document updated 18 years ago, on Apr 5, 2006
Similar to this, though with no interface chips. Either use all 16 pins of a 16F628, or use a 16F870 for more pins, or a 16f876 for more memory, or get crazy with the LED wiring and only use 9 pins of a 16F628 and have plenty of room left.
Also, I could double up the boards so that the PIC and battery and such are behind the LED board, so that the face of the unit wholly covered in LED's.