Introduction

The MQ2 Gas Sensor module is useful for gas leakage detecting. It can detect combustible gas, smoke and so on. The sensitivity can be adjusted by the built-in potentiometer, there are two types of the output: analog output and digital output, so, it’s able to read analog data and digital data. Remember to operate it in the controlled environment. there are details of the MQ gas sensor

Symbol        Detect gas                       Detect concentration

MQ-2          combustible gas,                  300-10000ppm

               Smoke

MQ-5          LPG, natural gas,                 300-10000ppm

                     Town gas

Features

Working voltage: 5V

Working Current: 150mA

DO: TTL output

AO: Analog output, it will be higher with more such gas.

Preheat time: Over 20s

Resource