generate barcode image vb.net Disprayins potentiometer the wiperpositionon the LCDand the l:lpiiltriiiiilEii LEDbargraph in Software

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Disprayins potentiometer the wiperpositionon the LCDand the l:lpiiltriiiiilEii LEDbargraph
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CI,EAR DEFINE OgC 4 DEFINE IcD DREG PORTD DEFINE I,CD_DBIT 4 DEFINE I,CD_RSREG PORTE DEFINE ICD RSBTE O DEAINE ICD EREG PORTE DEFINE ICD EBIT 1 ADCONI= 0 0000110 IJOW PORTE2 PAUSE 5OO NUIIB VAR BYTE
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; def,ne LCD connections ; , ; ; ; ; ; ; ; deflne LcD connections denne LcD connections deine LCD connections deine LcD connections def,ne LcD connections def,ne LcD connections Make PORTA and PORTE digila1 LCD R/W low (set it to write wait for LcD to start up
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IRtsD = %00000000 A2D VAIUE VAR BYTE
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REAltltlc l POIEI{TIOMEIEBAttD DtSPL,AYlitc THERESULTS tHE LEDBAncBApH Ot{
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the al!lf-6,i!i!ni!i6ll Displaying potenliometer wiperposltionon lhe LCDandlhe (Conttnued) LEDbargraph
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paramerers set nunber of bits in result set cLock source (3=rc) set sampling tine in uS
DEFTAIE ADC BIAS 8 DEFTNE ADC CIOCR 3 DEFXNE [DC-S!!|PLEUS
IJOOP: loop ; sLart lllcl![ 0, A2D VATUE ; read channel 0 to A2D_va1ue SVAIJUE- \, LCDOUT $FE, S80, HEX2 A2D VAITUE, " ", DEC5 A2D VATII'E LCDOUT SFE, $COI BT!I8 A2D VAIUE PORTD=A2D VAIJI'E ; the pause nust cone right afLer serting ; PORTD and befoe PORTD is used again PAUSE 250 setting PORTD before ; try the LCDOUT Go:rO LOOP ; do iL forever END ; end progran
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l:lFii9!!-,!!el: The baslccircuitryfor the threepotentiometers" informarion {The read fron polenLiometerO rs d,spldyed rl-ebargaph Prcgrarr o'1 n 56)
THE READING INFUI THE COI{TBOLIII{G OUTPUTAND
Beep A Simple
We haveoneotherpieceofhardwarcwe canoulputto on thc LAB-XI andthatis the small piezoelectric speakeron the board This speakeris connectedto line PORTC 2 a can be usedto create shol1beep commdnd The PWM (PulseWidlh Modulation) the specines PORIC pin piezoelectric on speaker the LAB_XI The command ofl thc in olthe beep(100milliseconds our case) to be used,the duly cycleandthc duration 57 SeeProgram thai linec2 is a Generates short ione on the piezospeaker(Nole :l!!!'Eii!l$]|:: 1) HPW[jl Channel
CI,EAR DEFIT|IE OSC 4 PW!{ PORTC2, 127 EI{ID
end the progran
in (100psec)beep Circuirryis shown Figure5 5' a Bogram 57provides 01 second Pressthe resetbulton to rcpeatthe beep Check to seewhat happensil you leave the END statementoffduty cyclefor 100cycles a Prcgram generales 50 percent 5
tones i:l!i!f'!Ci$5:: rhe basiccircuilryfor generating providecl you (ll on the piezospeakeron the hardware on appear line44 receiver, slgnaLwill its usethe infrared is circuitry shown) Onlyrelevant
A SIiIIPLEBEEP
It dennes thatwe areusinga4 MHz oscillaror PORTC2 specifies pin to be used the 127specifies 50 percent a duty cycle;the rangeof the variableis from 0 to 255 I 00 specifies thetoneis rolastfor 100of rhe256ON-OFFsteps defineonecycle that rhat In the PWM command,the fiequencyandlcngth of the signaigenerated dependenr are on theoscillator frcquency our case, is 4 MHz, andonecycleis about25milliseconds In this long (00025secondt Notethattheline C2 is alsoconnectcd theoutputfor a possible to phonejackandto an IR LED that can be used to interact with IR receiven Theserwo connectionsate not populatedon the PC board as received but they can be addedwithout diificulty Two fypesof signalscanbe annunciared rhe speaker prcgrammedfrom the comon as piler The PWM commaod can senda signalof a fixed duty cycle ior a fixed number of cycles, and the HPWM commandcan set up a PWM signal thal nns continuouslt in thebackgmundIneilhercase, signalneeds be Fovided on thePORTC2 the to pin because is wherethe speaker connected that is However the normalpWM (nor rhe background IIPWM) conrmandsignal canbe madeto appearat any availablepin The back ground HPWM signal can be modified "on the fly" in a progl:rm The HPWM signalscan only be madeavailable pin PORTC2(Channelt) and ar PORTCI(Channel2) Yes,the pin nurnbers reversed! the PIC 16F877A, are In rlrcre are only two IIPWM channelsand rhesetwo pins are connectedpemanently to these (SomePICdevicesprovide twochannels morethantwo channels thedatasheets) See Since we have the speakerhardwired to PORTC2,we can only useHPWM Channel I tbr the tones we generate, As seen Figure55,these in signals alsobe usedto generate can telephone tones dial (DTMF) and inftared (IR) signals when provided wirh rhe appropriarehardwareWe will concentrateon creating toneson the piezo speaker The w ing and programrning is the samefor the other devices;they are all wircd in parallel Just changeihe paramProgran 58 is a slightly morecompljcatedprogramanddemonstrates useof PWM the to controlthe brightness oneof the LEDSin the bargraph of
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