vibrating box needs led! (help me)
so after gaining inspiration from the bristle bot i made my own thing which is just a 9volt battery a switch and a motor, So far it has been really quite amusing. But I think it could use a little bit of improvement. First off would I need a resistor? And if i wanted to add an LED how would i find out what resistor to use. I got a pack of 20 random mixed ones off electric goldmine so i would want to attach one of those. Help!?