// int redLED=13;
// int brightness=255;

// void setup() {
//   // put your setup code here, to run once:
// // Understanding the Arduino Analog Write Command//
// pinMode(redLED , OUTPUT); 
// }

// void loop() {
//   // put your main code here, to run repeatedly:
// analogWrite(redLED  , brightness);
// }

int redLED=13;
int brightness=0;
int fadeamount=5;
void setup(){
  pinMode(redLED , OUTPUT);
}
void loop(){
  analogWrite(redLED , brightness);
  brightness=brightness+fadeamount;
  if(brightness<=0 || brightness>=255){
    fadeamount=-fadeamount;
  }
delay(300);
}