Jingle bells playing light-up piano keyboard

[jewi]

Hi folks,

I felt like Christmas so I had to do this :



It's a small decoration tree with a push button and a small keyboard. If you press the button it starts playing jingle bells and lights up the appropriate key on the piano keyboard. On the backside of the tree there is the battery, a speaker, an ATmega8 to control everything and some simple electronics to put stuff together. I described everything step by step here:
http://www.snej.de/2012/11/jingle-bells-playing-light-up-piano.html

Feel free to share, modify, reuse whatever is useful to you.

Regards
Jens