A Proof Of Concept attempt to get accurate(ish) time from an NTP server. The result gives the time within +-10 milliseconds of the time as referenced to the DCF77 time signal from Frankfurt, Germany.

No matter if I use ESPurna, Tasmota or any other firmware to flash my Sonoff POW R2, I could not get NTP to work. After spending hours to at least finding a workaround and visiting all kinds of forums ...

Making a microcontroller perform as a frequency counter is a relatively straightforward task involving the measurement of the time period during which a number of pulses are counted. The maximum ...