Components needed to make the shield-8* NPN transistors (I used some BC 547 and some 2N2222a because I didn't have 8 of either one) 8* 1k ohm resistors (a value close to that should work) Stack Headers (optional) Pin Headers 9V Battery and clip Perf Board
Hey, if you want a fun project for determining if your transistor is NPN or PNP please refer to my 'The Transistor Testenator' instructable.
ToolsSoldering iron Wire cutter and pliers
You, of course, need to have an Arduino and motors. A breadboard would also help as it allows you to prototype the circuit before soldering it permanently on to the perf board.