Next time I need to paint my house, I need these… well i’d need a house first though…lol
Here is a good site on making robots out of very ordinary parts. This simple robot can be changed in a number of ways to do basically whatever you want it to do. This little robot is very simple. It simply uses an IR photo transistor connected to a 2N2222 transistor. This transistor is used to drive the motor. This schematic seems to put a lot of current through the photo transistor. I think, I would add a 100 ohm resistor in series with it.