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I.6 Conventions Used in This Book
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Mechanical drawings, schematics, and other diagrams have been created using standard conventions and should not look significantly different from other graphics found in different sources. The basic symbols used in the diagrams will be explained as you read through the book. If there continue to be symbols or components that are confusing to you, please look at the different reference material listed in the appendices. Integrated circuits are referenced by their part number. Remember that the part number and the operation of the part can vary when different technologies are used. This means that when you are given a TTL chip of a specific technology (i.e., LS) do not assume that other chips with the same part number, but different technology, can be used. Details on the specific parts used in the circuits are provided in the parts list tables that accompany the schematic. Refer to the parts list for information on resistor and capacitor type, tolerance, and wattage or voltage rating. In all full-circuit schematics, the parts are referenced by component type and number.
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IC means an integrated circuit (IC). Some integrated circuits will be referenced by their part number or function if this simplifies the explanation of the circuit and there are many different substitute parts available. R means a resistor or potentiometer (variable resistor). All resistors are 1/4 W, 5% tolerance, unless otherwise specified. C means a capacitor. Capacitors can be of any type unless specified. D means a diode, a zener diode, and, sometimes a light-sensitive photodiode. Q means a transistor and, sometimes, a light-sensitive phototransistor.
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INTRODUCTION
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LED means a light-emitting diode (most any visible LED will do unless the parts list specifically calls for an infrared or other special-purpose LED). XTAL means a crystal or ceramic resonator. Finally, S or SW means a switch; RL means a relay; SPKR, a speaker; TR, a transducer (usually ultrasonic); and MIC, a microphone. Enough talk. Turn the page and open your map. The treasure awaits you.
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ROBOT BASICS
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Copyright 2006, 2001, 1987 by The McGraw-Hill Companies, Inc. Click here for terms of use.
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CHAPTER
THE ROBOT EXPERIMENTER
lone he sits in a dank and musty basement, as he s done countless long nights before; pouring over plans, making endless calculations, and then pounding his creation into being. With each strike of his ball-peen hammer, an ear-shattering bong and echoes ring through the house. Slowly, his work takes shape and form it started as an unrecognizable blob of metal and plastic, then became an eerie silhouette, then . . . Brilliant and talented, but perhaps a bit crazed, he is before his time an adventurer who belongs neither to science nor fiction. He is the robot experimenter, and all he wants to do is make a mechanical creature that will ultimately become his servant and companion. The future hides not what he will ultimately do with his creation, but what his creation will do with him. Okay, maybe this is a rather dark view of the present-day hobby robotics experimenter. But though you may find a dash of the melodramatic in it, the picture is not entirely unrealistic. It s a view held by many outsiders to the robot-building craft. It s a view that s over 100 years old, from the time when the prospects of building a humanlike machine first came within technology s grasp. It s a view that will continue for another 100 years, perhaps beyond. Like it or not, if you re a robot experimenter, you are considered to be on society s fringes: an oddball, an egghead, and yes, let s get it all out possibly someone looking for a kind of malevolent power! As a robot experimenter, you re not unlike Victor Frankenstein, the old-world doctor from Mary Wollstonecraft Shelley s immortal 1818 horror thriller. Instead of robbing graves in the still of night, you rob electronic stores, flea markets, surplus outlets, and other spe3
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