(Arduino study) LED brightness control by switch connection

The source code is combine of Brightness changing(http://feelmare.blogspot.kr/2013/12/arduino-study-led-brightness-changing.html) and LED turn on/off(http://feelmare.blogspot.kr/2013/12/arduino-led-onoff-using-switch-aduino.html).


The LDE brightness is changed when switch is connected.

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const int LED=9;
const int BUTTON = 7;

int val = 0;

int old_val = 0;
int state = 0;

int brightness = 128;
unsigned long startTime = 0;

void setup(){
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT);
}

void loop()
{
  val = digitalRead(BUTTON);
  
  if( (val == HIGH) && (old_val == LOW) ){
    state = 1-state;
    startTime = millis();
    delay(10);
  }
  
  
  if( (val == HIGH) && (old_val==HIGH) ){
    
    if(state == 1 && (millis() - startTime) > 500 ){
      
      brightness++;
      delay(10);
      
      if(brightness > 255){
        brightness=0;
      }
    }
  }
  
  
  old_val = val;
  if(state == 1)
  {
    analogWrite(LED, brightness);
  }
}

////