#define Pin_BOUTON 3
#define Led_rouge 5
#define APPUYE LOW

void setup() {
  // put your setup code here, to run once:
  pinMode(Pin_BOUTON, INPUT_PULLUP);
  pinMode(Led_rouge, OUTPUT);
}

void loop() {
  if (digitalRead(Pin_BOUTON)==APPUYE)
  {
    digitalWrite(Led_rouge, HIGH);
  }
  else
  {
    digitalWrite(Led_rouge, LOW);
  }

}