barcode scanner vb.net textbox STRAIN GAUGES in Software

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Obviously, the home-built pressure sensors described so far leave a lot to be desired in terms of accuracy. If you need greater accuracy, you should consider commercially available strain gauges. These work by registering the amount of strain (the same as pressure) exerted on various points along the surface of the gauge.
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562 ADDING THE SENSE OF TOUCH
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3 2 20 Resistance 1 (k ohms) 1 5 0 0 1 2 3 4 5 6 Pressure (ounces) 7 8 9 Press Release
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FIGURE 35.6 The response curve for the conductive foam pressure sensor. Note that the resistance varies depending on whether the foam is being pressed or released.
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Strain gauges are somewhat pricey about $10 and over in quantities of 5 or 10. The cost may be offset by the increased accuracy the gauges offer. You want a gauge that s as small as possible, preferably one mounted on a flexible membrane. See Appendix B, Sources, for a list of companies offering such gauges.
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CONVERTING PRESSURE DATA TO COMPUTER DATA
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The output of both the homemade conductive foam pressure transducers and the strain gauges is analog a resistance or voltage. Neither can be directly used by a computer, so the output of these devices must be converted into digital form first. Both types of sensors are perfect for use with an analog-to-digital converter. You can use one ADC0808 chip (under $5) with up to eight sensors. You select which sensor output you want to convert into digital form. The converted output of the ADC0808 chip is an eight-bit word, which can be fed directly to a microprocessor or computer port. Fig. 35.7a shows a the basic wiring diagram for the ADC0808 chip, which can be used with conductive foam transducer; Fig. 35.7b shows how to connect a conductive foam transducer to one of the analog inputs of the ADC0808. Notice the 10K resistor in Fig. 35.7, placed in series between the pressure sensor and ground. This converts the output of the sensor from resistance to voltage. You can change the value of this resistor to alter the sensitivity of the circuit. For more information on ADCs, see 29, Interfacing with Computers and Microcontrollers.
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Experimenting with Piezoelectric Touch Sensors
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A new form of electricity was discovered just a little more than a century ago when the two scientists Pierre and Jacques Curie placed a weight on a certain crystal. The strain on the
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EXPERIMENTING WITH PIEZOELECTRIC TOUCH SENSORS 563
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7 6 5 4 Analog Inputs (8) 3 2 1
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21 20 19 18 8 15 14 17 7
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Digital outputs
End of conversion
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Foam transducer To ADC input (0-7) 10K
FIGURE 35.7 a. The basic wiring diagram for converting pressure data into digital data, using an ADC0808 analog-to-digital converter (ADC) IC. You can connect up to eight pressure sensors to the one chip. b. How to interface a conductive foam sensor to the ADC0808 chip.
crystal produced an odd form of electricity significant amounts of it, in fact. The Curie brothers coined this new electricity piezoelectricity ; piezo is derived from the Greek word meaning press. Later, the Curies discovered that the piezoelectric crystals used in their experiments underwent a physical transformation when voltage was applied to them. They also found that the piezoelectric phenomenon is a two-way street. Press the crystals and out comes a voltage; apply a voltage to the crystals and they respond by flexing and contracting. All piezoelectric materials share a common molecular structure, in which all the movable electric dipoles (positive and negative ions) are oriented in one specific direction. Piezoelectricity occurs naturally in crystals that are highly symmetrical quartz, Rochelle salt crystals, and tourmaline, for example. The alignment of electric dipoles in a crystal structure is similar to the alignment of magnetic dipoles in a magnetic material. When the piezoelectric material is placed under an electric current, the physical distance between the dipoles change. This causes the material to contract in one dimension
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