I used an MQ2 smoke, LPG (Liquified Petroleum Gas), and CO (Carbon Monoxide) sensor. I used freely available code to get the sensor working with an Arduino Nano. Then taking an Ultra Cheap 433MHZ ...

When gas leakage is detected and its concentration exceeds a predefined threshold, the MQ2 sensor sends a signal to the Arduino. Upon receiving the signal from the sensor, the Arduino triggers the ...