void setup() {
  Serial.begin (9600);
  pinMode (5, INPUT_PULLUP);
  pinMode (3, OUTPUT); // put your setup code here, to run once:

}

void loop() {
  bool tasterstatus = digitalRead (5) ;
  tasterstatus = !tasterstatus ; 
  digitalWrite (3, tasterstatus); 
  Serial.println (tasterstatus);// put your main code here, to run repeatedly:

}