https://www.adafruit.com/product/5188
Adafruit DS3231 Precision RTC - STEMMA QT : Adafruit Industries, Unique & fun DIY electronics and...
The datasheet for the DS3231 explains that this part is an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal". And, hey, it does exactly what it says on the...
stemma qtadafruitds3231precisionrtc
https://www.adafruit.com/product/3028
DS3231 Precision RTC FeatherWing - RTC Add-on For Feather Boards : Adafruit Industries, Unique &...
A Feather board without ambition is a Feather board without FeatherWings! This is the DS3231 Precision RTC FeatherWing: it adds an extremely accurate...
add onds3231precisionrtcfeather