Programmation ARDUINO

CompteARebour = CompteARebour -1; 

int buttonState = 0;         // defini a 0

void setup() {
  //  LED pin output:
  pinMode(ledPin, OUTPUT);      
  // button pin  input:
  pinMode(buttonPin, INPUT);     
}

void loop(){
  // regarde l'etat du button:
  buttonState = digitalRead(buttonPin);

  // verifie si le boutton est pressé.
  // SI le button est pressé:
  if (buttonState == HIGH) {     
    // LED on:    
    digitalWrite(ledPin, HIGH);  
  } 
  else {
    //SINON LED off:
    digitalWrite(ledPin, LOW); 
  }
}