DS3231 library for the Arduino. This library implements the following features: - read/write of current time, both of the alarms, control/status registers, aging register - read of the temperature register, and of any address from the chip. Author: Petre Rodan <petre.rodan@simplex.ro> Available from: https://github.com/rodan/ds3231 License: GNU GPLv3 The DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal.