barcode scanner sdk vb.net Stack[50] Stack1[50] Stack2[50] Freq startTMR StopTMR elapsed pot in Software

Print QR Code in Software Stack[50] Stack1[50] Stack2[50] Freq startTMR StopTMR elapsed pot

Stack[50] Stack1[50] Stack2[50] Freq startTMR StopTMR elapsed pot
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OBJ LCD : "LCDRoutines4" UTIL : "Utilities" PUB GO Cognew (COG_LCD, @Stack) Cognew (FREQ_GEN, @Stack1)
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'These are the methods we will need 'for controlling the LCD 'for general methods 'This the main method in this program 'create Cog_TWO 'create freq generator (continued)
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Reading and CReating Pulses
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Program 18-3
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Code for Original and 5 Output (continued)
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Cognew (COG_OUT, @Stack2) 'create freq out dira[input]~ repeat repeat while ina[input]==0 'hold at low startTMR:=cnt 'start timer repeat while ina[input]==1 'hold at high repeat while ina[input]==0 'hold at low stopTMR:=cnt 'read timer elapsed:=stopTMR-startTMR freq:=10_000_000/elapsed pot:=util.read3202_0 'read Pot 1 PRI COG_LCD LCD.INITIALIZE_LCD REPEAT LCD.POSITION (1,1) LCD.PRINT(STRING("FRQ=")) LCD.PRINT_DEC(Freq) LCD.SPACE(2) LCD.POSITION (2,1) LCD.PRINT(STRING("POT=")) LCD.PRINT_DEC(Pot) LCD.SPACE(2) PRI FREQ_GEN dira[output]~~ pot:=1000 repeat outa[output]~~ waitcnt(clkfreq/pot+cnt) outa[output]~ waitcnt(clkfreq/pot+cnt) PRI COG_OUT dira[freq5]~~ freq:=1000 repeat outa[freq5]~~ waitcnt(clkfreq/freq/5+cnt) outa[freq5]~ waitcnt(clkfreq/freq/5+cnt) 'This is the display, the LCD 'initialize up the LCD 'Routine to write to the LCD ' 'Frequency 'print freq 'erase old data ' 'Frequency 'print Pot reading 'erase old data 'Freq generation based on pot reading 'set output line 'arbitrary non zero value 'loop 'make line high 'wait based on pot 'make line low 'wait based on pot 'output signal generation. 'Set pin direction as output 'arbitrary non zero value 'loop 'make line high 'wait 1/5 time for 5X freq 'Make line low 'wait 1/5 time for 5X freq
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Part III
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The ProjecTs: Using WhaT Was Learned To BUiLd The ProjecTs
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Now that we understand the basics of manipulating the bits and bytes in the Propeller let us use the knowledge we have gained to create some real world applications. Here we will concentrate on developing the type of skills that robot builders would find useful for running various types of motors. The principles used to run motors are universal and can be adapted to serve any device that needs to be controlled with a microcontroller. Pay particular attention to controlling the DC motor with an encoder; it represents all systems with feedback and is the prototypical control application.
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seven-segmenT disPLays: disPLaying nUmBers WiTh seven-segmenT Led disPLays
This chapter is about doing a lot of things so quickly that it looks like they are all being done at the same time. Sometimes we need to display a number consisting of a few digits as a part of the project we are undertaking. The easiest way to do this is to use as many seven-segment LED displays as necessary to get the number displayed. Although it would be possible to light up all the segments necessary to display a number at the same time, the usual practice is to light them one at a time in rapid succession. If this is done right, the human eye/brain cannot tell the difference, and a lot less power and fewer lines are needed to control the display. Instead of two lines for each segment in each number, we can get by with seven or eight lines plus one line for each numeral. Eight lines will be needed if we need to control the decimal points also. The scheme requires considerably less current because we will be lighting only one segment at a time. We are not going to need the 7404 buffers in this program because we will be lighting one segment at a time only and we know the Propeller can handle that without overloading its circuitry. Figure 19-1 illustrates a typical seven-segment display using four seven segment devices. The diagram for identifying the connections to the various segments for the connecting pins of each display is provided in Figure 19-2.
note A typical four-character seven-segment display is good for 0 to 9999.
Program 19-1 uses a potentiometer to vary the time between the illumination of the number again and again. This is a brute-force program that turns the segments on one after another, and the delay between successive illuminations is controlled with the potentiometer. The potentiometer determines how may times each number will be displayed before going on to the next number. Although some segments need fewer
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