int led = 9;
int brightness  = 0;
int fadeAmount = 5;
int buttonPin = 2;

int buttonState = 0;

void setup() {
  // put your setup code here, to run once:

  pinMode(led, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);

}


void loop() {
  // put your main code here, to run repeatedly:

  buttonState = digitalRead(buttonPin);  

  if (buttonState == HIGH){

    Serial.println("HIGH");

  }
  else
  {
      Serial.println("LOW.");

  }

  analogWrite(led, brightness);

  brightness = brightness + fadeAmount;

  if (brightness <= 0 || brightness >= 255){
fadeAmount = -fadeAmount;

  }

  delay(10);

  
  



}