This is a simple-to-use MQ-6 Liquefied Petroleum Isobutane Propane Gas Sensor module, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air.
The MQ-6 can detect gas concentrations anywhere from 200 to 10000ppm.
This sensor has high sensitivity and a 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 5V, add a load resistance, and connect the output to an ADC.
The sensitive material of the MQ-6 gas sensor is SnO2, which with lower conductivity in clean air.
When the target combustible gas exists, The sensor’s conductivity is higher along with the gas concentration rising.
Please use a simple electro circuit, Convert the change of conductivity to the corresponding output signal of gas concentration.