MQ-2 Gas Sensor User Manual
Contents
1. MQ 2 Gas Sensor User Manual Waveshare MQ 2 Gas Sensor User Manual 1 Features Sensitive gas Liquefied gas propane and hydrogen Boost converter chip PT1301 Operating voltage 2 5V 5 0V Dimensions 40 0mm 21 0mm Fixing hole size 2 0mm Operating principle MQ 2 gas sensor applies SnO2 which has a lower conductivity in the clear air aS a gas sensing material In an atmosphere where there may be inflammable gases the conductivity of the gas sensor raises along with the inflammable gas concentration increases MQ 2 performs a good detection to different inflammable gases such as natural gas especially sensitive to liquefied gas propane and hydrogen Its ability to detect various inflammable gases and lower cost make it an ideal choice of different applications of gas detection 2 Applications This module can be applied to household or industrial gas leakage detection devices 3 Interfaces Pin No Symbol Descriptions 1 DOUT Digital output 2 AOUT Analog output 3 GND Power ground Positive power i woe supply 2 5V 5 0V 4 How to use We will illustrate the usage of the module with an example of inflammable gas detection by connecting a development board Download the relative codes to the development board 2 Connect the development board to a PC via a serial wire and the module to the development board Then power up the development board and start the serial debug2. ging software Here is the configuration of the connection between the module and the development board MQ 2 Gas Sensor User Manual Waveshare Port STM32 MUC pin DOUT GPIOA 4 AOUT GPIOA 6 GND GND VCC 3 3V Port Arduino pin DOUT D2 AOUT AO GND GND VCC 5V Warn up the sensor for a minute 4 The detected result can be checked by the LED indicator on the module Put the sensor into a container filled with inflammable gas you will find the indicator turns on While take the sensor out of the container you can see the indicator turns off
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