//Button Interrupt 'Toggles'

int  pbInt = 0;    	// Push Button Interrupt 0 is on pin 2
int  toggleOn = false;  //  Button click switches state

void setup( ) {
  Serial.begin(9600);
  attachInterrupt(pbInt, handleClick, RISING);  // Register handler
}

void loop( ) {
  if ( toggleOn ) { Serial.println("on"); }
  else 		    { Serial.println("off"); }
}
void  handleClick( ) {
 static unsigned long last_intTime = 0; //  Zero only at start
  unsigned long intTime = millis( );    // Read the clock
  if (intTime - last_intTime > 200 ) {  // Ignore when < 200mS
    toggleOn = !toggleOn;
  }
  last_intTime = intTime;
}