewing and updating patients’ information, and viewing and uploading health-related information to the database. The features of the website are a doctor and patient registration and log-in, patient’s report viewing by the doctor, prescribing prescription, and video chatting and calling between the doctor and patient.


## 2.3. Block Diagram

The block diagram of the entire system is shown in Figure1. The system is divided into three parts: a hardware part consisting of various sensors, an Android application, and a website. The heart rate and SpO2 sensors, as well as body temperature, ECG, humidity, room temperature, and air quality sensors, are all connected to the system’s hardware. An asthma patient’s heart rate, SpO2, body temperature, and ECG are all important metrics to monitor. Because external factors like room temperature, humidity, and air quality can trigger asthma episodes at any time, this paper has also integrated these sensors. Sensed data is transferred and displayed on an Android application. The Android app works as a bridge between the hardware part and the website. The Android application is connected to the Firebase Database where the health-related data is stored. On the website, that data is again displayed for patient monitoring. Doctors can view this data as reports from the patients. After the examination, doctors can provide the necessary feedback by prescribing prescriptions. If a patient needs to speak with a doctor in real-time without coming to the hospital, video calling is an option.Figure 1
The entire system is depicted as a block diagram.


## 2.4. ER Diagram

The Entity Relationship (ER) diagram of the complete system is shown in Figure2. The system has two users and an admin panel. The users include patients, doctors, receptionists, and human resources (HR). A patient can manage only one account. Hence, the relationship between patient and profile is one-to-one. A patient can measure heart rate, SpO2, body temperature, humidity, and volatile gases as long as the patient is not satisfied with the result. That is why the relationships between patients and vital signs are one-to-many. A patient can subscribe to one doctor at a time, and a doctor can monitor different patients at a time. Hence, the relationship between patient and doctor is many-to-one. The receptionist manages interactions between patients and doctors. The receptionist adds new patients into the system and creates appointments so that a doctor can monitor the patient. The human resources (HR) staff are responsible for the doctor. The HR department has the ability to track all the active doctors in the system and is responsible for the doctors’ remuneration. The entire system is overseen by an admin panel.Figure 2
ER diagram of the entire system.


## 2.5. Use Case Diagram and Analysis

Use Case Analysis (UCA) is a process for identifying a system’s needs as well as the responsibilities and relationships between distinct classes that will be represented in the use case diagram.


### 2.5.1. Use Case for Patients

The system allows patients to create an account. The patient is required to provide basic information such as full name, password, phone number, age, weight, ethnicity, and e-mail. A patient can log in to the Android app using their e-mail and password after creating an account. The patient has the ability to take data using various sensors via Wi-Fi and store the data in the Firebase Real-time Database. The patient can also log in to the website to view reports and initiate a video call with the doctor, as shown in Figure3.Figure 3
Use case diagram of the entire system.


### 2.5.2. Use Case for Doctors

Doctors have to go through a more rigorous process of registration. A doctor must be a registered member of the doctor’s database of the Bangladesh Medical and Dental Council (BM&DC) [22]. The name and the identification (ID) number from BM&DC must be used to register as a doctor along with other important information such as e-mail, password, chamber, degree, and visiting hours. The doctor can also initiate a video call with the patient, as shown in Figure 3.


### 2.5.3. Use Case for Admin

The admins in the system or on the website will be registered as super users. Admins have a dashboard where all pending registration requests reside. For a patient’s registration, the admin can just accept the request because anyone can be a patient, but to accept a doctor’s registration request, the admin must manually visit BM&DC and check the doctor’s ID and name and whether the data exists in the database. If the doctor’s credentials match, then the admin can approve the doctor’s registration. The admin is also capable of editing, deleting, or creating new users from the dashboard, as shown in Figure3.


## 2.5.1. Use Case for Patients

The system allows patients to create an account. The patient is required to provide basic information such as full name, password, phone number, age, weight, ethnicity, and e-mail. A patient can log in to the Android app using their e-mail and password after creating an account. The patient has the ability to take data using various sensors via Wi-Fi and store the data in the Firebase Real-time Database. The patient can also log in to the website to view reports and initiate a video call with the doctor, as shown in Figure3.Figure 3
Use case diagram of the entire system.


## 2.5.2. Use Case for Doctors

Doctors have to go through a more rigorous process of registration. A doctor must be a registered member of the doctor’s database of the Bangladesh Medical and Dental Council (BM&DC) [22]. The name and the identification (ID) number from BM&DC must be used to register as a doctor along with other important information such as e-mail, password, chamber, degree, and visiting hours. The doctor can also initiate a video call with the patient, as shown in Figure 3.


## 2.5.3. Use Case for Admin

The admins in the system or on the website will be registered as super users. Admins have a dashboard where all pending registration requests reside. For a patient’s registration, the admin can just accept the request because anyone can be a patient, but to accept a doctor’s registration request, the admin must manually visit BM&DC and check the doctor’s ID and name and whether the data exists in the database. If the doctor’s credentials match, then the admin can approve the doctor’s registration. The admin is also capable of editing, deleting, or creating new users from the dashboard, as shown in Figure3.


## 2.6. Architecture of the Android Application

The app is built with Java in the Android Studio. The front-end of the app is written in XML format. The frontend directly talks with the backend, which is written in Java. The app is integrated with the Firebase SDK, which allows the app to store data in the Firebase Real-time Database. The Firebase Software Development Kit (SDK) also allows the app to have authenticated users by providing authentication using e-mail and passwords. Users with valid accounts may enter the system. Once the patient extracts health information using the hardware device, that data will be stored in the real-time database with other basic pieces of information about the patient.


### 2.6.1. Module

A module is a grouping of source files and build options. One or more modules can be included in a project. Furthermore, by declaring dependencies, one module can use another module. According to [23], “Modules help to break down a project into manageable chunks.”


### 2.6.2. Layouts

User interface structures are defined by layouts. Components in the layout are built on the hierarchical structure of views and view groups. A view is responsible for presenting something the user can interact with. On the other hand, a view group is a hidden container that determines the view’s layout structure [24].


## 2.6.1. Module

A module is a grouping of source files and build options. One or more modules can be included in a project. Furthermore, by declaring dependencies, one module can use another module. According to [23], “Modules help to break down a project into manageable chunks.”


## 2.6.2. Layouts

User interface structures are defined by layouts. Components in the layout are built on the hierarchical structure of views and view groups. A view is responsible for presenting something the user can interact with. On the other hand, a view group is a hidden container that determines the view’s layout structure [24].


## 2.7. Architecture of the Website

The website is built usingPython. Django follows the Model View Template (MVT) software architecture pattern for developing web applications. A detailed description of the architectural pattern is given below.


### 2.7.1. Model

The model is the interface of the website. It is responsible for the coordination and maintaining data. The model holds the logical data structure which works in the application backend. The model also uses a database that represents the relational database in general.


### 2.7.2. View

The view works as the User Interface (UI) of the web application. The main job of the view is to render everything when a user browses the website. The view is represented by HTML, CSS, and JavaScript (JS).


### 2.7.3. Template

Static parts of the frontend HTML files are members of the template. Besides HTML files, there is some syntax that helps to describe how dynamic content is inserted [25].


### 2.7.4. Frontend Tools

The website uses an HTML5 template as its frontend. This template was later integrated into the Asthma Tracker website. The website uses HTML, CSS, JavaScript, and jQuery in its frontend. HTML is a scripting language. It is used to provide a skeleton for the entire website. Users have the ability to create and structure their own web applications with the help of different tags. CSS is used to give the website a sense of life. JavaScript is a programming language that specifies the functionality of each button. JQuery is a JavaScript library. The purpose of jQuery is to support JavaScript, making it easier to use.


### 2.7.5. Backend Tools

To make the website dynamic, backend tools were used. The backend allows the website to perform various tasks. It also structures all the web pages and presents these pages on the website where data can be read, sent, and updated. The website is built usingPython with the help of the Django framework. Django was chosen for its efficiency and unparalleled scalability. Django uses its inbuilt SQLite relational database to structure and store data. For video calling, WebRTC technology and the PeerJS library were used, and for video chatting, Node.js and Socket.IO were used.


## 2.7.1. Model

The model is the interface of the website. It is responsible for the coordination and maintaining data. The model holds the logical data structure which works in the application backend. The model also uses a database that represents the relational database in general.


## 2.7.2. View

The view works as the User Interface (UI) of the web application. The main job of the view is to render everything when a user browses the website. The view is represented by HTML, CSS, and JavaScript (JS).


## 2.7.3. Template

Static parts of the frontend HTML files are members of the template. Besides HTML files, there is some syntax that helps to describe how dynamic content is inserted [25].


## 2.7.4. Frontend Tools

The website uses an HTML5 template as its frontend. This template was later integrated into the Asthma Tracker website. The website uses HTML, CSS, JavaScript, and jQuery in its frontend. HTML is a scripting language. It is used to provide a skeleton for the entire website. Users have the ability to create and structure their own web applications with the help of different tags. CSS is used to give the website a sense of life. JavaScript is a programming language that specifies the functionality of each button. JQuery is a JavaScript library. The purpose of jQuery is to support JavaScript, making it easier to use.


## 2.7.5. Backend Tools

To make the website dynamic, backend tools were used. The backend allows the website to perform various tasks. It also structures all the web pages and presents these pages on the website where data can be read, sent, and updated. The website is built usingPython with the help of the Django framework. Django was chosen for its efficiency and unparalleled scalability. Django uses its inbuilt SQLite relational database to structure and store data. For video calling, WebRTC technology and the PeerJS library were used, and for video chatting, Node.js and Socket.IO were used.


## 2.8. Hardware Tools

The cost of the components needed to build the system is broken down in Table1. The system was moderately assembled, costing Tk. 5307, which is about 63 USD (United States Dollars) when converted. Components’ names, model numbers, prices in USD, and prices in BDT (Bangladeshi Taka) are all recorded in Table 1. As illustrated in Table 1, the system is developed and built at a low and economical cost. The system’s overall cost is around Taka (Tk.) 5307, which is less than 63 dollars, making the system’s implementation inexpensive and the design creative because the system is primarily software-based. The components that were used to construct the monitoring system are described in Table 2.Table 1
Cost of the components.
Sl no.Component nameModel numberQuantityCost/Unit (USD)Cost/Unit (BDT)1Heart rate and pulse oximeterMAX30100111.09942.652IF noncontact precision thermometerMLX90614112.8010883Temperature and humidity sensorDHT1116.35539.754Gas and air quality sensorMQ-13512.24190.405ECG sensorAD8232119.951695.756MicrocontrollerNodeMCU ESP8266110850Total cost:63(approx.)5307 (approx.)Table 2
Description of the components.
ComponentsDescriptionMAX30100The MAX30100 is a sensor that includes a pulse oximeter and a heart rate monitor. It can operate from 1.8 to 3.3 V (volts). The sensor has a high sample rate and fast data output capability.MLX90614The MLX90614 is an infrared thermometer that measures temperature without touching it. It is a little device that’s simple to incorporate with high precision.DHT11The DHT11 is a low-cost temperature and humidity sensor for rooms. An inbuilt humidity sensor is present inside the sensor. It also has an inbuilt thermometer.MQ-135MQ-135 is a gas sensor which can monitor air quality. The sensor can detect/measure ammonia, smoke, CO2, alcohol, benzene, etc.AD8232The AD8232 is an ECG signal conditioning block with integrated signal conditioning. It can extract, amplify, and filter tiny biopotential signals.NodeMCU ESP8266This is the brain of the hardware part. The microcontroller is used for extracting data from the patient and sending that data to the Firebase Database via Wi-Fi. The device has an inbuilt Wi-Fi module for data transferring. It is also used for visualization in the Arduino IDE [26].


## 3. Result and Analysis

Figure4 shows the prototype integration block diagram of the sensors used in the system. The hardware system consists of a microcontroller (NodeMCU ESP8266), MAX30100, MLX90614, DHT11, MQ-135, and AD8232 ECG sensors. Jumper wires connect all of the sensors to the microcontroller. The microcontroller is powered by a laptop or power bank as a power supply. Only the MQ-135 needs a 5V power supply; the rest of the sensors only need a 3V power supply. Figure 5 shows the actual prototype. The NodeMCU ESP8266 is best suited for IoT-based applications. The ESP8266 Wi-Fi is used to run the microcontroller’s firmware. The ESP-12 module serves as the basis for the hardware. The most important feature of NodeMCU is that it supports I2C functionality. If data is sent bit by bit along a specific wire, then that serial communication is known as I2C. I2C can be explained by two terms: Serial Data (SDA) and Serial Clock (SCL). SDA is the data transfer or reception line between the master and slave. The SCL carries the clock pulse. As I2C is synchronous, the output bits and sampling bits are synchronized by a clock pulse. The D1 and D2 pins on the NodeMCU support SCL and SDA communication, respectively. Both the MAX30100 pulse oximeter and heart rate sensor and the MLX9014 noncontact infrared thermometer’s SCL and SDA pins are connected to the D1 and D2 pins of the NodeMCU. A continuous 3.3 V power supply is supplied to NodeMCU to power up both sensors. The LO-and LO + pins of the AD8232 are connected to D5 and D6 of the NodeMCU. The AD8232 is also powered by 3.3 V. The DOUT pin of the DHT11 and the A0 pin of the MQ-135 are connected to D4 and the A0 pin of the NodeMCU, respectively.Figure 4
Block diagram of various sensors connected with a microcontroller.Figure 5
Prototype of various sensors connected with a microcontroller.Figure6 shows the MAX30100 pulse oximeter and heart rate sensor being tested on the human body. As shown in the figure, patients need to place their hands on top of the pulse sensor. The MAX30100 has a red Light-Emitting Diode (LED) indicating it is ready to take data. To get accurate data, the patient needs to sit still for 1-2 minutes and take deep breaths. Figure 7 shows the MAX30100 sensor test results. Figure 8 shows the AD8232 ECG sensor being tested on the human body. Figure 9 shows the AD8232 ECG sensor test result. The ECG sensor has 3 electrodes: red, green, and yellow. The green electrode is placed right on the heart of the patient, while the red electrode is placed opposite of the red electrode. The yellow electrode is placed just under the ribcage of the patient’s body. Figure 10 shows the MLX90614 noncontact precision thermometer sensor being tested on the human body. The MLX90614 sensor test result is presented in Figure 11. Figure 12 shows the MQ-135 gas and air quality sensor testing. The MQ-135 gas and air quality sensor test results are presented in Figure 13. Figure 14 shows the DHT11 humidity and room temperature sensor testing in the environment. The DHT11 humidity and room temperature sensor test results are shown in Figure 15. Sensors gather data from the patient’s body and the outside environment (air quality, room temperature, and humidity), transmitting data via Wi-Fi. Data is first stored in the Firebase Database, and from there, it goes to the app of a particular patient. If the patient is satisfied with the accuracy of the data, then this data will be sent and stored in the MySQL database of the website. From there, the data will be queried and displayed for the doctor to conduct remote monitoring.Figure 6
MAX30100 sensor testing on the human body.Figure 7
MAX30100 sensor test results.Figure 8
AD8232 ECG sensor testing on the human body.Figure 9
AD8232 ECG sensor test result.Figure 10
MLX90614 sensor testing on the human body.Figure 11
MLX90614 sensor test results.Figure 12
Testing the MQ-135 gas and air quality sensor.Figure 13
MQ-135 gas and air quality sensor test results.Figure 14
Testing the DHT11 humidity and room temperature sensor.Figure 15
DHT11 humidity and room temperature sensor test results.Table3 presents the comparison between ideal values of different parameters and the values this system has registered. The ideal SpO2 value of a resting adult is between 97–100%, but in this experiment setup, it is found to be 98%, which is very good. The normal resting heart rate of an adult is between 66 and 69 beats per minute, which may vary depending on age, health condition, gender, and other factors. In this study, using the proposed developed system, it was observed to be 71.05 bpm, which is very good. The ideal body temperature for a human is 97.6°F. When the measurement was taken using this proposed system, the temperature value was noticed to be 97.6 °F as well, which is similar to the ideal temperature value of the human body. The system registered the humidity at a bit higher than the ideal value. The room temperature is close to the ideal value. The system lacked the ability to measure the perfect air quality. Air quality between 0 and 50 parts per million (ppm) is considered good, but the system measured 204 to 305 ppm. The cause of this variation may be because of the room’s air quality where the system was tested.Table 3
Comparison of different parameters against ideal values.
Sl no.ParametersIdeal valuesValues of this system1SpO299–100%98%2Heart rate66–69 bpm71.05 bpm3Body temperature97.6°F97.92°F4Humidity30–50%49–58%5Room temperature25–29°C25–30°C6Air quality0–50 ppm204–305 ppmThis paper presents tests on the accuracy of the MAX30100 blood oxygen saturation and heart rate sensors and the MLX90614 noncontact precision thermometer by carrying out as many as 7 tests on patients of different ages. The obtained results are then compared with an industry-standard device (Jumper Fingertip Pulse Oximeter Blood Level Monitor/JPD-500E) to obtain the percentage error of the device. The test for blood oxygen saturation detection accuracy shows that the percentage error on average is 1.02%. A high error means lower accuracy. This implies that the accuracy of the sensor that this paper represents is almost as good as or sometimes better than the values shown on the JPD-500E. Looking at the values obtained from MAX30100, it can also be assured that the sensor is performing at a stable rate and providing accurate measurements for different patients. The MAX30100 can also measure our heart rate. Test results for heart rate detection show that the percentage error on average is 3.03. This paper accepts values from JPD-500E as truth. Since almost every industrial medical device has the same level of accuracy, although a higher percentage of error means lower accuracy, the average human heart rate is 60–100 beats per minute, and it varies from minute to minute. During exercise, the heart rate can be anywhere between 130 and 150 beats per minute. So, there is no hard and fast rule of what a person’s heart rate should be. Looking at the values obtained from MAX30100, we can say that it is giving values almost close to JPD-500E. This paper has tested the MAX90614 with a generic thermometer. The typical body temperature for an adult is between 97°F and 99°F (or 36.1°C and 37.2°C). Since people measure temperatures in Fahrenheit, we have also taken Fahrenheit measurements. Test results show that MLX90614’s percentage error is on average 0.51%. As normal body temperature remains the same in people of all ages, we can imply that the MLX90-614’s temperature detection accuracy is satisfactory, and we observed steady performance as shown in Table4.Table 4
Comparison against JPD-500E.
Name and ageMAX30100 (SpO2)M (%)AX30100 (bpm)MLX90614 (°F)JPD-500e (SpO2)J (%)PD-500E (bpm)JPD-500e (°F)Pranti (18)999397.5°F1009598°FAnan (23)999998°F989798.5°FZubayer (27)9710297.5°F9610797°FNoble Ali (28)9871.0597.92997998°FNisho (35)10010698.5°F10010999°FFahim (38)999198°F978997°FFarhana (61)1009698°F999298°FFigure16 shows the landing and registration page of the Android app. A patient must fill out the form to create an account. The patient needs to provide basic information such as full name, e-mail, phone number, age, and weight. There are some requirements that need to be met when registering as a patient. The patient must provide a valid e-mail address and a password with a length of at least six characters. The phone number of the patient must be at least 11 characters and must start with “01”. The e-mail and password are required for log-in purposes. A patient can click on “Log-in Here” to go to the log-in page if they have already created an account.Figure 16
Asthma tracker app registration page.Figure17 shows the log-in screen for the application. A patient needs to provide an appropriate e-mail and password to log in to the system. If the patient does not have an account, the patient can click the “Register Here” link. The link will redirect the patient to the registration page, where they can create a new account.Figure 17
Asthma tracker app login page.Figure18 shows the homepage with the collapsible navigation panel. The navigation panel has a button for going back to the homepage, which will redirect to the starting page of the app. Patients can also view patients’ information by clicking on the “Profile” button. There, patients can view their basic information such as name, weight, age, and phone number. The “health information” button will redirect the patient to a page where they can connect to various sensors via Wi-Fi and extract health information from those sensors. This is the main feature of the Asthma Tracker app. The whole purpose of developing this app is to build bridges between doctors and patients. Patients can get accurate health-related information such as SpO2, heart rate, temperature, humidity, air quality, and room temperature from the hardware device and send and store this data in a secured database. The “ECG” button will take the patient to another page where they can see the ECG graph. Finally, there is a button for logging out of the application.Figure 18
Asthma tracker app navigation panel.Figure19 shows the Asthma Tracker health information page. On this page, patients have to provide health-related information. There are seven different parameters: heart rate, SpO2, body temperature, electrocardiogram (ECG), humidity, air quality, and room temperature. The number of beats per minute produced by the heart is referred to as the heart rate. SpO2 is the oxygen saturation in a person’s blood. Body temperature means the system is measuring a patient’s body temperature. For asthma patients, the environment in which they live is also very important. Frequent asthma attacks could be caused by external factors. A patient’s room temperature may be unbearable, or the air quality might be causing breathing problems. With the help of a DHT11 sensor, the system can measure the room humidity and temperature level in the patient’s environment. There could be various harmful gases in the environment, such as hydrogen nitride (NH3), carbon monoxide (CO), nitrogen dioxide (NO2), and smoke. That is why the system will measure the air quality to ensure the patient is not suffering from any breathing problems. This data will be acquired by sensors that will be transferred via Wi-Fi. After pressing the “GET DATA” button, the app will automatically display all the health information. To send this data to the doctor for remote monitoring, patients just need to press the “SUBMIT” button. These data will then be stored in the Firebase Database, from where these data will be queried and displayed to the doctor. Figure 20 shows the electrocardiogram (ECG) page of the app. The ECG graph is transferred from the Arduino IDE and displayed in the app. If the patient is satisfied with the graph, it can be transferred to the Firebase Database, from where it will be displayed on the website.Figure 19
Asthma tracker health information page.Figure 20
Electrocardiogram graph.Figure21 shows the landing page of the website. This page is visible to anyone. The home page contains basic information about the service this website provides. The service includes patient monitoring, telemedicine, and online prescriptions. On clicking the “About” button, the user is taken to a new web page where additional information from the system administrator is provided. Important contact information is provided on the “Contact” page.Figure 21
Landing page of the website.In the top right corner, there are buttons for registration and login. On the registration page, users first choose their roles. Users can register either as doctors or patients. To register, users must provide information such as their full name, username, e-mail, phone number, age, and password. While registering, doctors must provide BMDC numbers for authentication. Without a BMDC number, doctors will not be allowed to enter the system. After successful registration, the user will be redirected to the home page. Similar to the doctor’s homepage, the patient’s homepage also contains a link to update profile information. Patients can view their medical history or prescriptions from the “Medical History” page. There is also an option to view the prescription in a portable document format (pdf). Patients can view their current health condition from the “Report” page where health information such as spO2, body temperature, and heart rate values of the patient will be displayed. This information is gathered from the Asthma Tracker app. The information is stored in the Firebase Database. Patients can also see if they have an appointment with one or more of our registered doctors on the “Your Appointments” page. Finally, similar to the doctor’s homepage, patients can also engage themselves in a video call with a doctor. Patients must share their unique ID in the chatbox so that a doctor can establish a connection to make a video call. Similar to the doctor’s homepage, the patient’s homepage also contains a link to update profile information. Patients can view their medical history or prescriptions from the “Medical History” page. There is also an option to view the prescription in a portable document format (pdf). Patients can view their current health condition from the “Report” page where health information such as SpO2, heart rate, body temperature, room temperature, air quality, and temperature as well as humidity values of the patient will be displayed. This information is gathered from the Asthma Tracker app. The information is stored in the Firebase Database. Patients can also see if they have an appointment with one or more of our registered doctors on the “Your Appointments” page. Finally, similar to the doctor’s homepage, patients can also engage themselves in a video call with a doctor. Patients must share their unique ID in the chatbox so that a doctor can establish a connection to make a video call as shown in Figure22.Figure 22
Registration page.Figure23 shows the log-in page of the website. To obtain access to the system, a user must first register and then submit a valid username and password. In addition, the patient must supply a valid e-mail address. To access the system, receptionists and HR department employees must also enter their username and password.Figure 23
Log-in page.Figure24 shows the receptionist’s dashboard. A system administrator can create an account for the receptionist. Once logged in, the receptionist will be presented with a list of ongoing appointments and admitted patients. The receptionist will be able to create appointments between the doctor and the patient. To create an appointment, the receptionist must select a date and time, along with the names of the patient and doctor. A receptionist can also check the total number of appointments, the number of completed appointments, and the number of upcoming appointments. A receptionist can also update personal information and delete any patient in the system.Figure 24
Receptionist’s dashboard.Figure25 shows the HR homepage. Similar to the receptionist, a system administrator can create an account for the HR department of the system. The HR department is responsible for maintaining doctors in the system. On the “Dashboard” page, HR staff can register new doctors in the system. HR staff can also view the total number of doctors, the number of admitted patients, and the number of on-duty doctors in the system. HR staff can also update basic information and remove a doctor from the system. The “Accounting” page is for tracking patients’ bills for services doctors provide to them.Figure 25
HR dashboard.Figure26 shows the admin panel of the website. An admin has the opportunity to view all other admins, doctors, patients, receptionists, and staff in the HR department. Doctors’ registration verification is done here. The admin has the ability to manually create, read, update, and delete any user as well. There are two separate tables for doctors and patients in the admin panel. An admin has the privilege of viewing and updating each table.Figure 26
Asthma tracker website admin panel.Figure27 shows the patient’s health information presented to the doctor. To view a patient’s report, first of all, an appointment must be created between the doctor and patient. On the appointments page, a doctor can view all the due appointments with the option of viewing the medical report of the patient who has an appointment with the doctor. The doctor can view basic information such as the name, age, sex, weight, and blood group of the patient along with the medical report. After deciding on the patient’s condition upon viewing the report, doctors can take appropriate action. That is, prescribing a prescription that a patient can download as a PDF file for further reference. In Figure 27, this paper showed an example of what a doctor would see. Here, the doctor will know the patient’s name as Noble Ali, a 28-year-old man who has a blood group of O+ and weighs 67.5 kg. As presented in Figure 27, we can see that the patient has an oxygen saturation of 98%. The patient’s heart rate is 71.05 beats per minute (BPM). We can also see that the patient’s body temperature is 97.92 degrees Fahrenheit. The patient’s surrounding humidity is at 50% and the room temperature is at 30.00 degrees Celsius. The air quality of the patient’s environment is 204 parts per million (PPM).Figure 27
Patient’s health information presentation.Figure28 shows the doctor’s prescription. After checking a patient’s report, a doctor can prescribe a prescription for the patient. A doctor has to write down the symptoms of the patient. After that, the doctor has to write the actual prescription. A doctor can only prescribe a prescription to a patient for whom he or she has an appointment.Figure 28
Doctor’s prescription.Figure29 shows the medical history. After checking a patient’s report, a doctor can prescribe a prescription for the patient. Patients can view their prescription from the “Medical History” page. Patients also have the option to download their prescription as a PDF for convenience. Patients can see the date when the prescription was prescribed. They can know about the symptoms they are facing along with the actual prescription. Figure 30 shows the pdf version of the prescription.Figure 29
Patient’s medical history.Figure 30
Patient’s prescription pdf version.Video calling and chatting is the main feature of our system. To initiate a video, a patient or doctor needs to share their user ID with each other to start the video call. A unique user ID will be provided each time a user enters the room. After receiving the user ID, either one has to press connect. After pressing the button to connect, the user ID of the second person will be visible on the screen of the person who initiated the video call. Then, by pressing the call button, both parties can take part in a video call. Both users need to give permission to allow their local device to use the microphone and webcam. For chatting, a user needs to simply type a name and the message they wish to send. The video calling website is hosted on Heroku. Heroku is a cloud platform as a service (PaaS), the first of its kind. As Heroku supports Node.js, this paper has developed the video calling feature using Node.js, WebRTC, and Socket.IO as shown in Figure31.Figure 31
Video calling and chatting feature.The proposed system in this paper implements a remote health monitoring system for asthmatic patients compared to other systems that only detect asthma attacks or just measure the patient’s condition. Table5 shows the comparison sensors used in this paper and other papers. A comparison of the software and hardware of this paper with other papers is provided in Table 6. In [9], similar to this system, a doctor can only receive a patient’s health-related information and warn if the patient is in a volatile area, and in [10], a support vector machine (SVM) classification algorithm was used to detect asthma attacks. The system in [11] is very similar to this system as well, and in [13], a smart wearable device was implemented to detect asthma attacks. All of the systems mentioned above lacked real-time communication between the doctors and patients, and the maximum number of systems was hardware-based. This system is the only system that implements real-time video communication. This system has developed two separate but interconnected platforms for both doctors and patients. Furthermore, using programming languages like Java for the Android app and Python for the website made the system more efficient and reliable. Also, using SDK’s and Application Programming Interfaces (APIs) such as Firebase SDK, WebRTC, and Socket.IO made the system more reliable. This Tab. presents the comparison of various sensors that were used in this and other papers. As seen from the table, this paper used a pulse/heart rate sensor, a body temperature sensor, a humidity and room temperature sensor, a gas and air quality sensor, and an ECG sensor. Reference [11] only used humidity, air quality, and an activity sensor. On the other hand, [15] only used a pulse, humidity, and air quality sensor. It is clear that no other paper has used an ECG sensor and a body temperature sensor. This paper only lacks an activity sensor. Reference [17] used most of the same sensors but missed out on the ECG sensor. The software and hardware differences between different papers are shown in Table 6. It is seen from the table that only this paper has video calling and prescription prescribing services. Though [13] implemented a telemedicine service, it lacks video calling and prescription prescribing services. Although [17] is IoT-based and has a telemedicine service, it does not have the option of video calling or creating prescriptions for patients.Table 5
Sensors comparison.
No.NamePulse/heart rateBody temperatureHumidity/temperatureAir qualityECGActivity sensor1This paperYESYESYESYESYESNO2Ref. [11]NONOYESYESNOYES3Ref. [13]NOT specifiedNOT specifiedNOT specifiedNOT specifiedNOT specifiedNOT specified4Ref. [15]YESNOYESYESNONO5Ref. [17]YESYESYESYESNONOTable 6
Software and hardware comparison with other papers.
No.NameAppWebsiteVideo callingPrescriptionTelemedicine serviceIo-T based1This paperYESYESYESYESYESYES2Ref. [11]NONONONONOYES3Ref. [13]NONONONOYESYES4Ref. [15]YESNONONONOYES5Ref. [17]YESYESNONOYESYES


## 4. Conclusions

The design and execution of a remote health monitoring system for asthmatic patients are presented in this research. Asthma is a lifelong disease. There are currently no cures for this sickness, although constant monitoring of the patient can help the patient relieve a lot of suffering. The world is suffering from COVID-19, making other diseases like asthma far more dangerous. A remote health monitoring system is much needed as it is dangerous to visit the hospital during this pandemic. This system could also be helpful during the postpandemic situation as it allows people from rural areas to get proper treatment. This paper will be an innovation as no other app or website exists for asthma patients in Bangladesh. Moreover, it is also an innovation from an economic point of view, as there would be many earning opportunities if doctors used this system. This system will reduce the pain of asthma patients and guide them to a better life. This system will act as a role model and a blessing for the people of Bangladesh. Given the current health scenario in Bangladesh, where most people suffer from respiratory diseases, yet they do not get proper treatment or cannot afford the cost. There is a great demand and supply gap in the market where we can intervene and change the scenario for the betterment of our people. We will be able to contribute if provided with proper financial and structural support from the government, nongovernmental organizations (NGOs), and other entities. At the current state, it is not possible for us to operate on such a large scale. However, our idea can be implemented by capable organizations or other entities, and that will transform the healthcare scenario in our country. This research can be enhanced in the following areas in the future: (1) integrate cross-platform compatibility, such as iOS support; for now, the mobile app only runs on Android devices; (2) add more sensors such as blood glucose, digital weight machines, blood pressure, and activity sensors; (3) integrate blockchain technology to address security concerns. The video calling and chatting features are not secured at this moment. Blockchain technology paired with end-to-end encryption will improve video chat security. IoT devices can send data to private blockchain networks where everything will be recorded and added to a secure, unchangeable data chain.



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*Source: 2192913-2021-11-30.xml*