const int LED_PIN = 4;

TimerHandle_t xTimer1;
TimerHandle_t xTimer2;

void vTimer1CallBack(TimerHandle_t xTimer) {
  static bool ledAan = false;
  ledAan = !ledAan;
  digitalWrite(LED_PIN, ledAan ? HIGH : LOW);
}

void vTimer2CallBack(TimerHandle_t xTimer) {

  static uint32_t teller = 0;
  teller++;
  Serial.print("Teller: ");
  Serial.println(teller);
}


void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(115200);

  xTimer1 = xTimerCreate(
              "LedTimer",
              pdMS_TO_TICKS(500),
              pdTRUE,
              (void*)0,
              vTimer1CallBack
            );

  xTimer2 = xTimerCreate(
              "printTimer",
              pdMS_TO_TICKS(2000),
              pdTRUE,
              (void*)0,
              vTimer2CallBack
            );

  xTimerStart(xTimer1, 0);
  xTimerStart(xTimer2, 0);
}

void loop() {}