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.
Paul wrote:
A minimum component dumb robot build upon a paint roller. “Roller bot”. Fantastic simple project to stimulate variants and other endeavors of students or adults interested in tinkering or with robots. My personal interest is “minimal engineering” and this project strived to use as few parts as possible making something that worked.
Check out this site here. You can check out the instructions here.
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