My robot is a photophobe (it doesn't like light), and it has two photocells on the front of its nose. This thing is made out of stuff that I just had around the house already (I am a geek. I have a lot of electronics lying around). Although the base looks like crap and uses a plastic bottle as a caster it actually is very sturdy. All the wiring is done with a Arduino microcontroller and a breadboard. I used the breadboard because the arduino doesn't have any sort of power bus and IMO doesn't have very sturdy wire connections. All of the earlier versions of the board look like they have headers (which would be perfect) but the one I have just has these wire inputs like you would find on a breadboard. They just don't hold wires very well. The code took some time to get right, but after about two hours I got it all working. The robot works well, considering the shodiness of the photocells that I used (I did mention that I found everything in my house right?). It was very exciting to see it work for the first time. If one of the sensors has more light then the other it will turn away from the greater light source. This code could be changed so that the robot goes after the greater light source. Actually that was originally the way the code was supposed to be, but I got the commands backwards when I was coding and once I started testing it I decided I liked it. All in all I am really proud of my little bot. I plan on building another more sophisticated bot soon that has a lot more room to expand and has more advanced sensors (and hopefully it will actually serve a purpose ;)
