The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.

It takes a handful of LED arrays with an integrated driver, an Arduino Nano, a real-time clock module, and a voltage regulator. The software uses a custom 6×9 font and handles addressing the LEDs ...

Dejan Nedelkovski has built a stylish DIY touchscreen Arduino music player and ... it uses the BY8001 MP3 Player module and for the alarm clock it uses the DS3231 Real Time Clock module.

For example, you could add a real-time clock module to keep accurate time even when the Arduino is powered off, or you could use different colors of LEDs to create a more visually striking display.