Just when you thought you’ve seen every possible kind of Arduino-driven clock, another one emerges. This “DIY strange-looking” device takes the form of a wheel with times written on it, which is rotated using an Arduino Micro and a 5V stepper motor. And while it may not be the most accurate timekeeper out there, it’s an excellent way for Makers to explore electronics, programming, and even geometry.

Unlike most clocks that have either two or three hands going around a 12-hour face, 17-year-old Instructables user “Electronics for Everyone” chose a fixed pointer to denote the time in 10-minute intervals instead.

The idea behind the clock is a circle with a circumfrence of 72cm that ticks at 1cm every 10 minutes, which means every 72 ticks will equal 12 hours…