We've upgraded this RTC breakout and made it even easier to use! Now available as a fully assembled board, it has the same components, chip, size, etc but you don't have to put it together. It's also less expensive! Check out the Assembled DS1307 Breakout here!

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. Please 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 alternative, please check out the ChronoDot.