int led = 9;
int brightness = 0;
int fadeamount = 5;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(led,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
analogWrite(led, brightness);
brightness =  brightness + fadeamount ;

if(brightness <= 0 || brightness >= 255){
  fadeamount = -fadeamount;
  Serial.println("Flip ");
}
delay(100);
}