A library to drive the RV-1805 extremely precise, extremely low power, real-time clock
The RV-8803 from SparkFun is an extraordinarily precise, temperature-compensated RTC. The module itself can run as low as 240 nA. This library allows you to set and get time, set the hundredths registers, configure interrupts, and even calibrate your RTC.
Maintainer: SparkFun Electronics
This library is compatible with all architectures so you should be able to use it on all the Arduino boards.
To use this library, open the Library Manager in the Arduino IDE and install it from there.