# The Wearable Physical Fitness Training Device Based on Fuzzy Theory
## 3 The Proposed Method: Physical Fitness Training Device
This chip uses an MT7688 AN wireless chipset with an ATmega32U4 microcontroller (MCU). The MT7688 AN system-level chip is the core of the development platform. Moreover, this system-level chip has high performance 802.11n 1T1R Wi-Fi AP, supports up to 2 GB of RAM, and includes an SD card. It has a Wi-Fi encryption engine and various peripheral connection capabilities. Developers can also use the UART interface to communicate with the MCU, as shown in Figure 5.  
Figure 4: Fitness management device schematic. Figure 5: LinkIt Smart 7688 Duo Support Program List. * **Body Temperature Sensing Module** This study used an MLX90614 module to measure a subject's body temperature. The Melexis MLX90614 is a non-contact infrared thermometer for temperature measurement with an IR thermopile detector chip. The digital output of the thermometer is PWM. In the 10-bit PWM configuration, the continuous output measurement range is between \(-20\)\({}^{\circ}\)C and \(120\)\({}^{\circ}\)C. In addition, the MLX90614 has a low-noise amplifier and a powerful DSP unit for high precision and thermometer resolution. The temperature of the environment is calculated accurately. * **Risk Factor Sensing Module** This study uses a DHT11 temperature and humidity sensor to monitor external temperature and humidity for risk factor assessment. It can collect real-time humidity and temperature data. The sensors' simple single-chip computer bus can be used to communicate directly through the calibrated digital signal output. The DHT11 uses minimal power, and the average operating current is 0.5 mA. Upon receiving a start signal, the DH11T response signal is received by the Arduino system platform, with a delay of 20-40 \(\upmu\)s.
* **Blood Oxygen Sensing Module** This study uses an ear-clip type MAX30100 pulse oximetry sensor. The MAX30100 sensor is a pulse oximeter heart-rate sensor. In general, this device is an optical sensor whose measured readings come from the two LEDs emitting two wavelengths of light. The emitted light is focused on a permeable single point to monitor the oxygenated blood in the skin. * **Cloud Network Management Platform**[38] MCS is a free cloud-based platform, which allows fast prototyping of wearable devices for data and device management services, focusing mainly on MECC connectivity. MCS is presented in webpage form and provides the MCS APP for Android and iOS. It can collect its own API data returned from the device and provide a graphical interface to display data in the development of the page. A developer can create a prototype by collecting the information using the MCS from the sensing elements of the device. These data channels can be divided into the following categories: display, controller, and integrated display controller. This type of data channel and display can store and display the data collected by the sensing elements of the device. For example, data on temperature are uploaded from the sensing component of the device, and the MCS will store the data in a time series by monitoring the situation in real time. The MCS can also control the remote terminal through the webpage. The device uses a built-in controller system to control the state of the components within the device. The MCS can set trigger conditions and actions. When the value returned by a specific data channel exceeds the set range, the system will send an email or mobile phone notification. Users can also choose whether to receive email or mobile phone notifications. MCS supports webhook trigger, and it can enter the URL notification made. The system will set automatic notifications when a specific condition is triggered (push phone or email), and the notification will be sent to each user. Thus, trainers can be immediately notified according to the set trigger conditions, and implement timely training adjustments or medical treatment for risk management and prevention. Figure 6 shows the MCS operating interface. The MCS can also perform multi-person management.