Adafruit DS3231 Precision RTC Breakout. The datasheet for the DS3231 explains that this part is an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal".
And, hey, it does exactly what it says on the tin! This Real Time Clock (RTC) is the most precise you can get in a small, low power package. Most RTCs use an external 32kHz timing crystal that is used to keep time with low current draw. And that's all well and good, but those crystals have slight drift, particularly when the temperature changes (the temperature changes the oscillation frequency very very very slightly but it does add up!) This RTC is in a beefy package because the crystal is inside the chip! This is the finest RTC you can get, and now we have it in a compact, breadboard-friendly breakout. Comes as a fully assembled and tested breakout plus a small piece of header. A coin cell is required to use the battery-backup capabilities! Check out our detailed tutorial for pinouts, assembly, wiring & testing, and more! Technical Details Learn.
DS3231 I2C Real Time Clock Module with AT24C32 Memory Real time clock module [M033] - £1.81 : Bitsbox, Electronic Components. A low cost, accurate I2C real-time clock. with an integrated 32K AT24C32 EEPROM.
![DS3231 I2C Real Time Clock Module with AT24C32 Memory Real time clock module [M033] - £1.81 : Bitsbox, Electronic Components](http://cdn.pearltrees.com/s/pic/th/at24c32-electronic-components-163442935)
Supply voltage 3.3 V to 5.5 V A coin cell battery holder allows fitting of a LR2032 rechargeable cell to provide a non-volatile backup facility. 2 programmable time-of-day alarms, a temperature sensor, and 32.768 kHz signal output pin. The AT24C32 EEPROM can be used to add non-volatile data storage to your project. Features I2C communication - the default addresses - 0x57 (eeprom) & 0x68 (rtc). Can be cascaded with other I2C devices Two calendars and alarm clock Two programmable square-wave outputs Real time clock generator for seconds, minutes, hours, day, date, month, and year timing Valid until 2100 with leap year compensation Memory chip: AT24C32 (32 Kb storage capacity) On-chip temperature sensor with an accuracy of ±3 ℃ I2C bus interface maximum speed: 400 kHz Size: 38 x 22 x 14 mm Arduino alarm clock project available here. AdaFruit UK - Proto-PIC. GearBest - Best Gadgets & Electronics Deals.
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