MQ4 MQ 4 METHANE GAS SENSOR CNG GAS SENSOR:

This is very easy to use a low-cost semiconductor Gas sensor Module with analog and digital output. This module uses an MQ4 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 this Gas Sensor module is sensitive to Methane it is also a small sensitivity to alcohol & smoke

Specification:

• Power Supply: 5 Volts
• Interface Type: Analog & Digital
• High Sensitivity to Methane & small sensitivity to smoke & alcohol
• Low Cost.
• Stable & Long Life.
• Onboard Power indication.

Features: 

The instruction of Wiring:

• VCC: positive power supply (5V)
• GND: power supply is negative
• DO: TTL switching signal output
• AO: analog signal output