Looking for advices for ESP32S3 clock without Internet

[lladam]

Hi all.
Are there any suggestions for ESP32S3 clock without use of internet?
Thanks
Adam

[ESP_Sprite]

Suggestions for what exactly? A kit to build? How to write firmware? An existing product? Something specific you would normally do via the Internet but now are looking for a different way? Hardware design? Software design?

[bidrohini]

You have to use the in-built RTC of the ESP32. https://www.theelectronics.co.in/2022/0 ... esp32.html

[lladam]

You have to use the in-built RTC of the ESP32. https://www.theelectronics.co.in/2022/0 ... esp32.html

Thanks.
how to set current time in this link?

[Franco]

"The first line of the setup function sets the time to January 17th, 2021 at 15:24:30,"
Just change the date and time to the desired ones.

[lladam]

"The first line of the setup function sets the time to January 17th, 2021 at 15:24:30,"
Just change the date and time to the desired ones.

Thanks.
I tested the link you shared that works well, question is when the battery is used up, only way to correct the time is re-upload sketch, is it possibly to use NTP to synchronize and sign the current time to ESP32 like: rtc.setTime(current time); ?