21 x 7.5cm big LED Clock DIY Kit runs on an Arduino Nano, and you can either use the firmware* we provide for download, or program your own application. You could even combine it with our WWVB or DSF77 Atomic Clock receivers, if you feel skilled.

The Arduino demo sketch includes operating instructions within the code header. The Arduino sketch can be downloaded from the external link.

The following functions are included in the demo code:
- 12 or 24 hour time
- date
- time only or date and date intermittent
- seconds on or off
- brief display of date by pressing the snooze button
- automatic display dimming (adjustable behavior by changing parameters in code)
- 3 independent alarms (off, weekdays, weekend, every day)
- alarm snooze (duration adjustable)