int led1 = 9 ;
int led2 = 10 ;
int led3 = 11 ;
int pot = A0;

void setup() {
  // put your setup code here, to run once:

  pinMode(led1 , OUTPUT);
  pinMode(led2 , OUTPUT);
  pinMode(led3 , OUTPUT);
  pinMode(pot , INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  
  int p = analogRead(pot);
  int po = map(p,0,1023,0,255);
  analogWrite(led1,po);
    analogWrite(led2,po);
      analogWrite(led3,po);
      delay(10);

}