86 lines
5 KiB
Markdown
86 lines
5 KiB
Markdown
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# Task Scheduler
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### Cooperative multitasking for Arduino microcontrollers
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#### Version 2.6.1: 2018-03-15
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### OVERVIEW:
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A lightweight implementation of cooperative multitasking (task scheduling) supporting:
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1. Periodic task execution, with dynamic execution period in `milliseconds` (default) or `microseconds` (if explicitly enabled) – frequency of execution
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2. Number of iterations (limited or infinite number of iterations)
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3. Execution of tasks in predefined sequence
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4. Dynamic change of task execution parameters (frequency, number of iterations, callback methods)
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5. Power saving via entering **IDLE** sleep mode when tasks are not scheduled to run
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6. Support for event-driven task invocation via Status Request object
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7. Support for task IDs and Control Points for error handling and watchdog timer
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8. Support for Local Task Storage pointer (allowing use of same callback code for multiple tasks)
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9. Support for layered task prioritization
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10. Support for `std::functions` (`ESP8266` only)
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11. Overall task timeout
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Scheduling overhead: between `15` and `18` microseconds per scheduling pass (Arduino UNO rev 3 @ `16MHz` clock, single scheduler w/o prioritization)
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**TaskScheduler** was tested on the following platforms:
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* Arduino Uno R3
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* Arduino Nano
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* Arduino Micro
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* ATtiny85
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* ESP8266 (Node MCU v2.0)
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* ESP32
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* Teensy (tested on Teensy 3.5)
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---
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### [Changelog:](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog)
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Version|Version 1|Version 2
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---|---|---
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|| |[2.6.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v261) (*current version*)
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||[1.9.2](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v192)|[2.6.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v260)
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||[1.9.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v190)|[2.5.2](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v252)
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||[1.8.5](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v185)|[2.5.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v251)
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||[1.8.4](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v184)|[2.5.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v250)
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||[1.8.3](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v183)|[2.4.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v240)
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||[1.8.2](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v182)|[2.3.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v230)
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||[1.8.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v181)|[2.2.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v221)
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||[1.8.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v180)|[2.2.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v220)
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||[1.7.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v170)|[2.1.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v210)
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||[1.6.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v160)|[2.0.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v201)
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||[1.5.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v151)|[2.0.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v200)
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||[1.5.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v150)|
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||[1.4.1](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v141)|
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||[1.0.0](https://github.com/arkhipenko/TaskScheduler/wiki/Changelog#v100)|
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#### For detailed functionality overview please refer to TaskScheduler documentation in the 'extras' folder or in the [Wiki page](https://github.com/arkhipenko/TaskScheduler/wiki).
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### Check out what TaskScheduler can do:
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* [3 Devo](http://3devo.eu/) - Quality 3D printing filament, now made accessible and affordable
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(http://3devo.eu/license-information/)
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* [Houston midi](https://github.com/chaffneue/houston) clock project - TaskScheduler with microseconds resolution
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>by chaffneue:
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>>My first arduino project. It's a multi-master midi controller with a shared clock and
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auto count in behaviour.
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youtube: https://www.youtube.com/watch?v=QRof550TtXo
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* [Hackabot Nano](http://hackarobot.com/) by Funnyvale - Compact Plug and Play Arduino compatible robotic kit
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https://www.kickstarter.com/projects/hackarobot/hackabot-nano-compact-plug-and-play-arduino-robot
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* Arduino Nano based Hexbug Scarab Robotic Spider
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(by arkhipenko: http://www.instructables.com/id/Arduino-Nano-based-Hexbug-Scarab-Robotic-Spider/)
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* Wave your hand to control OWI Robotic Arm... no strings attached
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(by arkhipenko: http://www.instructables.com/id/Wave-your-hand-to-control-OWI-Robotic-Arm-no-strin/)
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* APIS - Automated Plant Irrigation System
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(by arkhipenko: http://www.instructables.com/id/APIS-Automated-Plant-Irrigation-System/)
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* IoT APIS v2 - Autonomous IoT-enabled Automated Plant Irrigation System
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(by arkhipenko: http://www.instructables.com/id/IoT-APIS-V2-Autonomous-IoT-enabled-Automated-Plant/)
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* Interactive Halloween Pumpkin
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(by arkhipenko: http://www.instructables.com/id/Interactive-Halloween-Pumpkin/)
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