button4

int Pin =8;
int ledPin = 13;
boolean lastButton = LOW;
boolean currentButton = LOW;
boolean ledOn = false;

void setup()
{
  pinMode(Pin, INPUT);
  pinMode(ledPin, OUTPUT);
}
boolean debounce(boolean last)
{
  boolean current =digitalRead(Pin);
  if (last != current)
  {
    delay(5);
    current = digitalRead(Pin);
  }
  return current;
}

void loop()
{
  currentButton = debounce(lastButton);
  if (lastButton == HIGH && currentButton == HIGH)
  {
    ledOn = !ledOn;
  }
  lastButton = currentButton;
  digitalWrite(ledPin, ledOn);
}