Tutorial (german): https://tutorials-raspberrypi.de/raspberry-pi-gas-sensor-mq2-konfigurieren-und-auslesen
Tutorial (english): https://tutorials-raspberrypi.com/configure-and-read-out-the-raspberry-pi-gas-sensor-mq-x
tutRPi/Raspberry-Pi-Gas-Sensor-MQ
Raspberry Pi Library for several MQ Gas Sensors (MQ-2, MQ-3, etc.)
Python