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9525 – Liquid Level 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 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.

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Technical overview

  • Detection range: 48 mm immersion depth
  • Supply voltage: 2.0 V to 5.0 V (pinout note: 3.3 V–5.0 V)
  • Dimensions: 19.0 mm × 63.0 mm
  • Mounting hole diameter: 2.0 mm
  • Output type: Analog output on AOUT
  • 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.
  • Pinout: AOUT (analog out), GND (ground), VCC (power)
  • Pico connection: VCC → 3.3 V, GND → GND, AOUT → GP26
  • STM32 connection (F103RB example): VCC → 3.3 V, GND → GND, AOUT → PA6
  • Arduino UNO connection: VCC → 5 V, GND → GND, AOUT → A0

Commands and examples – verify before use:  

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/a/a0/Liquid-Level-Sensor-code.7z
7z x Liquid-Level-Sensor-code.7z -o./Liquid-Level-Sensor-code
cd ~/Liquid-Level-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

  • Example projects are based on STM32F103RBT6 and STM32H743; other STM32 boards require adapting connections and code.
  • For Arduino boards other than UNO, compatibility must be verified by the user.
  • If the output value does not change after flashing, the threshold voltage may be set too high; reduce it to an appropriate value.
  • Flashing the Pico requires holding the BOOTSET button during USB connection so the RPI_RP2 disk appears.
  • The provided examples use the HAL library for STM32 and require Keil MDK to build and program.

Source and revision record

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