MQ4 Methane CNG Gas Sensor Module

The MQ4 Methane CNG Gas Sensor Module detects methane (CH4) and natural gas (CNG) with an easy interface using a standard 4-pin header. It provides both analog and digital outputs, with an onboard potentiometer to set the gas concentration threshold. Powered by 5V, it signals gas presence via an LED and can interface with microcontrollers for readings from 200 to 10,000 ppm.