This circuit is comprised of a relay switch, a flame sensor, a fan, a breadboard, and the Arduino to control the circuit. The fan’s negative is grounded to the breadboard, while the fan’s positive is attached to the relay switch’s Normally Open. The COM of the relay switch is powered by the Arduino. Arduino pin #4 is wired to the IN of the relay switch. The flame sensor’s output is hooked to Analog 0 of the Arduino in order to process the readings taken by the flame sensor. When the flame sensor detects infrared waves put off by fire or even LEDs, the relay switch with allow the power to flow into the fan, turning it on.
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