Liquid Level Sensor

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Liquid Level Sensor
Liquid-Level-Sensor

Liquid Level Sensor
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Primary Attribute
Category: Sensor, Moduiles
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Brand: Waveshare
Website
International: Waveshare website
Chinese: 官方中文站点
Onboard Interfaces
AD
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Feature

  • Output voltage boosts along with the immersion depth of the module

Specification

  • Detection depth: 48mm
  • Power: 2.0V ~ 5.0V
  • Dimension: 19.0mm * 63.0mm
  • Mounting holes size: 2.0mm

Pinouts

PIN Description
AOUT Analog output
GND Ground
VCC Power input (3.3V-5.0V)

Configure Pico

MicroPython and C examples are provided for this sensor, to use it with Pico, you need to first flash firmware to the Pico according to the example.
Please refer to the guides of Raspberry Pi about how to flash the firmware. We recommend you use the firmware from the Demo codes archive.

Hardware connection

Hardware Connection-Pico
Hall Pico Description
VCC 3.3V Power input
GND GND Ground
AOUT GP26 Analog data output

Examples

Download the example

Open the terminal of Raspberry Pi and run the following command to download the example:

sudo apt-get install p7zip-full
cd ~
sudo wget  https://www.waveshare.com/w/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
cd Pico/c/build/

C

Here we use the Raspberry Pi board to flashing the Pico.

  • Compile the c examples
    • Go into the directory of C examples
cd ~/Liquid-Level-Sensor-code/Pico/c/
  • Go into the build folder and add the sdk; ../../pico-sdk is the path of the SDK, if may be different if you have saved the SDK in other path.
cd build
export PICO_SDK_PATH=../../pico-sdk
  • Generate Makefile by cmake command
cmake ..
  • Compile the codes by command make
make -j9
Note: If you use Pi zero, please run make only.
  • After compiling, a uf2 file is generated.
    • Hold the button of Pico board, connect the Pico board to Raspberry Pi by USB cable
    • After connecting, release the button and a portable disk (RPI_RP2) is recognized.
    • Copy the main.uf2 file generated which locates in build folder to the portable disk (RPI-RP2)
cp main.uf2 /media/pi/RPI-RP2/

Python examples

In windows PC
  • Hold the BOOTSET button of the PICO board, connect the Pico board to Raspberry Pi by USB cable
    • After connecting, release the button and a portable disk (RPI-RP2) is recognized.
  • Copy the rp2-pico-20210418-v1.15.uf2 file to the portable disk (RPI-RP2).
  • Open the Thonny IDE (Please install the newest version which supports Pico board or update).
  • Choose Tools -> Options ->Interpreter, choose the Pico and the port
Pico-lcd-0.96-img-config.png
  • Download the demo codes, unzip and find the MicroPython example
  • Choose File -> Open -> Liquid Level Sensor.py and run it.
Pico-lcd-0.96-img-run.png
In Raspberry Pi
  • Flash the uf2 file to the Pico board just like in the Windows PC
  • Open the Thonny IDE of Pi, make sure that it is the newest version, or update it.
  • Choose Tools -> Options... -> Interpreter
    • Choose Pico and the Port
Pico-lcd-0.96-img-config2.png
  • If your Thonny IDE cannot support the Pico board, you can update it and try again.
sudo apt upgrade thonny
  • Choose File -> Open... -> python/Liquid Level Sensor.py and run it.

Expected result

When the module is inserted into water, the serial port outputs data. The higher the water level, the greater the data.

The examples provided are based on the STM32F103RBT6 and the STM32H743, the connection provided is based on the STM32F103RB.
If you want to use other STM32 boards, please change the connection and you may need to port the codes yourself.

Hardware connection

Hardware connection-STM32
Connect to STM32F103RBT6
Liquid STM32 Description
VCC 3.3V Power input
GND GND Ground
AOUT PA6 Analog data output

Examples

The examples are based on the HAL library. Please download the demo codes, unzip them and find the STM32 examples.

  • Open the project from Liquid-Level-Sensor-code\STM32\STM32F103RB\MDK-ARM by Keil.
  • Build the project and program it to the STM32 board.
  • connect the UART1 of the STM32 board to the PC and check the serial data by SCCOM software.
Liquid Level STM32 3.png

Expected result

When the module is inserted into water, the serial port outputs data. The higher the water level, the greater the data.

The examples provided are based on the Arduino UNO, if you need to use other Arduino boards, please check if the board is compatible with the UNO.

Hardware connection

Hardware connection-Arduino
Connect to Arduino UNO
Liquid Arduino Description
VCC 5V Power input
GND GND Ground
AOUT A0 Analog data output

Examples

  • Please download and install Arduino IDE to your PC.
  • Download the demo codes, unzip and find the Arduino examples
  • Open the Liquid_Level_Sensor.ino file by the Arduino IDE
  • Build and upload the codes to the UNO board
  • After uploading, you can open the Serial Monitor of IDE and check the data

Expected result

When the module is inserted into water, the serial port outputs data. The higher the water level, the greater the data.

FAQ

Question:
Why does the liquid level sensor output a same value in the test after downloading the relative Demo to the development board?
Answer:
The possible reason may be the threshold voltage is set too large. In this case, please modify the threshold voltage setting to a proper value.


Question:
What does the liquid level sensor output, analog data or digital data?
Answer:
The liquid level sensor outputs analog data. And an AD convertor is required on sampling.


Question:
What other choices do I have?
Answer:
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UV Sensor

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Support

If you require technical support, please go to the Support page and open a tickets.