So, you need to purchase the battery from your local store. Here is my attempt at a library for the DS1307 real-time clock, which connect via I2C. Post offices do not allow shipping of batteries. Library for DS1307 Real Time Clock Forum 2005-2010 (read only) Software Development system October 1, 2007, 3:24am 1 Hi all, I'm new to Arduino, AVR, microcontrollers, and not proficient with C. The module works with CR2025 or CR2032 cell. Grove RTC (6.90) This is Seeed very own RTC based on the clock chip DS1307 and supports I2C communication It uses a Lithium cell battery (CR1225). Package includes: 1x DS1307 Module (BATTERY NOT INCLUDED) 56 Bytes of Non-volatile memory available to user The DS1307 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of non-volatile SRAM. The real-time clock of this module counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100.The DS1307 is accessed via the I2C protocol. You have to reset the module and set your own time. The module comes fully assembled and pre-programmed with a time. The library auto-detects the chip connected. The library comes in two flavors: Arduino library and avr-gcc library. The DS1307 is the most popular RTC, and works best with 5V-based chips such as the Arduino. This tutorial shows how to explore an inexpensive DS1307 Real Time Clock module with Arduino using the DS1307RTC and Time libraries. TWI/I2C Real-time clock library A library for the DS1307 and DS3231 real time clocks for ATMega chips. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. Address and data are transferred serially via a 2-wire, bi-directional bus. This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. The DS1307 Serial Real-Time Clock is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM.
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