int value;
#define ledR 13
#define ledG 12
#define ledB 11
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(ledR, OUTPUT);
  pinMode(ledG, OUTPUT);
  pinMode(ledB, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  value=analogRead(A0);
  Serial.println(value);
  if(value<400){
    digitalWrite(ledR, LOW);
    digitalWrite(ledG, HIGH);
    digitalWrite(ledB, HIGH);
  }
  else if(value>400&value<800){
    digitalWrite(ledR, HIGH);
    digitalWrite(ledG, LOW);
    digitalWrite(ledB, HIGH);    
  }
  else if(value>800){
    digitalWrite(ledR, LOW);
    digitalWrite(ledG, HIGH);
    digitalWrite(ledB, LOW);    
  }
  else{
    digitalWrite(ledR, HIGH);
    digitalWrite(ledG, LOW);
    digitalWrite(ledB, HIGH);    
  }
  delay(1000);
}