## 1 Introduction
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Ref.** & **Parameter** & **Sensor Hardware** & **IoT** & **Remark** \\ \hline
[7] & Leaf temperature & FLIR Vue Pro R & - & Standalone thermal camera (640 \(\times\) 512 pixels) \\ \hline
[8] & Leaf temperature & FLIR P660 & - & Standalone thermal camera (640 \(\times\) 480 pixels) \\ \hline
[9] & Leaf temperature & FLIR C2 & - & Standalone thermal camera (80 \(\times\) 60 pixels) \\ \hline
[10] & Leaf temperature & FLIR Lepton 3.5 & - & Thermal camera is connected to Raspberry Pi 4 \\ \hline
[11] & Leaf temperature & FLIR Lepton 3.5 & - & Thermal camera is connected to Raspberry Pi 3 \\ \hline
[12] & Leaf temperature & \
\begin{tabular}{c} 16 \(\times\) 4 Thermopile Array \\ (DIWELL Electronics) \\ \end{tabular} & - &
\begin{tabular}{c} Thermopile array is connected \\ to STM32L476 \\ \end{tabular} \\ \hline
[13] & Leaf temperature & MLX90620 & - &
\begin{tabular}{c} Thermopile array is connected to \\ Arduino Mega \\ \end{tabular} \\ \hline
[14] & Air temperature & DHT11 & Blynk &
\begin{tabular}{c} DHT11 is connected to Arduino \\ and ESP8266 WiFi module for \\ IoT communication \\ \end{tabular} \\ \hline
[15] & Air temperature & DHT11 & \
\begin{tabular}{c} Authors developed \\ Android Appl. \\ \end{tabular} &
\begin{tabular}{c} DHT11 is connected to NodeMCU \\ for IoT communication \\ \end{tabular} \\ \hline
[16] & Air temperature and &
\begin{tabular}{c} SDI-12 sensors \\ and moisture \\ \end{tabular} & ADCON & Sensors are connected to ADCON \\ \hline
[17] & Air temperature and & \begin{tabular}{c} Shirt10; BMP180; LDR; MQ2 \\ alcohol, smoke \\ \end{tabular} & \
\begin{tabular}{c} Authors developed \\ IoT-based SCADA \\ \end{tabular} &
\begin{tabular}{c} Sensors are connected to \\ NodeMCU for IoT communication \\ \end{tabular} \\ \hline
[18] & \begin{tabular}{c} Air temperature and \\ humidity; soil temperature \\ and moisture; CO\({}_{2}\) \\ \end{tabular} & \
\begin{tabular}{c} DHT11; TELESKY \\ FC-28; MG811 \\ \end{tabular} & Huawei cloud &
\begin{tabular}{c} Sensors are connected to \\ STM32L431 for \\ IoT communication \\ \end{tabular} \\ \hline
[19] & \begin{tabular}{c} Air temperature and \\ humidity; soil moisture \\ \end{tabular} & \begin{tabular}{c} DHT11; Capacitive soil \\ moisture sensor \\ \end{tabular} & \
\begin{tabular}{c} Thing5 peak; Blynk; \\ Open as App \\ \end{tabular} &
\begin{tabular}{c} Sensors are connected to \\ NodeMCU for IoT communication \\ \end{tabular} \\ \hline
[20] & \begin{tabular}{c} Soil temperature, \\ conductivity, humidity, \\ and pH \\ \end{tabular} & No information provided & \
\begin{tabular}{c} Amazon Web \\ Services (AWS) \\ \end{tabular} &
\begin{tabular}{c} Sensors are connected to \\ Raspberry Pi 3 for \\ IoT communication \\ \end{tabular} \\ \hline
[21] & \begin{tabular}{c} Air temperature and \\ humidity; Light \\ \end{tabular} & DHT11; GY-30 & \
\begin{tabular}{c} Authors developed \\ Web application \\ \end{tabular} &
\begin{tabular}{c} Sensors are connected to \\ NodeMCU and raspberry Pi for \\ IoT communication \\ \end{tabular} \\ \hline
[22] & \begin{tabular}{c} Air temperature and \\ humidity; soil temperature \\ and moisture; CO\({}_{2}\); leaf \\ humidity; light \\ \end{tabular} & \begin{tabular}{c} RS-WS-N01-2; No \\ information provided for soil \\ and gas sensors; YT-YSW; \\ RS-GZ-N02 \\ \end{tabular} & \
\begin{tabular}{c} Authors developed \\ Web application \\ \end{tabular} &
\begin{tabular}{c} Sensors are connected to \\ acquisition unit using \\ LoRa communication \\ \end{tabular} \\ \hline
[23] & \begin{tabular}{c} Air temperature, humidity, \\ pressure, and gas; soil NPK \\ \end{tabular} & \
\begin{tabular}{c} BME688; Taidacent and JXCT \\ \end{tabular} & Thing5 peak &
\begin{tabular}{c} NPK sensor is connected to \\ ELEGOO Nano Board; Air sensor \\ is connected to ESP8266 \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Literature survey of plant monitoring systems.