User Manual

MQ-5 Gas Sensor User Manual Waveshare
1
MQ-5 Gas Sensor User Manual
1. Features
Sensitive gas
Liquefied gas, natural gas
and coal gas
Boost converter chip
PT1301
Operating voltage
2.5V-5.0V
Dimensions
40.0mm*21.0mm
Fixing hole size
2.0mm
Operating principle:
MQ-5 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-5 plays a high performance in detecting
butane, propane and methane, and can identify both propane and methane at
a same time. MQ-5 is highly sensitive to natural gas. It features with the ability
to detect various inflammable gases and lower cost, making it an ideal choice
of different applications of gas detection.
2. Applications
This module can be applied to liquefied gas, natural gas and/or coal gas
monitoring devices for household or industrial usage.
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 sensitive 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.