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arkhipenko / TaskScheduler

Cooperative multitasking for Arduino, ESPx, STM32, nRF and other microcontrollers
http://playground.arduino.cc/Code/TaskScheduler
BSD 3-Clause "New" or "Revised" License
1.22k stars 224 forks source link

Run task daily at a specified time #95

Closed alve89 closed 4 years ago

alve89 commented 4 years ago

Is it possible with your library to perform a task lets say every day at 8 PM / 20:00?

arkhipenko commented 4 years ago

At the core, TaskScheduler is not bound to a specific absolute time. Most microcontrollers are not capable of knowing the absolute time anyway. What you can do it either use Real Time Clock (either hardware or millis()-based, but the latter you need to set every time the mc boots up), or, for WiFi MC's like esp8266, you can run an NTP query, set the time, and then launch at a specific time (which you need to do periodically checking "is it time yet - no, is it time yet, no, is time yet - YES!" :)

For RTC you could check out this repo. And for NTP this one.

Both are a bit large and complex, but I am sure you can isolate the needed components and reuse.

arkhipenko commented 4 years ago

Interesting idea for a future feature option though. Or at a minimum an example.

arkhipenko commented 4 years ago

you can also set alarm on an RTC, and trigger a task via pin interrupt.

alve89 commented 4 years ago

Thanks for your quick reply!

I'm using an ESP32 and wanted to run a task daily. Since I read the ESP32's RTC is not the best I'm trying to use my DS1307 RTC module. So by now I'm used to NTP and RTC. BUT: By receiving the current timestamp via NTP I'm also getting the date (!) and time. And the date is my problem, because I don't know how to set a specified datetime as absolute begin (like 00:00:00). From there I could calculate 24h x 3600s/h. And here I thought I could your library...

arkhipenko commented 4 years ago

I believe the library I used had an option of using Unix time, which is number of seconds from some date in 1960... Easy to work with when you don't need more than a second precision.

alve89 commented 4 years ago

But not directly with your library and it’s functions of „multitasking“, right?

arkhipenko commented 4 years ago

No. TS currently does not support scheduling based on specific time/date.

alve89 commented 4 years ago

Very pity, but thanks for your quick help.