9524 – Laser Sensor/en

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 Waveshare Laser Sensor (P/N 9524) is a digital obstacle-detection sensor based on the PT1301 chip. It uses modulated light at 650 nm and reports object presence via a digital output signal.

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Technical overview

Boost chip: PT1301
Effective detection range: typically 0.01–0.8 m; maximum 1.5 m
Operating voltage: 2.5 V to 5.0 V
Dimensions: 53.0 mm × 18.0 mm; mounting holes 2.0 mm
Principle: A 180 kHz oscillator modulates the laser beam; the receiver accepts only same-frequency reflected light, reducing interference from ambient visible light
Applications: obstacle detection, pipeline counter, smart robot, obstacle-avoiding car
MCU wiring: VCC to 2.5–5.0 V supply, GND to ground, DOUT to a digital input of the MCU
Digital output: returns 0 or 1 rather than an analog value
Optical wavelength: 650 nm; the receiver detects modulated visible radiation in the 650–950 nm band
Operating current: approximately 40 mA at 3.3 V

Commands and examples – verify before use:

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

Notes and version constraints

Do not touch resistors or capacitors on the board while it is powered, to avoid burning out the infrared emitting tube.
Never point the laser directly at eyes – it can damage vision.
The STM32 examples are based on STM32F103RBT6 and STM32H743; other boards require custom wiring and code porting.
The Arduino example targets the Arduino UNO; other boards need modified connections.
Firmware selection for Pico is version-sensitive: prefer the supplied MicroPython firmware (rp2-pico-20210418-v1.15.uf2), as other firmwares may cause abnormal behavior.
For Pico C development, the Pico SDK path must be exported correctly; otherwise the build will fail.
All statements regarding compatibility, current draw, certifications, and warranty come solely from the source and should be confirmed by qualified personnel before release.

Source and revision record

Laser Sensor - Waveshare Wiki
Source revision: 89780
Captured: 2026-08-29T09:35:16+00:00
SHA-256: a2d454f645a5630262a9aab4a7cf5445aacfed43ef4cdedf8161a5594f9c977b