The MinimalPiClock is one of my machines that uses Arduino.
It's an Arduino project for a clock that beeps at pi o'clock PM.
Unplug its power. Plug it in at midnight.
You cannot. It only beeps at pi o'clock PM (thus 15:14).
Yes.
Yes.
Yes.
Yes.
About ten euros in total.
Yes, it is rather easy. All schematics and code are on this GitHub.
No. But I can help. Or try your local hacker- or makerspace.
Yes.