MQ 4 module is a very easy to use low cost semiconductor Gas sensor Module with analog and digital output. This module uses MQ 4 Methane gas sensor as a gas sensing element. It requires no external components just plug in Vcc & ground pins and you are ready to go.For Digital output the threshold value can be easily set by an on-board potentiometer. Using this module you can easily interface MQ4 Methane (CNG) gas Sensor to any Microcontroller, Arduino or even Raspberry Pi. Since the MQ 4 Methane Gas Sensor module is sensitive to Methane, it is also small sensitivity to alcohol & smoke.
Specification of MQ 4 GAS Sensor Module:-
Power Supply: 5 Volts
Interface Type: Analog & Digital
High Sensitivity to Methane & small sensitivity to smoke & alcohol
Stable & Long Life.
On board Power indication.
The instruction of Wiring:-
1. VCC: positive power supply (5V)
2. GND: power supply is negative
3. DO: TTL switching signal output
4. AO: analog signal output
Suitable for home or factory methane gas , natural gas and other monitoring devices to test natural gas, methane 300 to 10000ppm