Keyestudio ARDUINO maker learning kit Manual page 60

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Working principle:
Flame sensor is made based on the principle that infrared ray is highly sensitive to flame. It has a
specially designed infrared receiving tube to detect fire, and then convert the flame brightness to
fluctuating level signal. The signals are then input into the central processor and be dealt with
accordingly.
Sensor connection
The shorter lead of the receiving triode is for negative, the other one for positive. Connect
negative to 5V pin, positive to resistor; connect the other end of the resistor to GND, connect one
end of a jumper wire to a clip which is electrically connected to sensor positive, the other end to
analog pin. As shown below:
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