Kit Review – adafruit industries DS1307 Real Time Clock breakout board kit

Hello readers

Today we are going to examine another small yet useful kit from adafruit industries – their DS1307 Real Time Clock breakout board kit. My purpose of acquiring this kit was to make life easier when prototyping my clock and timer Arduino-based projects on a breadboard. For example, blinky, or the various clock projects in the Arduino tutorials.

When breadboarding a DS1307 circuit, there are a few problems – the legs of the crystal are very fine, and break easily, and trying to mount the backup battery holder on the breadboard can be difficult due to their odd pin-spacing. That is why this breakout board is just perfect for breadboarding. Finally, (in Australia anyway) the price of the kit is less than the sum of the retail cost of the parts required. Anyhow, time to get cracking!

Again, as usual the adafruit kit packaging is simple, safe and reusable:


And with regards to the contents within:


… no surprises here, another quality solder-masked, silk-screened PCB  that has everything you need to know printed on it. Now that you can see the crystal (above image, bottom-right) you can realise why this board is a good idea. Furthermore, the inclusion of a quality battery and not some yum-cha special is a nice touch.

Assembly is incredibly simple. The IC position is printed on the PCB, the resistors are the same, and the capacitor and crystal are not polarised. Again, no IC socket, but perhaps it is time not to worry about that anymore – my soldering skills have improved somewhat in the last twelve months. Plus the DS1307 can handle 260 degrees Celsius for ten seconds when soldering (according to the data sheet.pdf).

However if you like to read instructions (which is generally a good idea) the excellent documentation is laid out here for your perusal.

Soldering the board is quite straightforward, however when it comes time to solder in the coin cell holder, note that there are large gaps in the mounting holes:


It is important to solder the pins solidly to the PCB, without letting lots of solder flow through the hole and block the other side. If you can bend the pins slightly closer to the circumference of the hole, soldering will be a lot easier. And don’t forget to put a blob of solder on the top-facing pad between the two pin holes before soldering in the coin cell holder.

Finally, when time to solder in the header pins, mount the lot onto a breadboard, and support the gap between the PCB and the breadboard at the opposite end of the PCB. An old CD works very well:


And within ten minutes of starting, we have finished!


Insert the backup cell (writing facing up!) in the holder and you’re ready to time. A new backup cell should last between seven to ten years, so unless you want to reset the clock completely, leave the cell in the board.

Now it is time to use the board. My only experience is with the Arduino-based systems, and even so using the DS1307 can seem quite difficult at the start. However with the right library and some basic reusable sketch modules you can do it quite successfully. The board is a standard DS1307 circuit, and is explained in great detail within the data sheet.pdf.

Don’t forget you can get a nice 1 Hz (or 4, 8 or 32 kHz) square wave from this IC – here is a sketch that allows you to control the square-wave generator:

And a video demonstration:

Well I hope you found this review interesting, and helped motivate you to expand your knowledge and work with real-time clocks, Arduino and the I2C bus.

You can purchase the kit directly from adafruit industries.

As always, thank you for reading and I look forward to your comments and so on. Furthermore, don’t be shy in pointing out errors or places that could use improvement. Please subscribe using one of the methods at the top-right of this web page to receive updates on new posts. Or join our new Google Group. High resolution images are available on flickr.

[Note – The kit was purchased by myself personally and reviewed without notifying the manufacturer or retailer]

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John Boxall

Person. Founder and original author for VK3FJBX

6 thoughts on “Kit Review – adafruit industries DS1307 Real Time Clock breakout board kit

  1. Don

    Thanks for doing the reviews of Adafruit products. I think she does a great service with her tutorials, instructions and construction of the kits themselves.

    I have used other products from her and recommend them.


    1. John Boxall

      Hi Don
      Crikey you’re quick off the mark 🙂 Yes, their products really are that good – that is why I review and use them. Plus I find their open business philosophy is quite inspiring.
      Thanks for dropping by!

  2. jbarntt

    Hi John,

    My experience with RTC’s is in the PC world. I’m guessing that this Adafruit kit could be used as the basis for a simple on/off device to control an electric light, simple coffee, etc. Usual caveats re: interfacing with wall current of course.

    I’ve got an Adafruit Arduino kit, plus a couple of books, and just today, their basic electronics hardware kit, (multimeter, soldering iron, third hand etc).

    Thanks for the review.

    1. John Boxall

      Thanks for your comments. Yes, the DS1307 kit will provide a nice timing solution for Arduino projects (and others). Using your arduino board and this kit, you can create an almost infinite number of timing solutions. Adafruit actually sell the perfect device for controlling 110V AC with an Arduino – this >
      There are some examples of programmable Arduino-based timers that could control the powerswitch tail in tutorial chapter ten >
      Have fun

      1. jbarntt

        Hi John,

        Thanks for the reply.

        Based on your notes, I’m thinking that adding a DS1307 kit to my Arduino, and connecting my Arduino to the connectors on the Adafruit powerswitch tail would allow me to make a sketch to turn on and off the power to an attached device, such as a lamp, on a simple schedule.

        I won’t bug you anymore about this 😉 You’ve definitely pointed me in the right direction.

        Many thanks,


      2. John Boxall

        Absolutely, spot on. Soon you will be creating all sorts of timing applications!
        Thanks for your enjoyment and kind words. You can keep bugging me if you like.


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