Let's Make Robots!

help make herbie, feivel, junkbot, etc.

Hi guys,

I'm tryng to make a herbie circuit but can't get it to work. I attached a link of my EXACT circuit on a breadboard. Can someone tell me what I am wiring wrong?

herbie circuit:


my circuit:


help with wheel/motor

Hello everyone! I have a motor but I don't know what type of wheel I need for it.

This is the type of motor I am using:


 I want to put a big wheel on it (not too big) so if anyone can help me find one that fits....it would be great!