Two-Digit Arduino Event Counter with CD4026 — Vertical project video

Chained two CD4026 decade counters together using the carry-out pin to build a two-digit 7-segment counter that increments on a push-button press with basic debounce handling in code. Used it to count laps during a hallway robot race with my kids. Reset button wired to pin 15 clears both digits back to zero instantly.