Posts tagged with “mpr121”

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 - Arduino FIDO2 Authenticator

URU Card - Arduino FIDO2 Authenticator

After a lot of requests to open-source URU Key, I’m starting a new project—URU Card! It’s a wallet-sized, open-source FIDO2 authenticator with an OLED screen, touch keyboard, and ESP32 brain. No biometrics (for now), but secure, DIY-friendly, and easy to build with Arduino libraries. Want to join in?

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