const byte brocheBouton = 13;
const byte brocheLed1 = 7;
const byte brocheLed2 = 9;

void setup() {
  pinMode(brocheBouton, INPUT_PULLUP);
  pinMode(brocheLed1, OUTPUT);
  pinMode(brocheLed2, OUTPUT);
}

void loop() {
  if (digitalRead(brocheBouton) == LOW) { // LOW = appuyé car INPUT_PULLUP
    digitalWrite(brocheLed1, HIGH);
    digitalWrite(brocheLed2, LOW);
    delay(500); // 500 ms = 0,5 s
    digitalWrite(brocheLed1, LOW);
    digitalWrite(brocheLed2, HIGH);
    delay(500);
  }
}