struct Task {
  const char* name;
  unsigned long executionTime;
  unsigned long period;
  unsigned long lastRun;
};

Task tasks[] = {
  {"Tache1",100,300,0},
  {"Tache2",200,500,0},
  {"Tache3",50,700,0}
};

const int numTasks = sizeof(tasks)/ sizeof(tasks[0]);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  unsigned long currentTime = millis();

  for (int i = 0; i< numTasks ; i++){
    if(currentTime - tasks[i].lastRun >= tasks[i].period){
      Serial.print("l'Exécution de ");
      Serial.println(tasks[i].name);

      delay(tasks[i].executionTime);

      tasks[i].lastRun = currentTime;
    }
  }
}