User Manual

MQ-7 Gas Sensor User Manual Waveshare
2
Port
Arduino pin
DOUT
D2
AOUT
A0
GND
GND
VCC
5V
③ 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 carbon monoxide, you will find
the indicator turns on. While take the sensor out of the container, you
can see the indicator turns off.