int sensorValue = 0;  // value read from the pot

void setup() {
  pinMode(3, OUTPUT);
  digitalWrite(3, LOW);
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(2);

  
  if(sensorValue > 800){  
    digitalWrite(3, HIGH);
    delayMicroseconds(125);
    digitalWrite(3, LOW);
    delayMicroseconds(125);
  }
  // print the results to the Serial Monitor:
  Serial.print("sensor = ");
  Serial.print(sensorValue);
}