const int green = 21; 
const int blue = 19; 
const int red = 18; 


void task1(void * parameters) {
for(;;){
digitalWrite(red, HIGH);
vTaskDelay(1000 / portTICK_PERIOD_MS);
digitalWrite(red, LOW);
vTaskDelay(500 / portTICK_PERIOD_MS);
}
}

void task2(void * parameters) {
for(;;){
digitalWrite(blue, HIGH);
vTaskDelay(500 / portTICK_PERIOD_MS);
digitalWrite(blue, LOW);
vTaskDelay(250 / portTICK_PERIOD_MS);
}
}

void task3(void * parameters) {
for(;;){
digitalWrite(green, HIGH);
vTaskDelay(150 / portTICK_PERIOD_MS);
digitalWrite(green, LOW);
vTaskDelay(75 / portTICK_PERIOD_MS);
}
}

void setup() {
  pinMode(red, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(green, OUTPUT);

xTaskCreate(
task1, 
"Task 1", 
1000, 
NULL, 
1, 
NULL 
);

xTaskCreate(
task2, 
"Task 2", 
1000, 
NULL, 
2, 
NULL 
);

xTaskCreate(
task3, 
"Task 3", 
1000, 
NULL, 
3, 
NULL 
);
}

void loop() {

}