Use an infrared receiving tube as a flame sensor, and the relay will open when there is a flame. The buzzer alarm status indicator light changes and an audible and visual alarm is issued.
The MQ-2 gas sensor circuit has also been added, and has the same effect as the infrared receiving tube when triggered.
The PCB was automatically routed and modified in some places and optimized later. The test on the perforated board passed.
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