Hi and happy new year!

This is a mechanical-style counter used to track time.

The system incorporates a timer counter that displays elapsed time in HH:MM:SS format, with hours, minutes, and seconds each represented by tens and units digits.

The display is composed of rotating digit drums whose angular positions are continuously updated based on the elapsed time. Each drum advances in discrete steps to represent its assigned time digit.

Counters have evolved from early mechanical counting devices to modern digital systems, with rotating drum mechanisms playing a key role in the historical development of time measurement and display.

No extra variables.

Due to its time-driven design, the counter can be extended to support multiple aerodynamic use cases involving duration measurement, cycle counting, and state tracking.

Enjoy!