int LED1 = PB0 ;
int LED2 = PB1 ;
int LED3 = PB2 ;
int LED4 = PB3 ;
int LED5 = PB4 ;

int brightness = 0; 
int fadeAmount = 5; 


void setup() {  
   pinMode(LED1, OUTPUT);
   pinMode(LED2, OUTPUT);
   pinMode(LED3, OUTPUT);
   pinMode(LED4, OUTPUT);
   pinMode(LED5, OUTPUT);
}


void loop() {
  //  digitalWrite(LED1, HIGH); 
  //  digitalWrite(LED2, HIGH); 
  //  digitalWrite(LED3, HIGH); 
  //  digitalWrite(LED4, HIGH); 
  //  digitalWrite(LED5, HIGH); 
  //  delay(1000); 
  //  digitalWrite(LED1, LOW);
  //  digitalWrite(LED2, LOW);
  //  digitalWrite(LED3, LOW);
  //  digitalWrite(LED4, LOW);
  //  digitalWrite(LED5, LOW);
  //  delay(1000);
    

  brightness = brightness + fadeAmount;

  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  analogWrite(LED1, brightness);
  analogWrite(LED2, brightness);
  // analogWrite(LED3, brightness);
  // analogWrite(LED4, brightness);
  // analogWrite(LED5, brightness);
  delay(10);
}