[Retracted] Research and Development of an IoT-Based Remote Asthma Patient Monitoring System

Table 2

Description of the components.

Components		Description
MAX30100		The 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.
MLX90614		The MLX90614 is an infrared thermometer that measures temperature without touching it. It is a little device that’s simple to incorporate with high precision.
DHT11		The 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-135		MQ-135 is a gas sensor which can monitor air quality. The sensor can detect/measure ammonia, smoke, CO2, alcohol, benzene, etc.
AD8232		The AD8232 is an ECG signal conditioning block with integrated signal conditioning. It can extract, amplify, and filter tiny biopotential signals.
NodeMCU ESP8266		This 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].