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9523 – Infrared Reflective 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

Compact reflective sensor with an infrared transceiver, LM393 voltage comparator and adjustable sensitivity. Provides analog and digital outputs for simple obstacle detection.

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Technical overview

  • Sensor element: ST188 infrared reflective transceiver.
  • 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.
  • The AOUT pin provides an analog signal proportional to reflected light; DOUT provides the comparator’s digital output.
  • Onboard LM393 wide-voltage comparator sets the threshold between the two outputs.
  • A potentiometer on the board adjusts the effective detection distance; the FAQ states it is about 5 cm.
  • Board size is 25 mm × 15.9 mm with 2.0 mm mounting holes.
  • Example connections: Pico GP26/GP22, STM32F103RB PA6/PA4, Arduino UNO A0/D2.
  • Demo code archives are provided for Raspberry Pi Pico (C/MicroPython), STM32 (HAL) and Arduino UNO.

Commands and examples – verify before use:  

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/0/05/Infrared_Proximity_Sensor_Demo.7z
7z x Infrared_Proximity_Sensor_Demo.7z -o./Infrared_Proximity_Sensor_Demo
cd ~/Infrared_Proximity_Sensor_Demo/Pico/c/
cd build
export PICO_SDK_PATH=../../pico-sdk
cmake ..
make -j9
cp main.uf2 /media/pi/RPI-RP2/

Notes and version constraints

  • The shown example files are named “Infrared_Proximity_Sensor” – verify whether they actually match the reflective sensor or are only references.
  • The demo archive is downloaded via wget; without network access it cannot be fetched.
  • Flashing the Pico firmware requires a USB connection to a PC or Pi; exact steps depend on the firmware version used.
  • STM32 examples target the STM32F103RBT6 and STM32H743; other boards need custom adaptation.
  • Arduino examples are for the UNO; compatibility with other Arduino boards must be checked individually.
  • 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.

Source and revision record

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