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WSAL12225 – Photo Interrupter Sensor/en

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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.

Summary

The Photo Interrupter Sensor is a light-interruption sensor used for speed measurement, e.g., in smart cars. It uses a WYC-H206 slot photoelectric sensor with an infrared emitter and receiver plus a Schmitt trigger for stable signals.

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Technical overview

  • Principle: An infrared transmitter and receiver form a slot; when the beam is interrupted, the receiver output goes low through an inverting Schmitt trigger.
  • Power supply: 3.3 V to 5 V (VCC).
  • Dimensions: 26.8 mm × 15 mm × 18.7 mm; mounting hole diameter 3 mm; gap width 6 mm.
  • Pinout: DOUT = digital data output, GND = power ground, VCC = 3.3–5 V supply.
  • Pico connection: VCC to 3.3 V, GND to GND, DOUT to GP22.
  • STM32 connection (example on STM32F103RB): VCC to 3.3 V, GND to GND, DOUT to PA4.
  • Arduino UNO connection: VCC to 5 V, GND to GND, DOUT to D2.
  • Expected behavior: When blocked by an object, the signal LED turns on and the serial port prints “ON”; otherwise the LED stays off and the serial port prints “OFF”.

Commands and examples – verify before use:  

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/f/f6/Photo_Interrupter_Sensor_Demo.7z
7z x Photo_Interrupter_Sensor_Demo.7z -o./Photo_Interrupter_Sensor_Demo
cd ~/Photo_Interrupter_Sensor_Demo
cd Pico/c/build/
export PICO_SDK_PATH=../../pico-sdk
cmake ..
make -j9
cp main.uf2 /media/pi/RPI-RP2/

Notes and version constraints

  • The provided sample demos are tied to specific boards (e.g., STM32F103RB, Arduino UNO); other boards may require modified connections and possibly custom porting.
  • Firmware versions can affect script behavior; using the supplied MicroPython firmware is recommended.
  • Speed-measurement accuracy depends on slot geometry (6 mm gap) and sampling rate; no further measurement values are given in the source text.
  • No information on certifications, warranty or safety notes is present – clarify separately before product integration.

Source and revision record

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