/*

  Analog input, analog output, serial output

  Reads an analog input pin, maps the result to a range from 0 to 255 and uses

  the result to set the pulse width modulation (PWM) of an output pin.

  Also prints the results to the Serial Monitor.

  The circuit:

  - potentiometer connected to analog pin 0.

    Center pin of the potentiometer goes to the analog pin.

    side pins of the potentiometer go to +5V and ground

  - LED connected from digital pin 9 to ground

  created 29 Dec. 2008

  modified 9 Apr 2012

  by Tom Igoe

  This example code is in the public domain.

  http://www.arduino.cchttps://www.arduino.cc/en/Tutorial/AnalogInOutSerial

*/

// These constants won't change. They're used to give names to the pins used:

const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to

const int redled = 12; // Analog output pin that the LED is attached to
const int greenled = 13;

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

float potVoltage = 0;

// value output to the PWM (analog out)

void setup() {

pinMode (redled, OUTPUT);
pinMode (greenled, OUTPUT);

  // initialize serial communications at 9600 bps:

  Serial.begin(9600);
}

void loop() {

  // read the analog in value:

  sensorValue = analogRead(analogInPin);

  // map it to the range of the analog out:

  outputValue = map(sensorValue, 0, 1023, 0, 255);

  // change the analog out value:
  potVoltage = map(sensorValue, 0, 1023, 0, 500)/100.0;

  if(potVoltage <= 1.0)
  {
    digitalWrite(greenled, LOW);
    digitalWrite(redled,LOW);
  }
  if(potVoltage > 1.0 && potVoltage <= 2.0)
  {
    digitalWrite(greenled, HIGH);
    digitalWrite(redled, LOW);
  }
  if(potVoltage > 2.0 && potVoltage <= 3.0)
  {
    digitalWrite(greenled, HIGH);
    digitalWrite(redled, HIGH);
  }
  if(potVoltage > 3.0)
  {
    digitalWrite(greenled, LOW);
    digitalWrite(redled, HIGH);
  }
  Serial.print("Voltage = ");
  Serial.println(potVoltage);
  delay(250);
}