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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 infrared proximity sensor (WSAL12224): operating principle, specifications, pinout and wiring for Pico, STM32 and Arduino.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL12224 WSAL12224 – Infrared Proximity Sensor, Obstacle-Avoiding]<br />
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== Technical overview ==<br />
* Operating principle: An IR LED emits infrared light; an IR receiver converts reflected light into an electrical signal. The LM393 comparator outputs a digital signal and a green LED indicates detection status.<br />
* Power supply: 3.3 V to 5 V via the VCC pins.<br />
* Dimensions: 39 mm × 15.5 mm (including the IR LED); mounting holes are 3 mm in diameter.<br />
* Detection range: approximately 2 cm to 30 cm, depending on the obstacle's color; a white object gives the longest range.<br />
* Detection angle: 35°.<br />
* Recommended environment: indoor use, avoid direct sunlight.<br />
* Pinout: 1 DOUT (digital output), 2 AOUT (analog output), 3 GND, 4 VCC (3.3–5 V).<br />
* Sensitivity adjustment: The onboard potentiometer knob sets the effective detection distance; the default is about 5 cm.<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/0/05/Infrared_Proximity_Sensor_Demo.7z<br />
7z x Infrared_Proximity_Sensor_Demo.7z -o./Infrared_Proximity_Sensor_Demo<br />
cd ~/Infrared_Proximity_Sensor_Demo/Pico/c/build/<br />
cmake ..<br />
make -j9<br />
cp main.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
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== Notes and version constraints ==<br />
* The URLs present in the source material were included only as command-line commands; their validity must be verified before execution.<br />
* The Pico guide assumes flashing MicroPython firmware over USB; the exact firmware version may be version-sensitive – human confirmation required.<br />
* The STM32 examples are based on STM32F103RBT6 or STM32H743; other STM32 boards require custom porting and adjusted pin mapping.<br />
* The Arduino examples target the Arduino UNO; compatibility with other boards must be checked separately.<br />
* The stated default range of about 5 cm is a reference value and can vary with the surface of the detected object.<br />
* No safety, certification, or warranty claims are present in the source; such statements must not be added.<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Infrared_Proximity_Sensor Infrared Proximity Sensor - Waveshare Wiki]<br />
* Source revision: 70266<br />
* Captured: 2026-08-30T03:20:28+00:00<br />
* SHA-256: <code>57f28d16b783964b805e728164e6f9c8181864ac7b81199cf828b0f5bd624126</code></div>JWTechPublisher