After a lot of work, I finally have a prototype of short stuff done. I still need to add the suspension on the front and rear casters, and I think I might redo the head, but it finally is coming along.
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Well, after hours of working in the basement on the robot, I am redesigning the robot to be made of 1/8" Acrylic and plan to have it laser cut by Lynxmotion. I just can't make lots of parts with close tolerances.
I have everything designed except actually laying out the PC boards. That's what I plan to do this week once I get the rest of the robot parts made.
I posted the preliminary information and a picture of the CAD drawings of my new robot, the Little Green Machine Two. I am calling the mechanical and electrical design a Short Stuff Robot.
You can see this information on the
Well school is out and I finally have time to update my website (last update was exactly two months ago today). Anyway, I added some info on the Trinity Fire Fighting Contest 2003, and my entry the Little Green Machine, and the story of his miserable failure, and my new robot for next year.
I also got the source code listings for my earlier robots, which ran OOPic II processors up and on the site.
You can visit the site at
Hey, this is my first entry into my diary. Currently I am working on my new multipurpose robot. It will be the Little Green Machine Two.
The original Little Green Machine was disassembled after it suffered many design flaws. I thought I would go through those failures, and explain some things I picked up along the way.
First off, it turns out that modified servo motors aren't as good as some people say they are, especially under constant running (they are really only suited for a very light robot that won't being running for a while at a time). As they get hot, the RC circuit inside is thrown off, and the timing gets messed up. This means that if you calibrated the motors to have stop in the middle, they will actually rotate when you think they are stopped. Go for broke and buy gear motors with encoders, that is what I am doing for the new robot.
The other problem I had was suspension. The old robot didn't have any and would often get hung up, the new one has suspension on the casters. I am using those little RC air shocks - they are slightly expensive but are smoother than coil springs - and look really cool.
The new robot also has a more powerful, more reliable controller. I was using a Dios - kindof like a basic stamp only bigger, faster and cheaper - from Kronos Robotics (www.kronosrobotics.com) and although I did love the chip, I have to upgrade. The chips are a great learning tool, but I want a C compiler.
Anyways, thats my motivation for designing the new robot and a little bit about the old one. I will post more details as I go along. Right now I am working on getting AVR-GCC customized and ready to go and designing the boards - then its on to making a bootloader and designing the motor controller.
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