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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 />
Compact reflective sensor with an infrared transceiver, LM393 voltage comparator and adjustable sensitivity. Provides analog and digital outputs for simple obstacle detection.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/9523 9523 – Infrared Reflective Sensor]<br />
* [https://shop.jw-tech.eu/p/WSAL9523 WSAL9523 – Infrared Reflective Sensor]<br />
<br />
== Technical overview ==<br />
* Sensor element: ST188 infrared reflective transceiver.<br />
* Supply voltage: 3.0 V to 5.3 V; the VCC pin is specified as 3.3 V to 5.3 V in the pinout table.<br />
* The AOUT pin provides an analog signal proportional to reflected light; DOUT provides the comparator’s digital output.<br />
* Onboard LM393 wide-voltage comparator sets the threshold between the two outputs.<br />
* A potentiometer on the board adjusts the effective detection distance; the FAQ states it is about 5 cm.<br />
* Board size is 25 mm × 15.9 mm with 2.0 mm mounting holes.<br />
* Example connections: Pico GP26/GP22, STM32F103RB PA6/PA4, Arduino UNO A0/D2.<br />
* Demo code archives are provided for Raspberry Pi Pico (C/MicroPython), STM32 (HAL) and Arduino UNO.<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/<br />
cd build<br />
export PICO_SDK_PATH=../../pico-sdk<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 shown example files are named “Infrared_Proximity_Sensor” – verify whether they actually match the reflective sensor or are only references.<br />
* The demo archive is downloaded via wget; without network access it cannot be fetched.<br />
* Flashing the Pico firmware requires a USB connection to a PC or Pi; exact steps depend on the firmware version used.<br />
* STM32 examples target the STM32F103RBT6 and STM32H743; other boards need custom adaptation.<br />
* Arduino examples are for the UNO; compatibility with other Arduino boards must be checked individually.<br />
* The stated supply voltage varies slightly between sections (3.0–5.3 V vs. 3.3–5.3 V); confirm the exact specification of your specific module before wiring.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Infrared_Reflective_Sensor Infrared Reflective Sensor - Waveshare Wiki]<br />
* Source revision: 80566<br />
* Captured: 2026-08-29T09:34:13+00:00<br />
* SHA-256: <code>02ffd310afcf21023476bc36ffe5ece5b7eb164f6d162cabd11b621fb5dc11cf</code></div>JWTechPublisher