Product was successfully added to your shopping cart.

Go to cart page

You have successfully subscribed to this product. You will receive an email when the product is in stock.

Rtc shield for arduino

Velleman KA07: RTC Shield Kit for Arduino® Uno

Velleman KA07

In stock

+ -

Free ground shipping on orders over $75.
More info...

The Velleman KA07 RTC (Real Time Clock) Shield Kit for Arduino Uno

Extend the data-logging capabilities of your Arduino UNO® with the Velleman KA07 RTC Shield Kit!  The KA07 shield keeps accurate, real-time date and time reads, allowing the microcontroller to focus energy elsewhere. Customize your time preferences by choosing a 12 or 24-hour schedule and programming between AM and PM.

Downloading the software library (under downloads tab) allows you to manage the LED frequency on the shield. The shield has low power consumption and a backup battery to give power when the shield is not active. The KA07 electronic kit is somewhat advanced and does require soldering.

This is an accessory shield that requires Arduino UNO® (not included).



  • I2C Interface
  • Accuracy: 20ppm (depends on crystal)
  • Power Consumption: 1.5mA
    • Backup battery holder (500nA when running on battery)
  • Dimensions: 2.67" x 2.08"



  • Based on Maxim-Dallas DS1307 IC
  • Counts seconds, minutes, hours, date of month, day of the week, year and leap-year
  • Large user community


Stackable Design

The KA07 real time clock shield can be stacked with other Arduino shields. View more Velleman models:

  1. thumbs up review by gadget go go on 6/9/2015

    nice shield fun to build works great easy

Write Your Own Review

How do you rate this product? *





Assembly instructions
Written multilingual manual explaining how to build the kit

Parts list
English assembly instructions through illustrations, pictures, etc.


KA07 library
Modified to manage the frequency of the flashing LED on the shield, driven from the SQW.

Info Sheets

Resistor colour code

Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

Product information

Frequently Asked Questions

Q. Which #include should i install for the KA07?

Use: #include "RTClib.h"

Download the KA07 library on the Downloads tab

Examples are included in the library download.

Have a question?

* required fields

 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product