const int led=2;
const int button=15;
boolean buttonSate=HIGH;

Void setup()
{
  pinMode(led,OUTPUT);
  pinMode(button,INPUT_PULLUP);
}
void loop()
{
  if(digitalRead(button)==LOW){
    if(buttonState==HIGH){
      digitalWrite(led,digitalRead(led));
      buttonState=LOW;
      delay(500);
    }
  }else{
    buttonSate=HIGH;
  }
}