Jewi from Germany built this Jingle Bells playing Christmas Tree that will actually teach you how to play Jingle Bells. It uses an ATmega to play the song on a speaker and at the same time it lights appropriate LEDs on a keyboard display. You can see on the project page that Jewi used a bunch of SMD parts in the project where some large parts with some large leads might have made construction a bit simpler. The code is available here if you want to make your own.
Via: HG Forum
“We have 9 control lines for the LEDs and 1 line for the speaker signal. We want the device to start playing if a push button is pressed and when done playing the device shall be switch off automatically. For this, we use a pushbutton in parallel to a relay switch which is controller by the ATmega. If someone presses the push button then the ATmega starts running and holds the relay closed.”
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