A couple of small improvements.

1. Made the switch to the Attiny85, digispark flavor. This toy is fantastic and has the bare minimum needed to emulate the keyboard and...
2. Added a neopixel ring. When someone is present a green LED will circle; if no presence detected, the ring will show a Knightrider KITT type of anymation. See video here.

Since the Attiny85 doesn't seem to provide pull-down resistor, a 200ohm is required. In the code the number of LEDs is hard coded. The KITT animation won't work with less than 4 LEDs and will likely crash the app. Caveat emptor