My Bittle has eyeballs!
I felt like Bittles eyes seemed so hollow that he needed something a little extra. Thanks to my extra 5mm LEDs and resistors from an ATmega kit, I was able to give bittle eyeballs but connecting them to the 5V and GND pins in the front of the board. They are simple lights and just turn on when I power on the dog but I feel like they give him character!
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Connect them to an output and add a little code and you could make them blink occasionally or express emotions by changing color if you used RGB led's.