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The valueof numbers writtento the LCD canbe specified with prefixes thatdetermine if the valuewiil be displayasa binary,a hexadecimal, a decimalvalueSeethe PBP or manual details for BIN specifies the displaywill be binar) that HEX specifies the displaywill be in hexadecimal ihat format DEC specinesthat lhe display will be in decimal format In hogram 55, the valueof "NMBR" is setto 170arbitrddly (actuallybecause alterit natesls and0s in binaryfonmt) Any numberbelowor equalto 255could havebeenused Using BIN8 insteadof BIN displaysall 8 bits Using Hex2 insteadofHEX displaysboth hex digits DEC5 can display all fivl decimal digits becausewe are limited to 16 bits
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FEAOII{G A P]OTEIITIOMETERAI{D DISPLAYINGII{E RESIIITS ON THE fEO BANGNAPH
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(65,535) integer and mathin PICBASIC BIN16canbeused 2-bytewordsto display for all 16bitsAny number digitsup to 16 canbedisplayed of ill!ijliiliii:qoall writins io the LcD disprayin FULLb;nary hexadecimar, decimal and
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CLEAR DEFINE OgC 4 DEFINE IJCD DRIC POR'D DEFINE LCD_DBIT 1I DEFINE I]CD RSREG PORTE DEFINE IJCD_RSBIT O DEFINE I,CD EREC PORTE DEFINE LCD EBIT 1 ADCON1-%00000110 IOIT PoiRTE2 PAUSE 500 NMAR VAR BYTE TRISD = %00000000 NMBR = %10101010
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deine LCD connections def,ne LcD connections define LCD connections def,ne LcD connections define LCD connections deflne LCD conneciions rnake PoRTA and PORTE dlgiraL rcD R/\'i 1ow ('rite) We will do no xeadins wait for LCD to starL up assign variable D7 this D0 = all outpuls is decimal 170 DEC5 N!|BR,"
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rcDou! $FE, $80, BrNS i{MBR,z \,HEX2 NUBR, ,
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Readinga Potentiometer Displaying and theResults theLED B on
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Eachpotentiometeri s placedacrossground and5 volts alrdthe wiper is readon the A/D line (Other reference voltagesand resistances be specified can and used-see the datasheet) potentiometer The valuehasto be high enoughso as not to act as a short betweenthe power and ground 5K ohms as a minimal value is okay (Extremely high values make for ajittery reading) When we read a potentiometer the MCU divides the voltage acrossthe potentiometer into 256 steps beiween and255 andgivesus the numberthatrepresents posi0 the tion ofthe wiperacross connected the voltage Neitherthevoltage theresistance nor of thepotentiometer relevanl(thoughitcanbe if we know theminimumandmaximum is voltageacross pot) What we aregettingis the relative position of the wiper expressed the (ThePIC alsohasa 10-bitresolution asan 8-bitnumber capability seethedatasheet andPICBASICmanual) The overall resistance eachof the threepotentiometers placedacross5 volts, and of is lhe threePORTAlines readthe position oithe three persThe potentiometers read ar ass-bit values usingan s'bitA to D converterThis givesa full-scale reading from of
COI{TNOLLING THE OUTPUTAND REAOITIG THE INPUT
0 to 255for ail dueepotentiometen,no matterwhatthe actualtotal rcsistarcevalueof edlh potentiometer you want to readthe resistance ohms,you must divide the readingby If in (Again,thepotentiometer 255 andmulriplyby thelotal resistance olthe potentiometer value must be high enoughso the potentiometer doesnot act as a shon bctweenglound andthe MCU power comeclion 5K lo 10K ohmsis a good seleclionfor most purposcs) Next, we will rcadjust oneof the potentioneten (theonenearest edgeof theboard) the to an accuracy 8 bits anddisplaytheresults the rightmost of on eightLEDSof the LED bargraph This potentiometer connected pin 2 ofthe PIC (alsoidentified RAo is to as andaspin PORTA0) will displaytheresultof thevalueread(0 to 255)on thebarWe graphby loading the readinginlo PORTDSince PORTDis connected the eight to LEDS,this will automaticallygive us a binary rcpresentation the dataln the next step, oi we will display the inlormation on the LCD dispiay as alphanumericdata(which js, of course rnucheasier read) to prcgramto not only disptayb the baryraph alsoput theinformationon Expndi4 the but theLCD display, havea prcblemin thatthe PORTDlinesaresharcd rlrebargmph we by and fie LCD displayWhenwe run theprogram,we will noticeilat dEre is a backgmund noisy as blinking of the LEDSin the bargraph the l,CD is uritten to, b t atur that is donethe bargraphdisplays datalrom thepotentiometer expected we hadhardware software If the as and thatcould suppress LEDSwhcnwc werewriting to lheLCD, thisproblemcouldbe elimthc inaledTheopention observed demonslrates thechip select allowsusto usethelines du1 line of PORTDto controlboth the I-ED ba raphandthe LCD displayOncewe are donewith writing to the l-CD we canloadthe datainto POR'ID andpause pogmm to allow us lo the readthedisplayNoticethatthe pause/delay mustcomeimmediately aftersettingPORTDto A2D Valuefor this to work properlywhen we do wha!,is importantwhenusingmicrccontrollersProgram56 showsus how thisis doneandFigure54 showstherclevantcinruiiry
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