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);

}