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Libby the Robot |
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Since we used our Dual Processor Robot Controller board, we have -
Servos Two modified model airplane servos provide the power to the robot in a standard configuration. Because this causes the wheels to exert a sideways load on the output shaft, we used Hitec® HS-425BB servos with dual ball bearings. A little more expensive, but they are quieter and smoother than many other servos. Base The base is approximately 8" wide x10" long. Lots of space was left on the back to give room for expansion. We can add solderless breadboards, LCD panels, sound systems, line followers, or custom PC boards with all kinds of subsystems. It is made of gray Type I PVC. That means it is light and strong while being easily drilled or glued. The drive wheels are 3" diameter model airplane style foam wheels. The tail wheel is model airplane style, 1 ¼" diameter, and mounted on a custom built-in swivel. Rounding the corners off in the back helps maneuver in tight places. Bumper You have probably noticed the HUGE front bumper. We call it an SUV bumper. Our development work showed that the simple bowtie loop and whisker bumpers weren't very effective in the tough areas around the house. This included places like under the kitchen table. We found the more complicated bumper worked much better at keeping the robot out of places where it would get stuck. It still goes under our kitchen table but now it can successfully come back out! It is made from 1mm (0.039") music wire. You can get it at a hobby shop. Use eye protection and BE CAREFUL when cutting or bending it! Music wire will ruin your precise electronic cutters. A hobby grinder can cut it using a cutoff wheel. You can solder it with a larger iron or soldering gun. We wrapped the joints with copper "bus" wire to hold the pieces together while soldering. As you can see, the bus wire can just stay there after soldering. Make sure to smooth the edges so nothing sharp remains. | ||
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Blue Bell Design Inc. Post Office Box 446 Gwynedd Valley, PA 19437-0446 USA 215-643-7012 email us harry@bluebelldesign.com on the web www.bluebelldesign.com BASIC Stamp® is a registered trademark of Parallax, Inc.
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