Increase and Decrease LED with button

gistfile1.ino

/* 
  Increase LED Brightness with long press, Lower LED brightness with short press

  Holding down the button with increase the brightness continuously.
  A short press of the button will decrease the brightness by 20%
 
  created 2012
  by Aaron Van Bokhoven
*/

const int buttonPin = 2;           // number of the button pin
const int ledPin = 9;              // number of the LED pin

float brightness = 0;              // brightness of LED starts at 0
int fadeAmount = 51;               // fadeAmount is equal to 20% of 255(max LED brightness)
float buttonPressedCounter = 0.0;  // timer set to 0 whe depressing button

void setup() {
  // set button as input
  pinMode(buttonPin, INPUT);
  // set LED as output
  pinMode(ledPin, OUTPUT);
  // init serialize communication at 9600 bits per second
  Serial.begin(9600);
}

void loop() {
  // activate when button is being held down
  if (buttonState == HIGH) {
    // on press, when counter is greater than 33, assume button is being held down
    if (buttonPressedCounter > 33) {
      // button was held down for longer than 33
      if (brightness < 255) {
        Serial.print("increasing brightness: ");
        Serial.println(brightness);
        brightness = brightness + 5;
        analogWrite(ledPin, brightness);
      }
    } else {
      buttonPressedCounter ++;
      Serial.print("holding: ");
      Serial.println(buttonPressedCounter);
    }
  } else if (buttonState == LOW) {
    // on release if button pressed counter was less than 33, assume it was a short press
    if ((buttonPressedCounter < 33) & (buttonPressedCounter != 0)) {
      Serial.print("lower LED: ");
      if (brightness - fadeAmount < 0.0) {
        brightness = 0;
      } else {
        brightness = brightness - fadeAmount;
      }
      Serial.println(brightness);
      analogWrite(ledPin, brightness);
    }
    buttonPressedCounter = 0;
  }
}