Christmas Polyphonic Music Box

Interesting Christmas project…

Using PICmicro and Proton compiler (BASIC language), Les Johnson build a Christmas polyphonic music box. The project use 3 channels to generate polyphonic effects. Each channel use 2 port of  PIC18F452. One for generating base frequency, the other to create volume envelope, to generate pleasant chime effect.

The music data is stored in a series of LDATA. To play a music you should load the notes to this area. Don’t worry, Les also explain how to convert your favorite Christmas Midi songs to appropriate format.

Circuit diagram, source code and descriptive information you can get from the website.