Alphanumeric GPS Wall Clock
Nate 
Hardware
It’s been awhile since we built the 12’ GPS wall clock. The GPS Alphanumeric Wall Clock is measurably smaller in size compared to the last one but a lot more sophisticated with its knowledge of local time.
This particular clock uses 6 of the 1” alphanumeric displays with controllers to create a 6 character display. While not as glitzy as EMSL’s awesome Alpha Clock Five, this setup allows us really simple control from an Arduino to scroll time, date, day, and some simple messages. These are controlled with a simple library using an Arduino Uno. A 5V walwart provides all the power for the displays and to power the Arduino. I originally used the Locosys LS20031 GPS receiver. This worked great for three years. Once my original DST code broke I decided to upgrade to the smaller, more sensitive GP635T GPS receiver.
If you'd like to build your own, we reccomend this parts list to get started: