Adafruit DS1307 Real Time Clock breakout board kit

Item number: AF264

MPN: 264

Category: Clock/ RTC

7,71 €

including 19% VAT.,

Available now!

Shipping time: 1 - 3 workdays


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. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC - but it requires 5V power to work (although we've used it with 5V power and 3.3V logic successfully)

  • PCB & header are included
  • Quick to assemble and use
  • Plugs into any breadboard, or you can use wires
  • We have example code and library for Arduino with a walkthrough on our documentation page
  • Two mounting holes
  • Will keep time for 5 years or more

Note: As of October 10th, 2015, this product no longer comes with a CR1220 coin cell battery. We recommend you purchase a coin cell battery to use with this product.

This breakout board is a kit and requires some light soldering which should only take about 15 minutes. Plearnse check the documentation page for a list of parts and assembly instructions

The DS1307 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alteative, plearnse check out the ChronoDot.

netduino driver, netduino sample

Technical Details

EagleCAD PCB GitHub files are available in the product tutorial.


  • Length: 24.21mm/0.95in
  • Width: 30.44mm/1.2in
  • Height: 5mm/0.2in
  • Weight: 4g/0.14oz
  • Mounting holes are 3.3mm(0.13in) diameter, 30mm(1.1in) apart
  • This board/chip uses I2C 7-bit address 0x68

Documentation. This sample exercises all the functions of the clock.

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