#include <Arduino_FreeRTOS.h> 
#include <semphr.h> 

SemaphoreHandle_t mutex_v; 
void setup() { 
    Serial.begin(9600); 
    mutex_v = xSemaphoreCreateMutex(); 
    if (mutex_v == NULL) { 
        Serial.println("Mutex can not be created"); 
    } 
    pinMode(2, INPUT_PULLUP);
    xTaskCreate(Task1,  "Led", 128, NULL, 0, NULL );
    xTaskCreate(Task2,  "LedBlink", 128, NULL, 0, NULL );
} 

void Task1(void *pvParameters) { 
    while(1) { 
      pinMode(8, OUTPUT);
        xSemaphoreTake(mutex_v, portMAX_DELAY); 
        digitalWrite(8, HIGH);
        Serial.println("Hi from Task1"); 
        xSemaphoreGive(mutex_v);
        digitalWrite(8, LOW); 
        vTaskDelay(pdMS_TO_TICKS(2000)); 
    } 
} 

void Task2(void *pvParameters) { 
    while(1) { 
      pinMode(7, OUTPUT);
        xSemaphoreTake(mutex_v, portMAX_DELAY);
        digitalWrite(7, HIGH); 
        Serial.println("Hi from Task2"); 
        xSemaphoreGive(mutex_v); 
        digitalWrite(7, LOW); 
        vTaskDelay(pdMS_TO_TICKS(1000)); 
    } 
} 

void loop() { 
}