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ESP32 time keeping

Q&A Forum › Category: ESP32 › ESP32 time keeping
0 Vote Up Vote Down
Jean Pierre Daviau asked 2 years ago

Hi,
 
If the wifi goes  off (shut down) , how long does the ESP32 keeps  the time obtained ?

JPDaviau

Question Tags: ESP32, time keeping, wifi
3 Answers
1 Vote Up Vote Down
Steve Mercer answered 2 years ago

I’m going to hazard some guesses here but I’m assuming you mean using the built-in RTC of the ESP32 once it is set from a ntp server. The built-in RTC is not very accurate and can lose minutes per day. This is why updating the setting over WiFi is recommended. You can get external RTC’s that are much more accurate. Note that any RTC will gain/lose time so updating via ntp on a regular basis is recommended.

0 Vote Up Vote Down
Jean Pierre Daviau answered 2 years ago

Thanks.

So it is less than  one hour a day?

0 Vote Up Vote Down
Steve Mercer answered 2 years ago

Depends on the board but more than likely yes.

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