#define LED_VERTE PB0
#define LED_JAUNE PB1
#define LED_ROUGE PB2

void setup() {
  pinMode(LED_VERTE, OUTPUT);
  pinMode(LED_JAUNE, OUTPUT);
  pinMode(LED_ROUGE, OUTPUT);
}

void loop() {
  digitalWrite(LED_VERTE, HIGH);
  digitalWrite(LED_JAUNE, LOW);
  digitalWrite(LED_ROUGE, LOW);
  delay(3000);
  digitalWrite(LED_VERTE, LOW);
  digitalWrite(LED_JAUNE, HIGH);
  digitalWrite(LED_ROUGE, LOW);
  delay(1000);
  digitalWrite(LED_VERTE, LOW);
  digitalWrite(LED_JAUNE, LOW);
  digitalWrite(LED_ROUGE, HIGH);
  delay(3000);
}