This clock is built with wsduino (an Arduino compatible board with RTC that I designed), and a dual bi-color LED matrix shield (also designed by me). This basic clock has two buttons, for setting up the hour and the minutes. The RTC is the extremely accurate DS3231, with back up battery to hold the time even when not powered. The wsduino can be re-programmed with your own clock (or other) sketch, using the Arduino IDE. (The current clock sketch that I wrote is open source.)
Details on the wsduino board can be found here: http://timewitharduino.blogspot.ca/2015/07/introducing-wsduino.html
The wsduino board can accept an XBee-footprinted device, like a GPSBee or a WiFiBee, which could make the clock synchronize with either the GPS or an NTP server, respectively. The clock can be customized with other devices like Bluetooth (e.g. display messages sent from your Android device), buzzer (to make it into an alarm clock), relay (to start/stop an appliance) etc,
The LED matrix shield can display three colors: red, green, orange, although the current code uses only the green.
As mentioned, setting up the time cannot be simpler: press one button to increment the hour, the other button to increment the minute.
The enclosure is made of laser-cut 3mm plexiglass and standoffs.
The clock is powered with 5V through the USB miniB connector.
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I like clocks, I like hardware, I like Arduino.