const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int led4 = 5;
const int led5 = 6;
const int led6 = 7;
const int led7 = 8;
const int led8 = 9;
int leds = 0;
void setup() 
{

pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);
pinMode(led7, OUTPUT);
pinMode(led8, OUTPUT);

}

void keterang(){
  for(leds = 0; leds <= 255; leds += 3){
    analogWrite(led2, leds);
    delay(200);
  }

  for(leds = 255; leds >= 0; leds -= 3){
    analogWrite(led2, leds);
    delay(200);
  }
}



void loop() 
{

keterang();

}