Example Code for Arduino - Non - contact Liquid Level Sensor (FIT0212) Detection

This guide offers a complete walkthrough for setting up an Arduino-based liquid level detection system, including hardware and software requirements, wiring instructions, and sample code to facilitate accurate liquid level detection using a non-contact switch.

Hardware Preparation

DFRduino UNO R3 + Gravity: IO Expansion Shield (or similar) x 1
Non-contact Liquid Level Switch x 1
M-M/F-M/F-F Jumper wires

Software Preparation

Arduino IDE

Wiring Diagram

The sponge should be attached with the container

Or you can remove the sponge

Do NOT have the sponge projected outwards

Other Preparation Work

NOTE:

Please keep the container empty or keep the liquid level lower than the sensor installation place before supply power EVERY TIME.

This sensor has a power-on zero calibration. It will detect liquid level Zero position once it gains the power supply.

The sponge is to make it flexible to use most of the glue or a doble sided tape on the sponge to stick it to the non-metal container, if your container is too thick (over 8mm), you can remove the sponge and use a proper glue/ tape to fix it on the container.

Sample Code


void setup(){
  //start serial connection
  Serial.begin(9600);
  pinMode(2, INPUT);
  pinMode(13, OUTPUT);
}

void loop(){
  //read the switch value into a variable
  int sensorVal = digitalRead(2);
  //print out the value of the liquid level
  Serial.println(sensorVal);
  if (sensorVal == HIGH) {
    digitalWrite(13, LOW);
  }
  else {
    digitalWrite(13, HIGH);
  }
}

Result

Check the detection result

Example Code for Arduino-Liquid Level Detection