vb.net read barcode from camera UNDERSTANDING THE OUTPUT OF THE ADXL202 in Software

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35.3.2 UNDERSTANDING THE OUTPUT OF THE ADXL202
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The ADXL202 delivers a PWM with a varying duty cycle. The duty cycle or timing of the pulses, defined as T2, is set by R1. For this application, the pulses are 5 ms apart. Changes in acceleration change the width of each pulse. For the ADXL202, the pulse width changes 12.5 percent in each way for each g of acceleration. Therefore, the width of these 5-ms pulses will change by 50 percent for the entire 2-g range of the device. A zero g state has a 50 percent duty cycle, while a 1 g acceleration will have a 25 percent duty cycle (2.5 ms pulse width) or 75 percent duty cycle (7.5 ms pulse width), depending on the direction of the acceleration. The period of the PWM signal is defined as T1. Because the ADXL202 uses a pulse width modulated output, rather than a linear DC output, no analog-to-digital conversion is necessary.
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+5 vdc (Stamp Pin 6) C1 0.1 13 14 Pwr
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Self test (Stamp Pin 0) X Output (Stamp In 2) Y Output (Stamp Pin 4)
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11 C1 0.47 12 C2 0.47 4
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9 ADXL202 5 R1 620K Gnd 7
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(To Gnd on Stamp)
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FIGURE 35-3 A basic schematic diagram for using the Analog Devices ADXL150 single-axis accelerometer.
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EXPERIMENTING WITH TILT AND GRAVITY SENSORS
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TABLE 35-1 IC1 R1 C1 C2, C3 Misc.
ADXL202 Test Circuit Parts List ADXL202 acceleration sensor 620k resistor 0.1 F capacitor 0.47 F capacitor BS2 on development carrier board, PC for programming and interfacing
35.3.3 ORIENTING THE ACCELEROMETER
Because the ADXL202 has two axes, it can detect acceleration and gravity changes in two axes at once. You can use the device in vertical or horizontal orientation. As a tilt sensor, orient the device horizontally; any tilt in any direction will therefore be sensed. In this position, the ADXL202 can also be used as a motion detector to determine the speed, direction, and possibly even the distance (given the resolution of the control circuitry you use) of that movement.
35.3.4 CONTROL INTERFACE AND SOFTWARE
The control interface for the ADXL202 is surprisingly simple. Fig. 35-4 shows the hookup diagram for connecting the ADXL202 surface-mount chip and evaluation board to a BASIC Stamp 2. In both cases, power for the 202 comes from one of the Stamp s I/O pins. As mentioned in an application note written by an Analog Devices engineer on the subject of interfacing the ADXL202 to a BASIC Stamp, this isn t the overall best design choice, but for experimenting it s quick and simple. The following is a short program written in PBASIC for the BASIC Stamp 2 that allows continual reading of the two outputs of the ADXL202. The program works by first determining the period of the T2 basic pulse. It then uses the PULSIN command with both the T1y and T1x axis signals. PULSIN returns the length of the pulse; a longer pulse means higher g; a shorter pulse means lower g.
Freq Var Word T1x Var Word T1y Var Word T2 Var Word Low 0 Input 2 Input 4 High 6 ' ' ' ' self test, pin 0 X accel, pin 2 Y accel, pin 4 V+ pin 6
Count 4, 500, Freq T2 = Freq 2 do debug cls Pulsin 2,1,T1y
35.3 CONSTRUCTING A DUAL-AXIS ACCELEROMETER ROBOTIC SENSOR
FIGURE 35-4 Connection diagram for hooking up an ADXL202EB (evaluation board) to a BASIC Stamp 2.
T1y = 2 T1y Pulsin 4,1,T1x T1x = 2 T1x T1y = 8 T1y / T2 T1x = 8 T1x / T2 debug dec T1x, tab, dec T1y, tab, cr Pause 150 loop
Because the BASIC Stamp 2 has a clock frequency of 2 s, the actual time of the T1y and T1x pulses are converted to microseconds with the lines
T1y = 2 T1y T1x = 2 T1x
T1y and T1x are the pulse widths, in microseconds. These widths are then referenced to the T2 value previously obtained by the program with the lines
T1y = 8 T1y / T2 T1x = 8 T1x / T2
The typical results of this program are numbers like 200 and 170, for the x and y axes, respectively. Note that even on a flat surface, the two outputs of the ADXL202 may not exactly match because of manufacturing tolerances.
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