Timing
A library to drive the RV-1805 extremely precise, extremely low power, real-time clock
The RV-1805-C3 from SparkFun is a very unique and exciting Real Time Clock. It is extremely precise (less than 7ppm per year!), extremely low power (less than 22nA!) and has all the necessary oscillators built-in making it small! The RV-1805 has not one, but two internal oscillators: a 32.768kHz tuning fork crystal and a lower power RC based oscillator. The RV-1805 can be configured to automatically switch between oscillators using the more precise crystal to correct the RC oscillator every few minutes. This allows the RTC to maintain a very accurate date and time with the worst case being +/- about 3 minutes over a year. The RV-1805 library operates the RTC at 22nA allowing for very long run times with very small backup power sources.
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.