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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
Technical overview of the Waveshare Flame Sensor: features, pinout, and integration with Pico, STM32, and Arduino UNO.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/9521 9521 – Flame Sensor]<br />
* [https://shop.jw-tech.eu/p/WSAL9521 WSAL9521 – Flame Sensor]<br />
<br />
== Technical overview ==<br />
* The sensor responds to a flame spectrum from 760 nm to 1100 nm with a detection angle of 0–60 degrees.<br />
* It uses an LM393 comparator with adjustable sensitivity via an onboard potentiometer.<br />
* Power supply is 3.3 V to 5.3 V; operating temperature range is -25 °C to 85 °C.<br />
* Module dimensions are 27.3 mm × 15.4 mm; mounting holes are 2.0 mm in diameter.<br />
* Pinout: DOUT (digital output), AOUT (analog output), GND, and VCC power input.<br />
* For Raspberry Pi Pico wiring: VCC to 3.3 V, GND to GND, AOUT to GP26, DOUT to GP22.<br />
* Pico examples include C/C++ and MicroPython; firmware must be flashed to the Pico before use.<br />
* For STM32F103RBT6: VCC to 3.3 V, AOUT to PA6, DOUT to PA4; examples use the HAL library and Keil MDK-ARM project.<br />
* For Arduino UNO: VCC to 5 V, AOUT to A0, DOUT to D2; load and upload Flame_Sensor.ino via Arduino IDE.<br />
* With a flame height of 5 cm, the detection distance is approximately 1 m per the FAQ.<br />
* Sensitivity can be adjusted by turning the potentiometer on the module.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo apt-get install p7zip-full<br />
cd ~<br />
sudo wget https://files.waveshare.com/upload/d/d8/Flame-Sensor-code.7z<br />
7z x Flame-Sensor-code.7z -o./Flame-Sensor-code<br />
cd ~/Flame-Sensor-code/Pico/c/build/<br />
export PICO_SDK_PATH=../../pico-sdk<br />
cmake ..<br />
make -j9<br />
cp main.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* Example files target specific board variants (STM32F103RB, Arduino UNO); other boards require adapted wiring and code porting.<br />
* The Pico firmware version is version-sensitive; the source recommends using the firmware from the demo codes archive.<br />
* The stated detection distance (1 m at 5 cm flame) comes from the FAQ and should be human-confirmed before use in safety-critical applications.<br />
* No safety, certification, or warranty claims are present in the source; these must not be added.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Flame_Sensor Flame Sensor - Waveshare Wiki]<br />
* Source revision: 68921<br />
* Captured: 2026-08-29T09:31:44+00:00<br />
* SHA-256: <code>2ae99689d81b9b08511cfcbad42e51731b526d4b8d3db8b70ec792b100d90dd6</code></div>JWTechPublisher