User Manual

MQ-2 Gas Sensor User Manual Waveshare
1
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
4
VCC
Positive power
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.
① 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 debugging software.
Here is the configuration of the connection between the module and the
development board.