B4R Question ESP8266: TimeNIST + RTC timer + DeepSleep ~ clock

tigrot

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• Oct 19, 2020

• #2

I never tested internal rtc. Normally the rtc must be Initialized, then started. The last operation starts rtc count. I think this is true for your case as well.

 

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peacemaker

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• Oct 19, 2020

• #3

But why RTC time after DeepSleep is not proportionally bigger than before ? No more than ~16000.
I guessed, it should tick all the time while powered up. And if 1 min in DeepSleep - after resume the value should be > 60 seconds

 

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tigrot

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• Oct 19, 2020

• #4

Found. Esp8266 doesn' t have an internal rtc.

 

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tigrot

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• Oct 19, 2020

• #5

https://www.b4x.com/android/forum/threads/8266-rtc-memory-other-information.107753/
May help you.

 

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peacemaker

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• Oct 19, 2020

• #6

I used exactly this code to try. Many articles on the internet describe that RTC exists, but coplex.... But cannot be found normal example.
OK, i will use just a incremental counter in this RTC memory...

But here is interesting site: https://nodemcu.readthedocs.io/en/release/modules/rtctime/#rtctimedsleep

 

Last edited: Oct 19, 2020

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tigrot

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• Oct 19, 2020

• #7

Tried to use in online C?

 

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peacemaker

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• Oct 20, 2020

• #8

Hmmm, yes, as in those example, how another, most of native functions in B4R we use via inline C.

 

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derez

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• Oct 20, 2020

• #9

You can get time from NIST with the limit that it must be not less than once in 4 seconds. I have a clock running with getting time from Nist every few minutes and a timer of 1 second to advance the time, not RTC. After wake up get time from NIST and continue.

 

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peacemaker

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• Oct 20, 2020

• #10

derez said:

not less than once in 4 seconds

Click to expand...

Thanks for info. But for batch of devices under shared WiFi IP address it will be rather often anyway, devices are asyncronouse..

 

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