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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 />
The Waveshare liquid level sensor produces an analog output that increases with immersion depth. The module uses the current-amplification principle of a transistor; the signal is digitized via an ADC.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/9525 9525 – Liquid Level Sensor]<br />
* [https://shop.jw-tech.eu/p/WSAL9525 WSAL9525 – Liquid Level Sensor]<br />
<br />
== Technical overview ==<br />
* Detection range: 48 mm immersion depth<br />
* Supply voltage: 2.0 V to 5.0 V (pinout note: 3.3 V–5.0 V)<br />
* Dimensions: 19.0 mm × 63.0 mm<br />
* Mounting hole diameter: 2.0 mm<br />
* Output type: Analog output on AOUT<br />
* Operating principle: Liquid contact conducts between the transistor base and the positive supply rail; the resulting collector-emitter current amplification creates a voltage across the emitter resistor for the ADC to sample.<br />
* Pinout: AOUT (analog out), GND (ground), VCC (power)<br />
* Pico connection: VCC → 3.3 V, GND → GND, AOUT → GP26<br />
* STM32 connection (F103RB example): VCC → 3.3 V, GND → GND, AOUT → PA6<br />
* Arduino UNO connection: VCC → 5 V, GND → GND, AOUT → A0<br />
<br />
'''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/a/a0/Liquid-Level-Sensor-code.7z<br />
7z x Liquid-Level-Sensor-code.7z -o./Liquid-Level-Sensor-code<br />
cd ~/Liquid-Level-Sensor-code/Pico/c/build/<br />
export PICO_SDK_PATH=../../pico-sdk<br />
cmake ..<br />
make -j9<br />
cp main.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* Example projects are based on STM32F103RBT6 and STM32H743; other STM32 boards require adapting connections and code.<br />
* For Arduino boards other than UNO, compatibility must be verified by the user.<br />
* If the output value does not change after flashing, the threshold voltage may be set too high; reduce it to an appropriate value.<br />
* Flashing the Pico requires holding the BOOTSET button during USB connection so the RPI_RP2 disk appears.<br />
* The provided examples use the HAL library for STM32 and require Keil MDK to build and program.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Liquid_Level_Sensor Liquid Level Sensor - Waveshare Wiki]<br />
* Source revision: 68987<br />
* Captured: 2026-08-29T09:36:35+00:00<br />
* SHA-256: <code>717567c3740d68692c3c48e009b75c3f1536d54c043b5be9e73e74f43fd698b6</code></div>JWTechPublisher