arduino кнопка

#define led 13
#define pin12 12

// the setup routine runs once when you press reset:
void setup() {
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);
  pinMode(pin12,INPUT);
// Serial.begin(9600);
}
// the loop routine runs over and over again forever:
void loop() {
  int value=digitalRead(pin12);
  digitalWrite(led, value);
 }