// déclare les broches
const int LED1 = 0;
const int LED2 = 1;

// miniseconde entre changement d'état
const unsigned int LED_INTERVAL_1 = 1000;
const unsigned int LED_INTERVAL_2 = 250;

// Précedente valleur de millis() LED 1 & 2
unsigned long previousMillisLED1 = 0;
unsigned long previousMillisLED2 = 0;

// Précédent état LED 1 & 2
byte etatBrocheLED1 = LOW;
byte etatBrocheLED2 = LOW;

void setup() {
 pinMode(LED1, OUTPUT);
 pinMode(LED2, OUTPUT);
digitalWrite(LED1, etatBrocheLED1);
digitalWrite(LED2, etatBrocheLED2);
 
}

void loop() {
 unsigned long currentMillis = millis();
 if(currentMillis - previousMillisLED1 >= LED_INTERVAL_1){
  previousMillisLED1 = currentMillis;
  etatBrocheLED1 = !etatBrocheLED1;
  digitalWrite(LED1, etatBrocheLED1);
  }
  if(currentMillis - previousMillisLED2 >= LED_INTERVAL_2){
    previousMillisLED2 = currentMillis;
    etatBrocheLED2 = !etatBrocheLED2;
    digitalWrite(LED2, etatBrocheLED2);
    }

}