ESP8266 Community Forum

Hi,
i have flashed my Witty board ESP16F with a program that enter deep sleep for a predefined time(1 hour) and a catch the signal of reset (GPIO16) on wake up using an oscilloscope
and the result is that my Witty board wake up before the predefined time( 1 hour) with 8s or 10s sometime 15seconds
the question is if the RTC timer is inaccuracy, what would be the solution to have a deepsleep of 1 hour exactly ?
sorry for my bad english

Duplicate post

An external RTC to wake the ESP8266. Either that or try to compensate for the deviation with an initial calibration routine. Scale the timer value to match the real time you want.