Example Code for Arduino-Liquid Level Detection

Hardware Preparation

• DFRduino UNO R3 (or similar) × 1
• 5V Non-contact Liquid Level Sensor × 1

Software Preparation

Arduino IDE

Wiring Diagram

Sample Code

 /*!
 * @File  Infrared_Approach_Sensor.ino
 * @brief  Detect the status of IO3 and print it in serial port
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence  The MIT License (MIT)
 * @version  V1.0
 * @date  2021-03-15
 */
int  OUT = 3;
int  i = 0;
void setup()
{
  Serial.begin(9600);
  pinMode(OUT, INPUT);
}
void loop()
{
   i = digitalRead (OUT);
   Serial.println(i);
   delay(5);
}

Result

Read the status of IO3 in real time. When the sensor detects the existence of a liquid at a particular level in a container, the serial port prints 0. Otherwise, the serial port prints 1.