PIN Diode Based Fire SensorThis is an ultra-sensitive fire sensor that activates an alarm when it detects fire. In this circuit, a sensitive PIN diode is used as a fire sensor for longer-range fire detection. It detects visible light and infrared (IR) in the range of 430 nm – 1100 nm. Visible light and IR from the fire activate the sensor to trigger the alarm. It also detects sparks in the mains wiring and if these persist, it gives a warning alarm. The anode can easily be identified from the top-view flat surface of the photodiode. A small solder point to which a thin wire is connected is the anode and the other one is the cathode terminal

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Rohit Nagar · Accepted Answer

PIN Diode Based Fire SensorThis is an ultra-sensitive fire sensor that activates an alarm when it detects fire. In this circuit, a sensitive PIN diode is used as a fire sensor for longer-range fire detection. It detects visible light and infrared (IR) in the range of 430 nm – 1100 nm. Visible light and IR from the fire activate the sensor to trigger the alarm. It also detects sparks in the mains wiring and if these persist, it gives a warning alarm. The anode can easily be identified from the top-view flat surface of the photodiode. A small solder point to which a thin wire is connected is the anode and the other one is the cathode terminal

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