Description: Code to synchronize the DS3231 RTC breakout board using the Adafruit HUZZAH ESP8266 as an NTP network client. This allows for manual, instantaneous NTP synchronization of the DS3231 ...

This is a remarkably inexpensive and easily interfaced battery-backed RTC. It is an ideal way rapidly to calibrate the Pyboard's RTC which can then achieve similar levels of accuracy (+- ~2 mins/year) ...