visual basic barcode scanner input USING THE GP2D02 DIGITAL SERIAL OUTPUT INFRARED RANGING SENSOR in Software

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USING THE GP2D02 DIGITAL SERIAL OUTPUT INFRARED RANGING SENSOR
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The GP2D02 digital serial output infrared sensor is probably the most commonly used of the Sharp units. Its output is an eight-bit serial digital train. The hookup diagram is
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FIGURE 38.16 The Sharp GP2DO5 infrared distance judgment sensor has a one-bit output that is either HIGH or LOW depending on whether an object was detected in the sensor s preset range.
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shown in Fig. 38.17. To use the GP2D02, you must send a clock signal to the sensor, then store each of the eight bits that are returned. Convert those eight bits into a value (from 0 to 255), and this is the range (in noncorrelated units ) from the sensor to the detected object. Listing 38.2 demonstrates a simple Basic Stamp II program for use with the GP2D02 sensor. It displays the eight-bit result from the sensor in the debug window.
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LISTING 38.2.
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DataInput con 0 ClockOutput con 1 StorageVariable var byte RepeatLoop: LOW ClockOutput ' activate detector Pause 70 ' initial wait of 70 milliseconds Wait: If In0 = 0 Then Wait ' wait for output if needed ' shift in data SHIFTIN DataInput, ClockOutput, MSBPOST, [StorageVariable] HIGH ClockOutput ' deactivate detector DEBUG dec StorageVariable, CR ' display result PAUSE 1000 ' waits 1 sec; wait at least 2 ms before repeating GOTO RepeatLoop ' repeat again
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The eight-bit output value of the GP2D02 is not linear, which means that you can t expect a 1:1 ratio between the value you get and the distance separating the sensor and the detected object. For the value to be meaningful, you should conduct tests with objects placed set distances from the sensor (use a tape measure for accuracy). Note the values you get. The higher the value (say, 230 or 240) the closer the object is, and objects closer than 10 cm will yield unpredictable results. Values from 30 to 50 denote objects at the far end of the detection range, which is 80 cm. The accuracy of the readings will depend greatly on the width of the target. You may wish to experiment by placing the sensor in front of a smooth white wall. Vary the distance between wall and sensor and note your results.
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USING THE GP2D12 ANALOG OUTPUT INFRARED RANGING SENSOR
The GP2D12 is similar to the GP2D02 of the last section, except that it provides an analog output rather than a digital one. In some situations (and with some microcontrollers), an analog output is easier to deal with. This is the case if your microcontroller or computer has
WHERE AM I : SIGHTING LANDMARKS
1 2 GP2D02 3 4
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FIGURE 38.17 The Sharp GP2D02 sensor (pinout diagram shown here), which can be connected to a microcontroller or computer using a small diode (the diode drops the voltage to the sensor).
one or more analog-to-digital converter (ADC) inputs. Examples of microcontrollers with ADC inputs include the BasicX (see 32) and the OOPic (see 33). Fig. 38.18 shows the connection of the GP2D12. When powered by 5 vdc, the GP2D12 outputs a voltage that is related to the distance between it and the detected object. The voltage span is approximately 0.6 volts to 3.1 volts. The lower the voltage, the farther away the object is, as shown in Fig. 38.19.
Where Am I : Sighting Landmarks
Explorers rely on landmarks to navigate wide-open areas. It might be an unusual outcropping of rocks or a bend in a river. Or the 7-Eleven down the street. In all cases, a landmark serves to give you general bearings. From these general bearings you can more readily navigate a given locale. Robots can use the same techniques, though rocks, rivers, and convenience stores are somewhat atypical as useful landmarks. Instead, robots can use such techniques as infrared beacons to determine their absolute position within a known area. The following sections describe some techniques you may wish to consider for your next robot project.
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