mLink 4x4 Matrix Keypad

Finally, a matrix keypad that doesn't require a million GPIO pins—the built-in I2C interface makes wiring a breeze. The tactile feedback on each key is satisfyingly clicky, perfect for my embedded project.

Plugged it in and the I2C address detection was instant, no fiddling around. The built-in debouncing in the firmware means every keypress registers cleanly without the chatter you'd get building your own. Exactly what I needed for a clean panel mount project.

Wiring this up over I2C saved me a bunch of GPIO pins compared to scanning a raw matrix myself. The tactile keys have a decent click, though the panel mount tabs needed a little filing to sit flush in my enclosure.