int vr = A0;
int red = 5;
int green = 6;
int blue = 7;

void setup() {

  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  int vrColor = analogRead(vr);
  Serial.println(vrColor);
  if
   (vrColor >= 0 && vrColor < 400) {
    analogWrite(red, 100);
    analogWrite(green, 149);
    analogWrite(blue, 237);
  } 
  else if

   (vrColor >= 400 && vrColor < 800) {
    analogWrite(red, 0);
    analogWrite(green, 255);
    analogWrite(blue, 0);

  } 
  else if

   (vrColor >= 800 && vrColor <= 1023) {
    analogWrite(red, 255);
    analogWrite(green, 165);
    analogWrite(blue, 0);
  }
}