The IR sensor array, which on the palm-sized vehicle consisted of just a handful of components, evolved into a PCB-backed bar nearly 0.5 meters wide. Potentiometer tuning was a fiddly affair, but ...

The stack of 45 records were replaced with an Arduino Mega 2560 with an Sparkfun MP3 player shield, and he jukebox lights are now controlled with 74595 shift registers.