Example Code for Arduino-Digital Output

Hardware Preparation

Connect an LED on pin 13, or use the onboard one; Connect turbidity sensor to Digital Pin 2

Wiring Diagram

Interface Description:

1. "D/A" Output Signal Switch
   • "A": Analog Signal Output, the output value will decrease when in liquids with a high turbidity
   • "D": Digital Signal Output, high and low levels, which can be adjusted by the threshold potentiometer
2. Threshold Potentiometer: you can change the trigger condition by adjusting the threshold potentiometer in digital signal mode.

Sample Code

int ledPin = 13;                // Connect an LED on pin 13, or use the onboard one
int sensor_in = 2;                 // Connect turbidity sensor to Digital Pin 2

void setup(){
  pinMode(ledPin, OUTPUT);      // Set ledPin to output mode
  pinMode(sensor_in, INPUT);       //Set the turbidity sensor pin to input mode
}

void loop(){
  if(digitalRead(sensor_in)==LOW){       //read sensor signal
    digitalWrite(ledPin, HIGH);   // if sensor is LOW, then turn on
  }
  else{
    digitalWrite(ledPin, LOW);    // if sensor is HIGH, then turn off the led
  }
}

Result

If sensor is LOW, then turn on the LED; if sensor is HIGH, then turn off the led