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Interfacing of Arduino with Soil Moisture Sensor :

interfacing

ARDUINO CODE

int Sensor = 0;
int data = 0; 

void setup(){
  pinMode(A0, INPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  Serial.begin(9600);
}

void loop(){
  Sensor = analogRead(A0);
  data = map(Sensor,0, 1023, 0, 255);
  Serial.println(data);
  
  if (data < 60){
     digitalWrite(9,0);
    digitalWrite(10,0);
    digitalWrite(11,1);
  }
  
  if (data > 60 && data < 150){
    digitalWrite(9,0);
    digitalWrite(10,1);
    digitalWrite(11,0);
  }
  if (data > 150){
     digitalWrite(9,1);
    digitalWrite(10,0);
    digitalWrite(11,0);
  }
}

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