The MQ4 methane gas sensor is a MOS (metal oxide semiconductor) type sensor that detects methane gas concentration in the air at home or in the workplace and gives an analog voltage output when read.
More specs:https://www.utmel.com/components/how-to-use-mq4-gas-sensor?id=821
More specs:https://www.utmel.com/components/how-to-use-mq4-gas-sensor?id=821
1. MQ4 Gas Sensor
