Posts tagged with “pcb design”

Using MPR121 touch keyboard controller with Arduino

Using MPR121 touch keyboard controller with Arduino

I added a tiny capacitive touch keyboard to the URU Card using the MPR121 chip—and it works great! The PCB has 12 touch pads, the setup is dead simple with I2C and the Adafruit library, and best of all… no debouncing needed. Smooth and responsive UI, just like I hoped.

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URU Card - the new PCB design

URU Card - the new PCB design

Got a fresh batch of URU Card PCBs, and this time I used them to build a full hard shell case—just by stacking boards together. No 3D printing needed! I also switched to a PCB antenna (zero cost!) and prepped the layout for a future USB interface with the FT260 chip. It’s compact, wallet-friendly, and fully functional.

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