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.
How to set the time
Unplug its power. Plug it in at midnight.
How to read the time
You cannot. It only beeps at pi o'clock PM (thus 15:14).
Can the MinimalPiClock be powered by USB?
Can the MinimalPiClock be powered by a 5V DC adapter?
Can the MinimalPiClock be powered by 3x AAA batteries?
Can the MinimalPiClock be powered by 4x AAA batteries?
How expensive is the MinimalPiClock?
About ten euros in total.
Can I make a MinimalPiClock myself?
Yes, it is rather easy. All schematics and code are on this GitHub.
Will you make a MinimalPiClock for me?
No. But I can help. Or try your local hacker- or makerspace.
Do you think using an ATMEGA328 chip is overkill here?