visual basic barcode scanner input Limitations of the Piezo Disc Accelerometer in Software

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Limitations of the Piezo Disc Accelerometer
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While the piezo disc makes for a cheap and easy accelerometer, it s not without its limitations. Here are two you will need to consider:
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I The disc will only measure changes in momentum since it is inherently an AC device.
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Once the momentum of the disc normalizes, the output voltage will fall back to its nominal state. Since gravity acts like a constant DC signal, this means you will not be able to use the piezo disc as a tilt sensor very easily. I The output of the piezo disc can easily exceed the input voltage of your PC, microcontroller, or other interface electronics. Should the disc receive the blow of a sharp impact, the voltage output can easily exceed 20, 50, and even 100 volts. For this reason, you
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694 EXPERIMENTING WITH TILT AND GRAVITY SENSORS
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must always place a zener diode to act as a voltage clamp, as shown in Fig. 29.14 of 29. Select a zener diode voltage that is compatible with the input voltage for the interface you are using. For example, if the interface voltage is 5 vdc, use a 5.1-volt zener. I The piezo disc is basically a capacitor so it stores a charge over time. You can reduce the effects of the capacitive charge by placing a 50K to 250K resistor across the output leads of the disc (this will help to bleed off the charge). You may also want to feed the output of the disc to an op amp.
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Connecting hardware to a computer or microcontroller Using the Basic Stamp with an accelerometer Using the BasicX microcontroller with an accelerometer Navigating through an environment
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29, Interfacing with Computers and Microcontrollers 31, Using the Basic Stamp 32, Using the BasicX Microcontroller 38, Navigating through Space
TIPS, TRICKS, AND TIDBITS FOR THE ROBOT EXPERIMENTER
Most every book has a straggler chapter that really doesn t fit with the rest. Well, this
is the straggler chapter for Robot Builder s Bonanza. It contains various odds-and-ends discussions about robot building, including some of my own personal methodologies, rants, and observations.
But First
All robots are different because their creators have different tasks in mind for their creations to accomplish. A robot designed to find empty soda cans is going to be radically different from one made to roam around a warehouse sniffing out the smoke and flames of a fire. Consider that a true robot is a machine that not only acts independently within an environment but reacts independently of that environment. In describing what a robot is it s often easier to first consider what it isn t:
I Your car is a machine, but it s not a robot. Unless you outfit it with special gizmos, it
has no way of driving itself (okay, so Q can make a self-running car for James Bond). It requires you to control it, to steer the wheels and operate the gas and brake pedals, and to roll down the window to talk to the nice police officer.
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696 TIPS, TRICKS, AND TIDBITS FOR THE ROBOT EXPERIMENTER
I Your refrigerator is a machine, but it s not a robot. It may have automatic circuitry that
can react to an environment (increase the cold inside if it gets hot outside), but it cannot load or unload its own food, so it still needs you for its most basic function. I Your dishwasher is a machine, but it s not a robot. Like the refrigerator, the dishwasher is not self-loading, may not adjust itself in response to how dirty the dishes are, and cannot be reprogrammed to accommodate changes in the soap you use, nor can it detect that you ve loaded it with $100-a-plate porcelain so go easy on the rinse cycle, thank you very much. Other machines around your home and office are the same. Consider your telephone answering machine, your copier, or even your personal computer. All need you to make them work and accomplish their basic tasks. A real robot, on the other hand, doesn t need you to fulfill its chores. A robot is programmed ahead of time to perform some job, and it goes about doing it. Here, the distinction between a robot and an automatic machine becomes a little blurry because both can run almost indefinitely without human intervention (not counting wear and tear and the availability of power). However, most automatic machines lack the means to interact with their environment and to change that environment if necessary. This feature is often found in more complex robots. Beyond this broad distinction, the semantics of what is and is not a robot isn t a major concern of this book. The main point is this: Once the robot is properly programmed, it should not need your assistance to complete its basic task(s), barring any unforeseen obstacles or a mechanical failure.
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