Card Shuffler

The Automatic Card Shuffler is a mechatronics project that combines 3D-printed mechanical design, embedded programming, and electronics to automatically shuffle a standard deck of playing cards. It started as a challenge I set for myself: could I engineer something physical that worked reliably, looked clean, and felt genuinely useful?

The device uses an Arduino Uno to control two motors that alternate pulling cards from each side of the deck, dropping them into a center collection zone through gravity-fed ramps. An IR remote triggers the shuffle, and timed intervals control how long each motor runs. The entire enclosure — including the internal ramps, card holders, and shell — was designed in Fusion 360 and 3D printed by me across several iterations.

The CAD design went through multiple revisions. Getting the card holders to angle correctly so gravity would feed the cards smoothly took real trial and error — small changes in geometry had big effects on reliability. The shell is a multi-piece design that snaps together, and every internal clearance had to account for 3D printing tolerances.

On the electronics side, the Arduino interfaces with a motor driver board and an IR receiver module. The remote maps to commands that trigger motor sequences with precise timing. It was my first time integrating a remote control into a hardware project, and it pushed me to think about debouncing and timing logic more carefully.

The biggest takeaway from this project: hardware is unforgiving. Software bugs are fixable in seconds — a bad tolerance in a 3D print is a four-hour reprint. This project made me a much more deliberate CAD designer and a stronger embedded programmer.