//GLOBAL VARIABLE-----------------------------------------------------
SemaphoreHandle_t xBS; //binary semaphore handler
#define LED 4
#define ADC_pin 13
float Vin, Vthreshold = 1.95;

//TASKS---------------------------------------------------------------
void TaskA(void *pt) {
  while (1) {
    xSemaphoreTake( xBS, portMAX_DELAY );
    Vin = analogReadMilliVolts(ADC_pin)/1000.0; //Convert mV to V
    xSemaphoreGive( xBS );
    delay(500);
  }
}

void TaskB(void *pt) {
  while (1) {
    xSemaphoreTake( xBS, portMAX_DELAY );
    Serial.println(Vin);
    xSemaphoreGive( xBS );
    delay(500);
  }
}

void TaskC(void *pt) {
  pinMode(LED, OUTPUT);
  while (1) {
    xSemaphoreTake( xBS, portMAX_DELAY );
    Vin>Vthreshold? digitalWrite(LED, LOW) : digitalWrite(LED, HIGH); //Check condition, can use If...else
    xSemaphoreGive( xBS );
    delay(500);
  }
}

//SETUP----------------------------------------------------------------
void setup() {
  Serial.begin(115200); //baud rate
  xBS = xSemaphoreCreateBinary();
  xTaskCreatePinnedToCore(TaskA, "ADC", 2048, NULL, 3, NULL, 1);
  xTaskCreatePinnedToCore(TaskB, "UART", 2048, NULL, 2, NULL, 1);
  xTaskCreatePinnedToCore(TaskC, "LED", 1024, NULL, 1, NULL, 1);
  xSemaphoreGive(xBS); // Release semaphore
  Serial.println("Begin operation...");
}

void loop() { }