void setup() {
  #define led1 2
  #define led2 3
  #define led3 4
  #define led4 5
  #define POT A5

  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT);
  pinMode(led4,OUTPUT);
  pinMode(POT,INPUT);

  Serial.begin(9600);

}

void loop() {
  int val = analogRead(POT);
  Serial.println(val);
  int level = map(val,0,1023,0,255);
  if(level >= 200){
  analogWrite(led1,level);
  analogWrite(led2,level+10);
  analogWrite(led3,level+20);
  analogWrite(led4,level+30);
  
  }

  else  if(level >= 150)
  {
    analogWrite(led1,level);
    analogWrite(led2,level+10);
    analogWrite(led3,level+20);


  }
  
  else  if(level >= 100)
  {
    analogWrite(led1,level);
    analogWrite(led2,level+10);
  }


}