A flame sensor works by detecting the infrared radiation emitted by fire, which makes it suitable for building simple educational fire-detection systems that alert when a nearby flame source is sensed.
Components needed
An Arduino Uno board, a flame sensor module, an LED for alerting, and connecting wires.
Wiring it up
The sensor's analog output connects to pin A0, and the indicator LED connects to digital pin 13.
How it works
The code reads the analog value from the sensor every 500 milliseconds, and classifies the danger level using three thresholds: readings above 800 mean a flame source is very close, triggering rapid blinking as an urgent alarm; readings between 500 and 800 mean moderate detection, keeping the LED steadily lit; while readings below 500 mean no danger, turning the LED off entirely.
You can find flame sensors at Juthour Tech.
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