Waveshare Flame Sensor Module - Analog/Digital Output

The sensor detects infrared light in the 760nm to 1100nm spectrum, which is characteristic of flames. It has a detection cone angle of approximately 60 degrees. The actual detection distance depends on flame size and intensity, but it is designed for close-range monitoring within a few meters, not long-distance fire spotting.

Connect VCC (3.3-5.3V) and GND to your power source. The DO (Digital Output) pin provides a clean HIGH/LOW signal based on the adjustable threshold set by the onboard potentiometer. The AO (Analog Output) pin provides a variable voltage proportional to the detected IR intensity, which can be read by an ADC pin on a microcontroller for more nuanced data.

Yes. The module's operating voltage range is 3.3V to 5.3V, making it directly compatible with both 3.3V logic systems (like Raspberry Pi, ESP32) and 5V systems (like most Arduino boards). The digital output signal will match the supplied VCC voltage, ensuring proper logic level compatibility.

Sensitivity is adjusted via the blue potentiometer on the module. Turning it clockwise typically increases sensitivity (makes the digital output trigger more easily). Use a small screwdriver to adjust while testing with a controlled IR source or flame simulator to achieve the desired detection threshold and avoid false triggers.