Keyestudio KS4028 Manual page 328

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Make combinations of these blocks:
Micro:bit
Expansion
（MQ-2）Sensor
Board
GND
5V
S（1）
(4)Test Results:
Upload the test code to the micro:bit, plug in power and dial the DIP switch
to ON. Then the micro:bit will show smile expression and a green indicator
will be on. You can adjust the blue potentiometer to make the sensitivity
high.
The micro:bit will show a smile image. You can maintain the sensitivity
Analog Gas
G
V
D
328