$50 Robot

I couple of weeks ago I built a robot using the $50 Robot tutorial at Society of Robots. I want to thank the authors of the tutorial and the members at the forums for creating such a great resource for noobs like me. Building this robot was great fun, and I feel much more confident now about tackling simliar projects in the future.

The robot’s programming is very simple: it goes right when the right sensor receives more light, it goes left when the left sensor receives more light, and goes straight when the sensor input is equal.

Here’s a close-up of one of the sensors:

The wheels are powered by servos, which run off a set of 4 AA batteries. The board is powered by a 9V battery which is run through a 5V linear regulator to provide a steady 5V to the AT-Mega8 microcontroller. The tutorial suggests buying a battery holder with an on/off switch, which I did, but since I was using two separate power sources I decided to wire in my own on/off switch for the whole circuit.

For the “chassis” I used an old, somewhat flexible plastic cutting board. It was convenient because I could cut it and poke holes into it easily. Since the plastic was so flimsy, I glued chopsticks on the bottom of the robot for support. I highly recommend buying a big pack of wooden chopsticks from the grocery store–it’s like the poor man’s balsa wood.

Here’s a video of the robot in action. As you can see, the wheels don’t always provide the best traction, but hey, it works!

3 thoughts on “$50 Robot”

  1. nice robot, you’re well on your way to being the next iron(wo)man. :D

    I also liked your p4 tips and tricks. We use svn, but it’s nice to know what the other repositorys are like…

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