I implemented an Arduino NFC reader inside my motorbike so I'm able to start and stop it just with the implant in my hand.

Keyboard designed specifically for YouTube and Netflix on a PC. Works great with music players as well.

Multi-purpose display: 4 Digits with 7 segments each. Each segment has 2 NeoPixels.

Model of a bumper car, self-driving (ATMEGA32U4 based)