Arduino Mini OS with WiFi REST API

This project demonstrates a simple OS for Arduino that has a task scheduler using the Arduino Uno R4 WiFi (or similar boards) that can run multiple tasks on a periodic basis. It includes a REST API to start, stop, toggle, and view tasks over WiFi. A blinking LED and serial console printing are implemented as example tasks.

Features

Multi-task scheduler with:

Task start, stop, and toggle functionality.

Tracking of last and next execution times.

Example tasks:

Blinker: Toggles an LED periodically.

SerialPrinter: Prints task info to the serial monitor periodically.

WiFi Access Point mode with REST API:

View all tasks (/tasks).

View task status (/tasks/status).

Start, stop, or toggle tasks by ID (/tasks/start/, /tasks/stop/, /tasks/toggle/).

Get detailed task info (/tasks/info/).

JSON-based API responses for easy integration.

Hardware Requirements

Arduino Uno R4 WiFi (or compatible board with WiFiS3 library support)

LED on pin 13 (built-in LED on Uno)

USB cable for programming

Software Requirements

Arduino IDE (or compatible platform)

WiFiS3 library

Wiring

LED: Connect to pin 13 (onboard LED works, no external connection needed).

Installation

Clone this repository:

Set your WiFi SSID and password in the code:

char ssid[] = "YOUR_SSID"; char pass[] = "YOUR_PASSWORD";

Upload the code to your Arduino board.

Usage

Open the Serial Monitor at 115200 baud to view logs.

Connect your computer or phone to the Arduino WiFi access point.

Open a browser and access the following endpoints:

Endpoint Method Description /tasks GET List all tasks (ID, PID, name) /tasks/status GET Get current task status (running/stopped, last and next run time) /tasks/start/ GET Start task with specified ID /tasks/stop/ GET Stop task with specified ID /tasks/toggle/ GET Toggle task state /tasks/info/ GET Detailed info for a specific task

Code Structure

Task system: struct TCB for task control, with TaskFn function pointers.

Scheduler: scheduler_tick() executes tasks based on their period and state.

REST API: handleClient() parses HTTP requests and returns JSON responses.

Tasks:

task_blink() → toggles LED

task_printer() → prints task info to Serial