1)inits()----> for serial begin or anything you want to describe 2)calibrate()-----> for calibrating sensor RL resistor inside ... define threshold for specific gas name and it returns true or false 5 ...

By using the MQ2 gas sensor, we can detect the presence of gases such as LPG, smoke, alcohol, propane, hydrogen, methane, and carbon monoxide. The ESP8266 Wi-Fi module connects the sensor to the ...