//Constants
const int yellowLed = 13;
const int redLed    = 13;
const int blueLed   = 13;
const int greenLed  = 13;

//Variables
int buttonValue; //Stores analog value when button is pressed


void setup()
{
  pinMode(yellowLed, OUTPUT);
  pinMode(redLed, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
}

void loop()
{
  buttonValue = analogRead(A0); //Read analog value from A0 pin
  
  //For 1st button:
  if (buttonValue>=1000 && buttonValue<=1025){
    digitalWrite(yellowLed, HIGH);
  }
  //For 2nd button:
  else if (buttonValue>=800 && buttonValue<=820){
    digitalWrite(redLed, HIGH);
  }
  //For 3rd button:
  else if (buttonValue>=580  && buttonValue<=620){
    digitalWrite(blueLed, HIGH);
  }
  //For 4th button:
  else if (buttonValue>=390  && buttonValue<=420){
    digitalWrite(greenLed, HIGH);
  }
  //No button pressed, turn off LEDs
  else{
    digitalWrite(yellowLed, LOW);
      digitalWrite(redLed, LOW);
      digitalWrite(blueLed, LOW);
      digitalWrite(greenLed, LOW);
  }
  }