This is a simple-to-use compressed natural gas (CNG) sensorsuitable for sensing  natural gas (composed of mostly Methane [CH4]) concentrations in the air. The MQ-4 can detect natural gas concentrations anywhere from 200 to 10000ppm.

This sensor has a high sensitivity and fast response time. The sensor\'s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5Vadd a load resistanceand connect the output to an ADC.

This sensor comes in a package similar to our MQ-3 alcohol sensorand can be used with the breakout board below.