Non-contact Capacitive Liquid Level Sensor Arduino Wiki - DFRobot

This is a non-contact liquid level sensor with status indicator and adjustable sensitivity. It can be used in liquid detection of non-metallic container or pipe(outer diameter>11mm), suitable for all types of detection of curved or flat surfaces, arcs, cylindrical containers or piping fluids. The status feedback of the sensor can be given in real-time. Besides that, the sensor comes with a 4pin sensor adaptor that can directly collect digital signal, convenient for connecting with Arduino or other main-controllers. This liquid level sensor can be widely used in liquid detection of a tank, water dispenser, etc.

Specification

• Power Supply: 5~12V
• Output: switch quantity
• Response Time: 500ms
• Operating Temperature: -5~105°C
• Suitable Container Outer Diameter: ≥11mm
• Liquid Level Error: ±1.5mm
• Material: ABS
• Waterproof Performance: IP65

Board Overview

Liquid Level Sensor with Cable Adapter Module

Method for instal jumper cap of switch board

Connection DOWN is pull-down and connection UP is pull-up.

4P Adapter Pinout

Dimensional Drawing

Liquid level detection of flat non-metal container

Sensitivity Adjustment

Use a screwdriver to rotate the sensitivity knob(on the right of the sensor) anti-clockwise to increase the sensitivity; rotate clockwise to decrease it.

Tutorial

Requirements

• Hardware
  • DFRduino UNO R3 (or similar) x 1
  • Non-contact Capacitive Liquid Level Sensor x1
  • Wires
  • Software
    • Arduino IDE

    Arduino Debug

    The liquid level sensor will output high/low level to determine the liquid level of a container, and its status can be checked via serial monitor.

    Connection Diagram

    

    Sample Code

    /*! * @File DFRobot_LevelSensor.ino * @brief Detecting the liquid level of non-metallic containers,and check the status of sensor through serial port * @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com) * @licence The MIT License (MIT) * @author [liunian](nian.liu@dfrobot.com) * @version V1.0 * @date 2020-08-13 */ int inPin = 8; boolean running = 0;//when running=1, the liquid is detected, print out 1, otherwise, print out 0; running=0, the liquid is detected, print out 0, otherwise, print out 1. int modePin = 9; void setup() < Serial.begin(9600); pinMode(inPin, INPUT); pinMode(modePin, OUTPUT); digitalWrite(modePin, running); >void loop()

    Function: when running=1, the liquid is detected, print out 1, otherwise, print out 0; running=0, the liquid is detected, print out 0, otherwise, print out 1.

    Expected Results

    

    FAQ

    1. The liquid level sensor doesn't work when powered on (the indicator keeps off when the liquid level reached the sensing point, and it has no response to the sensitivity adjustment.).
       1) The sensor may not be in a good connection with the power source, please check the power connection.
       2) The power cable may be reversely connected, please check it.
       3) The power module is broken, change the power module and try again.
       4) The sensitivity may be too low, increase the sensitivity to a suitbale value.
    2. The indicator keeps on all the time.
       1) The sensitivity is too high, please adjust it to a suitabe value.
       2) The init parameter is revised abnormally, in this case the sensor needs to be returned to the factory for restarting init.
       3) There are impurities or other metal objects contacted with the sensor closely, please clean the sensor and keep it away from any metal objects.

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