barcode scanner sdk vb.net Figure 16-2 Graphic of resistance vs. time to discharge in Software

Generator QR-Code in Software Figure 16-2 Graphic of resistance vs. time to discharge

Figure 16-2 Graphic of resistance vs. time to discharge
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Figure 16-3 Theoretical charging and discharging of a capacitor
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Reading a PotentiometeR: CReating an inPut We Can VaRy in Real time
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will give us insufficient time for the signals to settle down and too large a capacitor will take too long to discharge. In our particular case, a capacitor of 10 micro farads will give us an answer well within 0.01 seconds. This is fast enough for most purposes. Program 16-1 shows how the potentiometer was read, converted to an 8-bit value, and displayed on the LCD.
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Program 16-1 Reading a Potentiometer
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{{Aug 31 09 Harprit Sandhu ReadPot.spin Propeller Tool Version 1.2.6 16 Program 1 READING A POTENTIOMETER This routine reads a 10K pot with a 10 mfd cap. This routine is what is used in the utilities to read the pot. Pot is always read from the same line. }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 PotLine = 19 OBJ LCD : "LCDRoutines4" VAR long long long long startCnt endCount delay PotValue
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'The system clock spec 'Crystal spec 'line the pot it on
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'We will be using these METHODS in this program 'these are the variables we will use. 'count at start 'count at end 'time difference 'Value of the pot reading
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PUB Go LCD.INITIALIZE_LCD 'set up the LCD repeat 'loop dira[PotLine]~~ 'set potline as output outa[PotLine]~~ 'make it high so we can charge the capacitor waitcnt(4000+cnt) 'wait for the capacitor to get charged dira[PotLine]~ 'make potline an input. line switches H>L startCnt:=cnt 'read the counter at start of cycle and store repeat 'go into an endless loop while ina[PotLine]~~ 'keep doing it as long as the potline is high EndCount := cnt 'read the counter at end of cycle and store delay := ((EndCount-StartCnt)-1184) 'calc time for line to go H>L if delay>630000 'max permitted delay delay:=630000 'clamp delay (continued)
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Program 16-1
Reading a Potentiometer (continued)
PotValue:=(delay/2220) 'This reduces the value to 0-255 or 1 byte PotValue <#=255 'clamp range PotValue #>=1 'clamp range LCD.POSITION (1,1) 'Go to 1st line 1st space LCD.PRINT(STRING("PotPos =")) 'Potentiometer position LCD.PRINT_DEC(PotValue) 'print value LCD.SPACE(3) 'erase over overflows LCD.POSITION (2,1) 'Go to 2nd line 1st space LCD.PRINT(STRING("Delay =")) 'Print LCD.PRINT_DEC(delay) 'print value LCD.SPACE(3) 'erase over overflows note It may be necessary to adjust various constants used in the object to suit your particular setup.
In Program 16-2, we are using a method in the Utilities object to read the potentiometer. This is the power of the Spin language. Once we have written a method, we can use it again and again, with just a couple of lines of code, in any object we write. The circuitry for Program 16-2 is shown in Figure 16-4. The code that resides in the Utilities program at this time is shown in Program 16-2. The Utilities object will be added to from time to time as we get further along in the book.
Program 16-2 Code Segment to Read a Potentiometer from the Utilities Object
PUB GetPotVal dira[PotLine]~~ 'set potline as output valutotal:=0 'clear total repeat repval 'repeat dira[PotLine]~~ 'set potline as output outa[PotLine]~~ 'make it high so we can charge the capacitor waitcnt(4000+cnt) 'wait for the capacitor to get charged dira[PotLine]~ 'make potline an input. line switches H>L startCnt:=cnt 'read the counter at start of cycle and store repeat 'go into an endless loop while ina[PotLine]~~ 'keep doing it as long as the potline is high EndCount := cnt 'read the counter at end of cycle and store delay := ((EndCount-StartCnt)-1184) 'calc time for line to go H>L if delay>610_000 'max permitted delay delay:=610_000 'clamp delay PotValue:=(delay/2300) 'Reduces value to 0-255 or 1 byte valutotal:=valutotal+potvalue 'figures total potvalue:=valutotal/repval 'figure average potvalue <#=255 potvalue #>=0 result:=PotValue 'figure average
Reading a PotentiometeR: CReating an inPut We Can VaRy in Real time
Figure 16-4 Complete circuitry for reading a potentiometer
We will not use the technique developed in these programs to read a potentiometer once this technique has been demonstrated. Instead, we will use an A-to-D converter to read the potentiometer(s). This A-to-D converter reads the potentiometers with a resolution of 12 bits to give us a reading between 0 and 4,095. This higher resolution is much more flexible for our purposes and will be used in all the following developments, as detailed next.
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