Example Code for Arduino-Liquid Level Detection

Hardware Preparation

• DFRduino UNO R3 x 1
• Gravity: IO Expansion Shield for Arduino V7.1 x1
• Miniature Non-contact Liquid Level Sensor x1

Software Preparation

• Arduino IDE

Wiring Diagram

Sample Code

int liquidLevel = 0;

void setup()
{
  Serial.begin(9600);
  pinMode(5, INPUT);
}

void loop()
{
  liquidLevel = digitalRead(5);
  Serial.print("liquidLevel= "); 
  Serial.println(liquidLevel, DEC);
  delay(500);
}

Result

When a liquid level is detected, liquidLevel = 1; when no liquid level is detected, liquidLevel = 0.