- Using a parallel cable with ends stripped back 1/4", tin the ends with a small amount of solder.
- Isolate the computer input using a 74SL245 buffer chip, connecting D0 to A1, D1 to A2, D2 to A3, D3 to A4, and 25 to ground.
- Connect B1 through B4 to pins 16, 12, 18 and 20 on the floppy cable.
- Connect one of the grounds from the floppy cable to ground on your breadboard.
- Test by sending the proper low/high from the computer. Example Low to pin 16 turns motor on.
- Floppy will be relegated to a desk if you don't build a cable to connect to the computer.
- If the 9V battery is able to power the wheels, then you simply need a cable (cat5 UTP would probably do) to go between the floppy cable and your breadboard.
- To get the motor turning and the stepper motor moving back and forth you need only 5 wires (4 input and 1 ground). The other three could be used to get input from photsensors or whatever else you can figure out.
Desk bound: Floppy elevated so "his" wheels can spin. Connected to a breadboard via a short floppy cable.