101020013 Arduino - Grove Real Time Clock - RTC, DS1307

Description of the The RTC module is a member of the Twig family. It is based on the DS1307 clock chip, which supports the I²C protocol. A lithium cell (CR1225) is used. The clock or calendar supplies seconds, minutes and hours as well as day, date, month and year. The end of the month is automatically adjusted if the month has less than 31 days; leap years are taken into account. The output is either in 24-hour or 12-hour format (then with AM/PM).

reference - Battery is not included.

Technical features - the Real-Time Clock (RTC) counts seconds, minutes and hours as well as day, month and year; leap years are considered up to 2100. - non-volatile memory (NVRAM), 56 bytes, with battery, for data storage - serial I²C interface - Power supply: 5 V (direct current) - programmable square wave signal - automatic power fail detection and switching electronics - consumes less than 500 nA in "Battery Backup" mode, even when the oscillator is running

For the users of Grove (especially beginners) there are instructions in pdf format. Before using the product you should read the chapters "Preface", "Getting Started" and "Introduction to Grove"!