Build Instructions

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  Run a Program

  int greenLed = 2;
  int yellowLed = 3;
  int redLed = 4;

  int analogValue = 0; // analogValue variable is where we will be storing the value that comes from the analog input//
  float voltage = 0;
  int ledDelay = 1000; //ledDelay is how long you want the LEDs to remain on before switching off//

  //set up all our LED pins as outputs//

  void setup()
  {
  pinMode(greenLed, OUTPUT);
  pinMode(yellowLed,OUTPUT);
  pinMode(redLed,OUTPUT);
  }

  // Read the analog pin //

  void loop()
  {
  analogValue = analogRead(A0);
  voltage = 0.0048*analogValue;
  

  //Compare calculated voltage with defined voltage values//
  
  if( voltage >= 1.6 )
       digitalWrite(greenLed, HIGH);
  else if (voltage > 1.2 && voltage < 1.6)
       digitalWrite(yellowLed, HIGH);
  else if( voltage <= 1.2)

       digitalwrite(redled, HIGH);

   delay(leddelay);

   digitalWrite(redLed, LOW);

  digitalWrite(yellowLed, LOW);

  digitalWrite(greenLed, LOW);

  }

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