MQ6 LPG & Butane Sensor Module
MQ6 LPG and Butane 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 module’s heater coil with 5V, and connect the output to an Analog pin.
The MQ6 can detect gas concentrations anywhere from 200 to 10000ppm.