[Simon] had found a deck in great condition that was locked out, so he set about building his own controller for it. The build relies on the cassette transport of a car stereo and a VFD display ...

The cassette deck in question, a Yamaha K-220 ... This made it easy to interface an ATmega328P to the stereo’s original circuitry. Digital IO pins are hooked up to the buttons, held as high ...