Build Your Own Combat Robot

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chapter 7 Controlling <strong>Your</strong> Motors Copyright 2002 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
128 F batteries are the source of power for a robot, and motors are the source of movement and locomotion, you might consider the electronic speed controller (ESC) the “ringmaster” of all robot systems. The ESC is the device that controls the amount of voltage that goes to the motors and the direction in which the motors turn in your robot. Without an ESC, you cannot control your robot. The ESC is probably the most critical component in the entire robot, so you must select it carefully. An improperly selected controller will usually result in a short life for your robot and can damage the motors or the batteries. If the ESC fails during a competition, you can pretty much count on losing the match. This chapter will explain several different approaches to implementing electronic speed and direction controls, including simple relay controls and solid-state electronic variable speed controllers. Each approach has its advantages and disadvantages and should be selected according to the application. Relay Control A relay is an electric device used to switch a high-powered electric circuit with a low-powered signal. Inside a relay is an electromagnetic coil and a set of movable electric contacts. When power is sent through the relay coil, it creates a magnetic field inside the relay case. The magnetic field then pulls a piece of metal connected to a set of movable electrical contacts into contact with stationary set of contact points—thus making an electric circuit and allowing power to flow to the load. When the power to the coil is interrupted, the magnetic field disappears and a spring pushes the movable contacts back into their original position, breaking the circuit. Figure 7-1 shows a schematic of a typical single-pole double-throw (SPDT) relay (see the next section for a definition of relay types). Poles and Throws Relays contain one or more circuits. The number of circuits in a relay are referred to as poles. A relay with one circuit is called a single-pole (SP) relay. A relay with two circuits is called a double-pole (DP) relay.
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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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30 Build Your Own Combat Robot Befo
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34 Build Your Own Combat Robot Test
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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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Innovation First Isaac Robot Contro
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FIGURE 8-6 Block diagram of Isaac o
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Chapter 8: Remotely Controlling You
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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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250 Build Your Own Combat Robot One
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chapter 12 Robot Brains Copyright 2
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FIGURE 12-1 From top left to bottom
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Chapter 12: Robot Brains 263 space
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FIGURE 12-2 The BoeBot from Paralla
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Handy Board BotBoard Chapter 12: Ro
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FIGURE 12-5 Robo-Goose, a robotic g
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FIGURE 12-8 A fully autonomous robo
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S ummary Chapter 12: Robot Brains 2
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276 HE referee signals, and my hear
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chapter 14 Real-Life Robots: Lesson
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FIGURE 14-1 Chew Toy Chapter 14: Re
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FIGURE 14-2 Chew Toy with protectiv
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FIGURE 14-3 Wheel shown bolted to d
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FIGURE 14-5 Front view with arm dow
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Final Words Chapter 14: Real-Life R
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Chapter 14: Real-Life Robots: Lesso
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design all the parts, and Dave did
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FIGURE 14-12 The 4-inch-tall alumin
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FIGURE 14-15 Internal view of Live
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330 The Future of Robot Combat The
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336 NLESS you’re building an exac
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340 Build Your Own Combat Robot the
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344 S promised, following are some
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350 Build Your Own Combat Robot Mic
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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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