I want to have the code for MQ2 gas sensor.
The Simple arduino MQ2 code.
When MQ2 gas sensor detect the gas (can be any gas but will use the hot water vapor) then the Fan will spin.
But can you help me to have the button switch to on and off this MQ2 sensor coding?
button (on/off) -> MQ2 gas sensor detect the gas -> Fan spinning
Please help me !!