9522 – Hall 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 Hall sensor uses a 49E Hall element with an on-board LM393 comparator. It provides both analog and digital outputs, operates from 2.3–5.3 V, and can be wired to Pico, STM32, and Arduino boards.

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Technical overview

Sensor element: 49E Hall sensor; wide-range voltage comparator type LM393.
Power supply: 2.3 V to 5.3 V.
Dimensions: 27.0 mm × 15.5 mm; mounting holes 2.0 mm diameter.
Pinout: VCC (power), GND (ground), AOUT (analog data output), DOUT (digital data output).
Sensitivity is adjustable via a potentiometer; an onboard indicator LED reflects the output state.
Wiring for Raspberry Pi Pico: VCC→3.3 V, GND→GND, AOUT→GP26, DOUT→GP22.
Wiring for STM32F103RBT6: VCC→3.3 V, GND→GND, AOUT→PA6, DOUT→PA4.
Wiring for Arduino UNO: VCC→5 V, GND→GND, AOUT→A0, DOUT→D2.

Commands and examples – verify before use:

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/7/75/Hall-Sensor-code.7z
7z x Hall-Sensor-code.7z -o./Hall-Sensor-code
cd ~/Hall-Sensor-code
cd ~/Hall-Sensor-code/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 provided examples are version-specific (e.g., rp2-pico-20210418-v1.15.uf2 for MicroPython); compatibility must be verified when using other firmware versions.
STM32 examples target STM32F103RBT6 or STM32H743; other STM32 boards require porting the code yourself.
Flashing Pico firmware requires holding the BOOTSET button while connecting via USB – the step order must be followed exactly.
When using a Raspberry Pi Zero, run only “make” instead of “make -j9”.
The digital output is not monotonic with magnetic field strength: it may decrease once the field exceeds a certain level; behavior near the threshold should be verified practically.
The source gives no information on certifications, warranty, or safety compliance – these must be confirmed separately.

Source and revision record

Hall Sensor - Waveshare Wiki
Source revision: 68900
Captured: 2026-08-29T09:32:53+00:00
SHA-256: f080ec349d3aeabf75e5f4ebc10b4b3f44ad67225ef25319a7268e493d2d7542