barcode scanner sdk vb.net Figure 16-8 Wiring diagram for a two-channel MCP3202 A2D module in Software

Print QR Code 2d barcode in Software Figure 16-8 Wiring diagram for a two-channel MCP3202 A2D module

Figure 16-8 Wiring diagram for a two-channel MCP3202 A2D module
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Figure 16-9 Wiring diagram for an eight-channel 3208 A2D module
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Rule From here on out, whenever we need to read a potentiometer (or anything
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else), we will use the MCP3202 A-to-D module as our peripheral chip to do so. We will always read the device to a resolution of 12 bits so that we will always get a value between 0 and 4,095.
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note A photograph that supports this wiring is shown in Figure 16-6. note Two channels are shown, each represented by one potentiometer.
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When you need to read two lines, you can use the wiring setup shown for an MCP3202 in Figure 16-10, later in this chapter. Only one potentiometer is shown there, but two can be read. The code for the eight-line 3208 chip is not given but can be easily developed from the code for the 3202 (see the data sheet). You have to use three clock/read cycles in the code so that eight lines can be specified.
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note When using an A2D chip, you cannot connect the input channels to the input lines of the Propeller. They must be kept completely free of any extraneous load whatsoever if they are to read accurately. The output from the A2D as read by the Propeller depends on which line is specified as being interrogated. Thus, the four SPI lines to the Propeller can read all eight lines on an MCP3208.
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using the PotentiometeR Reading in the led Blink PRogRam
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This section introduces the use of the waitCnt command (as modified by the potentiometer reading) to control the rate at which an LED blinks when we ground an input line. We will use the same setup as was used for Program 16-1 and will modify the software to do this. The wait method uses the waitCnt command to determine how the LED cycles on and off when the switch is pressed. The purpose of this program is to demonstrate the use of the waitCnt command. The waitCnt command pauses the system until the system clock matches the argument of the command. The command is written as
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waitCnt(waitPeriod + cnt)
where waitPeriod is the delay desired in clock cycles and cnt is the current reading of the 32-bit system counter or clock. The instruction must be used exactly as written here.
note WaitPeriod must be more than 381 cycles of the clock because of the time it takes to execute the command. Any number below 381 is likely to stall the system or give unpredictable results.
The waitCnt command uses the system clock to delay the program by a number expressed in clock cycles. The system clock is a 32-bit counter that increments by 1 during every clock cycle. The number of times the clock overflows is not kept track
Reading a PotentiometeR: CReating an inPut We Can VaRy in Real time
Figure 16-10
Wiring schematic for blinking an LED and reading a potentiometer
of by the system. The instruction only uses the difference in the counts to create the delays. If a delay that is more then 32 bits is specified, a problem will occur that has to be handled by the programmer. Delays expressed by numbers that exceed 32 bits are very unlikely to be needed within our programs. The wiring schematic for this program is illustrated in Figure 16-10; the program for blinking the LED as controlled by the potentiometer delay is listed in Program 16-4.
Program 16-4 Blinking an LED at a Rate Controlled by a Potentiometer
{{12 Sep 09 Harprit Sandhu BlinkLEDpot.spin Propeller Tool Ver. 1.2.6 16 Program 4 This program turns an LED ON and OFF, with a pot set delay. Define the constants we will use. }} CON
(continued)
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Program 16-4
Blinking an LED at a Rate Controlled by a Potentiometer (continued)
_CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 inv_high inv_low output_pin =0 =1 =27
'The system clock spec 'the crystal frequency 'define the inverted High state 'define the inverted Low state
'High is defined as 0 and low is defined as a 1 because we are using an 'inverting buffer on the Propeller output. VAR long long byte
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