int ledp = 10, ledc = 11, ledy = 12, ledd = 13;
int buzzer = 9, potpin = A0;
int value;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledp, OUTPUT);
pinMode(ledc, OUTPUT);
pinMode(ledy, OUTPUT);
pinMode(ledd, OUTPUT);
pinMode(buzzer, OUTPUT);
pinMode(potpin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
value = analogRead(potpin);
tone(buzzer, value);
if(value > 200){
  digitalWrite(ledp, HIGH);
}else{
  digitalWrite(ledp, LOW);
  }

if(value > 400){
  digitalWrite(ledc, HIGH);
  }else{
    digitalWrite(ledc, LOW);
  }
if(value > 600){
  digitalWrite(ledy, HIGH);
  }else{
    digitalWrite(ledy, LOW);
  }
if(value > 1000){
  digitalWrite(ledd, HIGH);
  }else{
    digitalWrite(ledd, LOW);
  }
}