Thanks for the tutorial.
Wondering if you have any suggestions. I am using an AutomationDirect Din Mounted Arduino. Model is P1AM-100. The board uses the SAMD21G18 Microcontroller like the Arduino MKRZERO and other similar boards. The GPIO Shield brings pins 13 and 14 out as RX/TX. Like the person with the uno, I can receive the pushbuttons from the display in your demo program, but the display never shows the text strings or updates time strings. Only hh: mm: ss shows. From the info I supplied, do you think there could be a solution? Anything you think I could try? Thanks!