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j ; De6ne LCD conneclions ; ; ; ; , ; this nust be set if you are using the IrD ; it mkes the A & E analog ports digital _ \ 6 - _ - i a b - e s w a w j I I l s e
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CI,EJAR DEFINE OSC 4 DEFINE LCD_DREGPORTD DEFINE LCDDBIT ' DEFINE LCD_RSRTG PORTE DEFINE LCD_RSBIT O DEFINE LCD-EREC PORTE DEFINE LCD_EBIT 1 I,OW PORTE2 aDCONI=%00000111 PAUSE 500
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-r: TRISC - %00000011 TRISD %11110000 P O R T D= % 0 0 0 0 0 0 0 0 AjJPEA VAR WORD RPM VAR WORD ; Then display lhe
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LCDOIIT SFE, S01, \Tachctrteter PAUSE 250 oop r,t oisp dys ; -fe , now ready !o be crealed
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LOOP! ; the display loop couNt PoREco 250, ArPIra ; read lhe counls into lhe RI,!d=50*a!PIIA*4/5 ; convert counls !o ipn " \ ; print ICDOIIT SFE, 9C0, DECII RPM, on line 2 GoIo IooP ; do it forever END
It's that simple with the LAB-Xl and the PBPcompiler Next,let's design the software for the 4 seven-segment displays Four of them will
for allow for a mfiimum displayof 9q99(but sincewe arc takingsamples 025secper onds, we have20counts revolution, ma,\imum we canrecognize and the lpm withoutreducing sampling is 119,400) the time
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Max counl:9999in 025secords 39996in I second which givcs: Thereare20 countsper revolution, per 19990 rcvolutions secordr,or per (39,996/204"60 rcvolutior\s minute rpm if we count20 counts Wc can detect(but no! display)a maxinum of 119,940 If and perrcvolutionfor 025seconds we wantto detect displaya higherrpm,we musl the count or reduccthe time intervalin thc COUNT instruction dccrease eDcoder We have alreadyset up PORTD with the lower 4 biN as oumu$ (but if we had not we decision-naking wouldhave1() theline of codeto do thaoAfter insering an appropriate add instruction,we can uscany of thesepiDsfor an output signalto nn apFopriate device in 5, as lf we amplify the signalappropriately, covercd the signalon anyof or pins mentioDed canbe usedto controla heater punp or whatever carlier the output elscwe havein mind
DISPLAYS SEVENSEGMENT
displays comein two types:conlmonanodeandcommoncathodeln Scvcn-segment lo bolh rypes, onesideof a1lthc LEDSis wired together makea commonconneclron (CA) displays only (seeFigure 15 7) we In our expenments, will usecommonanode l-ED displaysrctually haveeight or nine LEDSin them Most so-calledseven-segment The eighthandninth LEDSare the decimalpointson one ol two sidesof the number only seven poinlsforthis project, wewill need so We displayed willnotusethedecimal poinl ofeach one lines,but we will wire in theeighthline ofthe po to activate decinal futurcuse displayfor possible arc a Firstwe needto unders[and litl]e bit abouthow sevensegmentdisplays used haveonecommonleg, lhe onc that LED display, the segments all In a sevensegment ()1lheLEDs,and whenthe The datais impressed theotherends on will goto theanode gets power,whalevcr is impressed thesegments on to dala legis connected the common alsoall bulthey can are turnedonThe segments turnedon oneal atime in mostcases, pin Often,therewillbe morethanoneanode on adisplay, bc turnedon sinullaneously These extn pins areproinsidethe display together bul allofthem will be connccted to vided1() makcit easier lay ou1the wirjng on a printedcircuitboard are in for All the displayscgnrents eachof ihe displays connected parallelto the data line to port,andeachofthe con lon linesis assigned a scparate from linesto ore PIC is eneryizrd oneat a time porl Eachofthe seven-segment modules the PIC on anothef so in rapid succession thatit sccmsto the humaneyethat they are all on at the same must be lit and how often the disphy must ljmc Decidinghow ]ong cach segment you basis1i11 comeup with lhc bestdiscan be doneon a trial'and-effor bc rcfieshed The play possibleunderthe circumstances segnentsarc all the samesizetso they less is requircthesame cunent,butthedecimalpoint smallerandnccds cuffentIt 1nay be necessary powerit for a shorterlimc or providea largerrcsistorfor it to malch to olall thc othersegnents the brightress
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