Arduino : Switch Press&Release

gistfile1.txt

void setup() 
{
  pinMode(3,INPUT_PULLUP);
  pinMode(13,OUTPUT);
}

void loop() 
{
  //the following block of code will check a NO button switch for press & release
//----------------------------------------------------------------------------------
  bool buttonReleased=false;
  if(!digitalRead(3))
  {
    while(!buttonReleased)
    {
      delay(2); //delay added to avoid switch bouncing problem
      if(digitalRead(3)) buttonReleased = true;
    }
  }
//----------------------------------------------------------------------------------
  //things to do only when button is released
  //here we blink a LED 5 times
  
  if(buttonReleased)
  {
    for(byte i=0;i<5;i++)
    {
      digitalWrite(13,HIGH);
      delay(500);
      digitalWrite(13,LOW);
      delay(500);
    }
  }
}