#define POT A0
#define RED 5
#define GREEN 4
#define BLUE 3
int data;
float volt;
void RGB(int r, int g, int b)
{
  digitalWrite(GREEN, g);
  digitalWrite(BLUE, b);
  digitalWrite(RED, r);
}

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  data = analogRead(POT);
  Serial.print("data:");
  Serial.print(data);
  Serial.print("=");
  Serial.print(data, BIN);
  Serial.print(", voltage:");
  volt = (data / 1023.0) * 5;
  Serial.println(volt);
  volt=map(volt,0,5,0,2);
  if ( volt == 0)
  {
    //digitalWrite(GREEN, 1);
    RGB(0, 1, 0);
    //digitalWrite(BLUE, 0);
    //digitalWrite(RED, 0);
  }
  if ( volt == 1)
  {
    //digitalWrite(GREEN, 0);
    RGB(0, 0, 1);
    //digitalWrite(BLUE, 1);
    // digitalWrite(RED, 0);
  }
  if ( volt == 2)
  {
    //digitalWrite(GREEN, 0);
    RGB(1, 0, 0);
    //digitalWrite(BLUE, 0);
    // digitalWrite(RED, 1);
  }
  delay(2000);
}