Build Your Own Combat Robot

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Performance Improvements Chapter 13: Robot Sumo 297 In sumo, two of the most important factors that make a winning bot are strength and technique. Simply having the strongest bot doesn’t mean that you will have a winning bot; and having the smartest bot doesn’t mean that you will have a winning bot, either. Your bot needs both of these skills. Strength is related to pushing power. From physics, we know that pushing force is equal to the coefficient of friction between the bot wheels multiplied by the weight of the bot. This simple relationship pretty much tells you what you need to have in a strong bot: weight and traction. The higher the coefficient of friction, the better the traction the bot will have. The heavier the bot is, the greater the amount of force required to move it. It is best to make your bot as heavy as possible for it’s weight class. For a mini sumo, this is 500 grams. As for traction, soft wheels usually have better traction than hard wheels. Some bots have placed rubber O-rings or rubber bands on the outside diameter of the wheel to improve traction, and others have used foam wheels like you see on model airplanes. Weight and traction are the two most common ways to improve the performance of mini sumos. The other way to win is to use better strategy during the actual contest. This really comes down to the type of programs you use in your bot. Some bots spin more than they move in straight lines. Some bots use more sensors to improve vision capabilities, where others use a stealth approach to keep from being seen. Some bots even use arms to try to capture or corral their opponent. This is what makes robot sumo exciting, because it allows for many different types of bots to enter the competition. In fact, biped and hexapod bots have competed and have even won some matches. The Basic Stamp 1 microcontroller used in this example doesn’t have the memory space for advanced software control. You will need to use a different microcontroller such as the Basic Stamp 2 or the BasicX-24 from NetMedia (www.basicx.com). Various Mini Sumo Robots Figure 13-13 shows a mini sumo named Minimum Capacity built by Pete Miles, one of this book’s authors. This mini sumo uses the circuit shown in Figure 13-11 and the logic shown in Figure 13-12. The actual source code is shown at the end of this chapter. Although this mini sumo is not the best-looking bot on the block, it has placed in the top three positions in tournaments in Seattle, San Francisco, and Los Angeles, and the All Japan Robot Sumo Tournament in Tokyo. One of the most exciting aspects of robot sumo is that any type of robot can be entered into the contests. Pete has also built biped and hexapod walking robots that are fully functional and have won several matches. These robots were built to demonstrate that walking robots can compete in robotic sumo contests. Figure 13-14 shows two photographs of these walking bots.
298 Build Your Own Combat Robot FIGURE 13-13 Mini sumo Minimum Capacity that uses the autonomous circuit presented here. FIGURE 13-14 Legged mini sumo robots; top: Biped Black Marauder, bottom: Hexapod Pete’s Folly.
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Build Your Own Combat Robot Pete Mi
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For more information about this boo
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Contents For more information about
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Current Ratings, 129 How It All Wor
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Object Detector, 290 Sensor Integra
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Acknowledgments We would like to th
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Introduction Some kids spend their
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About the Authors xv About the Auth
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2 ELCOME to the world of combat rob
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22 S we said in Chapter 1, it’s g
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42 OVING is what many might call a
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chapter Motor Selection and Perform
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Chapter 4: Motor Selection and Perf
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FIGURE 4-1 Typical motor performanc
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Determining the Motor Constants Cha
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FIGURE 4-2 Heat generated in an ele
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FIGURE 4-4 Motor power changes by d
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Chapter 4: Motor Selection and Perf
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FIGURE 4-7 24-volt, 185 rpm, 896 in
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the robot. If the engine is used to
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80 LECTRICALLY powered competition
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104 NE of the most important consid
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128 F batteries are the source of p
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chapter Remotely Controlling Your R
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FIGURE 8-1 Wiring and rotational po
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FIGURE 8-2 Futaba’s top of-the-li
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Chapter 8: Remotely Controlling You
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FIGURE 8-4 Typical radio frequency
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FIGURE 8-5 Motor with three capacit
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Innovation First Isaac Robot Contro
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FIGURE 8-6 Block diagram of Isaac o
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chapter 9 Robot Material and Constr
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Metals Aluminum Chapter 9: Robot Ma
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Stainless Steel Chapter 9: Robot Ma
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Titanium used to solder small brass
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Chapter 9: Robot Material and Const
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Welding, Joining, and Fastening We
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place, or some liquid may have ente
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vibration and bounce around the ins
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204 ECAUSE robot combat has evolved
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240 HE robots described in the book
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Page 280 and 281: FIGURE 12-1 From top left to bottom
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Page 340 and 341: design all the parts, and Dave did
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356 OLLOWING are formulas that you
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358 Index 1BDI, 272 1/4 wave antenn
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sources of robot parts, 35 top ten
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INTERNATIONAL CONTACT INFORMATION A
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