Tasker (Scheduler)

Tasker is an Arduino library that enables execution of multiple fragments of code recurrently with different intervals.

What is the purpose?

The purpose of this library is to simplify writing Arduino programs that simulate working on a multi-core environment. It can be achieved by dividing different functionalities into separate tasks (functions) and telling Tasker how often they should be executed. It enables you to easily make complex programs that will be very transparent (see examples and check how easy it is).

How to use it?

Installation

If you don't know how to add libraries to Arduino check out this website: https://www.arduino.cc/en/guide/libraries

Use in code

To use this library include Tasker to your code

#include <Tasker.h>

Then create your Tasker instance

Tasker tasker(MaxTasksAmt);

MaxTasksAmt is the maximum amount of tasks added to the tasker at the same time ("concurrent" tasks).

Then it is time to create your tasks. As you can see it is very simple

class ExampleTask1 : public IExecutable
{
    void execute() override
    {
        // Your actions inside
        Serial.println("Executed example task 1!");
    }
};

Each task is a new class that extends IExecutable class (interface). Put your actions inside the execute() method. This is just a normal class so for example you can add some private variables and even other methods. Then create your task instance

ExampleTask1 exampleTask1;

If you don't want to write your own constructor and you just want to create a task this is the simplest way

class : public IExecutable
{
    void execute() override
    {
        // Your actions inside
        Serial.println("Executed example task 1!");
    }
} exampleTask1;

Of course you can create multiple classes that represent different tasks. The next step is to add your tasks to the Tasker instance for example inside the setup() method. In order to do this use addTask_Hz() (and tell Tasker execution frequency of your task) or addTask_us() (and tell Tasker interval between next executions in microseconds).

void setup()
{
    tasker.addTask_Hz(&exampleTask1, 2.f);  // 2Hz -> two times per second
    // or
    tasker.addTask_us(&exampleTask1, 500000L);  // (2Hz) 500000us = 1000000us / 2 -> every two seconds
}

Now the only thing that left you is to call the Tasker loop() method inside the arduino loop(). This should be the only thing there.

void loop()
{
    tasker.loop();
}

That's all. As you can see, this is really simple.

This is part of the Tasker_example from examples. Run it on your arduino and play around!