Phase 3 has begun!
The displays arrived today. First I soldered on the headers. It has probably been 25 years since I did any precise soldering so it doesn't look like a professional job, but it works. I tested each connection with my ohm meter to make sure I had a good contact and wasn't shorted to the next pin over.
Next I followed the tutorial from the Adafruit website to wire up the displays. Then loaded the "Hello World" example. I swapped the displays to make sure both were working correctly. That was quicker than running another set of jumpers.
- update my clock sketch to send the time to the displays
- figure out how to do my custom characters for the large digits
- polish up the sketch and add delay, increment, and multiple periods
- create a setup routine so the time and other settings can be set with button presses
I'll post more updates as I make progress.