Comments on: ESP32/ESP8266: Run Daily Task at Specific Time (Arduino IDE)

By: Peter

Peter — Wed, 30 Jul 2025 07:30:12 +0000

Hi, I have the same issue where shutting down the router after the first sync still gives a successful synchronisation result even though the wifi is no longer operating. It should NOT show that the synchronisation was successful if the wifi has stopped working.

any thoughts apreciated.
Peter

By: iw2fvo

iw2fvo — Mon, 07 Jul 2025 17:41:17 +0000

good dat Sara and congratulation for this useful project.
I did set the synch rate to one minute for test purpose doing like this:
const unsigned long ntpSyncInterval = 1 * 60 * 1000; It is OK.
We found that if the WIFI goes off and/or he modem router goes off we still have the following messages:
“Synchronizing time with NTP server…”
” Time synchronized!”
HOW is it possible if the NTP data are NOT AVAILLABLE?
Could you please clarify the point ?
Thanks
iw2fvo, ambro

By: Sara Santos

Sara Santos — Mon, 05 May 2025 10:03:55 +0000

In reply to KiwiME.

That’s great.
Thanks for your comment.
Regards,
Sara

By: KiwiME

KiwiME — Fri, 02 May 2025 22:08:29 +0000

Thanks for this. Worked first time and saved me a lot of work for a home project where I need to charge a generator battery once a day.

By: John Paul Froehlich

John Paul Froehlich — Wed, 26 Mar 2025 20:23:01 +0000

Is daylight savings time included in the time available from network.

By: Veit

Veit — Thu, 20 Mar 2025 19:03:21 +0000

Hello
My internet router can also be addressed as an NTP server on my FritzBox. The query on its IP address works flawlessly. The router also retrieves the data from an NTP server and makes it available on the home network.

By: larry.platzek

larry.platzek — Wed, 19 Mar 2025 20:39:53 +0000

good IDEA

By: hackepeter_101

hackepeter_101 — Wed, 19 Mar 2025 13:30:24 +0000

In reply to Jim Allison. Exactly what I thought. I didn't even know an ESP32 had such a pin though

By: Jim Allison

Jim Allison — Tue, 18 Mar 2025 21:50:34 +0000

I wonder if you could create a similar tutorial that implements the ESP32 deep sleep capability with a 32.768kHz crystal on GPIO XTAL32 pins to keep the RTC from drifting. Then the ESP32 could wake up at precisely the right time and send a message. Of course, it would need to occasionally synchronize with the NTP server because even a crystal will drift (but not by very much).