#define PinButton 2
#define ledPin 12

void setup() {
 pinMode(PinButton, INPUT_PULLUP);
 pinMode(ledPin, OUTPUT);
}

void loop() {
 if (digitalRead(PinButton) == LOW){
   digitalWrite(ledPin, HIGH);
 }
 else {
  digitalWrite(ledPin, LOW);
 }
 delay(100);
}