The Grove - DS1307 RTC is based on the DS1307 clock chip and supports I2C communication! The RTC uses a Lithium cell battery (CR1225). We choose to use the RTC based on DS1307 as it is low cost and also very energy efficient. It can run for years on a very small coin cell!
The clock/calendar provides seconds, minutes, hours, day, date, month and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator.
What is an RTC (Real Time Clock)
An RTC (real-time clock) refers to a clock that tracks the current time and can be used to program actions at a specific time.
The Arduino and almost all microcontrollers have built-in timers, they can run as long as there is power. However, once the power is turned off (either manually or due to a power failure), all timers will be reset to 0.
It is acceptable to use the internal timer for the timing of simple projects if you don't mind when the timer resets to zero once there is no power. But for projects such as data loggers, clocks and alarms which require the timer to run independently of the external power supply, you need to use an RTC.
Almost all RTC are low-current built-in ICs and able to run on a single lithium battery for many years. Currently, RTCs based on the DS1307 real-time clock are one of the most popular RTC modules.
Note: Battery not included
Features
Real-Time Clock (RTC) counts seconds, minutes, hours, date of the month, month, day of the week, and year with Leap-Year compensation valid up to 2100
56-Byte, Battery-Backed, Nonvolatile (NV)RAM for data storage
I2C serial interface
5V DC supply
Programmable Square-Wave output signal
Automatic Power-Fail detect and switch circuitry
Consumes less than 500nA in Battery-Backup Mode with Oscillator Running
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