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ofthe themomeierwe will coDstruct ea Thecontrollermentioned ier is anextension is in projects construction covercd detail lts in oneof the
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so hardwareandsoltwarecomponents' lhey fiom slanda-rd All instrumentsarc assembled provides function one Eachnodule in the instrument a modularstructure tendto have on you Thefbllowingarc somecommonmodules wouldfind on systensbascd thePIC l6F877A: I t r I I I I I I ! Analoginput section maDipulalions Mathemalical Set the DEFINES for rhe LCD Displayto the LCD or Reada potentrometer two (CRT) Displayto displays Reada keyboard Put out a tone Reada s{'itch module A communications
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aDdassemwe the ordesigning modules need by our We create instr-Lrmentssclecting you a Onceyou havecreated nodulc or subroutrne, canuse into a projectbling them to if it againand againin your designs you orealeit to be easilytransportable olher will savcyou a lol oI time' agrin and againin Takingthe time to closo now designs Notice in the projeclsthat follow that I too uselhe modulesover and over agaiD' ellbrt to useas fcw instruclionsin PIC Basic Pro (PBP)as a I also macle concerted was on the designof ihe insfuments,not on fancy softpossible,so the emphasis ware lricks and routines
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In thj s first project, we build a programmabletachometerthat can delectbelween I and 9999 pulsesa second(or anothertime period) and display the resultson 4 seven in Thesepulses be counted two waysIfwe know can segment LED numericdisplays lhe we aregetting a fixed duty cycle squarewave,we canmeasure total length of a pulse pulses are not coming at a and detemine the frequency of the signal from that If the regular rate, we can actually count the pulsesover time anddeterminethe rate ihat wayWe can write the softwarefor both techniquesso we can seethe differenceAt the end of the project, we will take the sourceof the pulsesinto considerationand discusshow to modify the software to display an actual rpm (revolutions per rlinute) when working with miooprccessors, much of the infonnation we deal with is read are miooprccessors counts, frequencies, the like because and andprocessed pulses, as vdlues il becomes So for analog digitaldevices, areusuallynot designed handljng and impotant that you be comfortable with gathering,processing,and displaying infbrmation of a digital nature, and this project focuseson that aspectof our knowledge and regading microprocessors Onceyou arecomforlablewith the designand understanding you consfuction of this tachometer, will be able to handleall otherfrcquencyinput projects with confidence We will usethe LAB-XI board as a helper instrument as we go along Fhst, we will makethe softwarework on the LAB-XI (when we can) andoncewe know we canrcad, count, and display the inputs the way we want, we will move on to the fabrication of LED based tacbometer showr in Figure151 the seven-segmert dis In this project, the LAB X1 will be particularly helpful becauseseven-segmenl playsrequirea lot or wiring (that cango \\'ong) andit canbe dillicult to get things sorted
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out at timesWhenusinga LAB-XI, we know we havea workingplatiormto develop the softwarewithout having to worry abouthardwareproblemsthat we might have cre softwareworkng we canusethe LABateal o rselvesAfter we havethe tachometer lor to at Xl to createpulsesgenerated known frequencies check the accuracyof the we instrument created, dispiayshasto do with leamjng The displayingof the countson 4 seven-segment displaysItis, ofcourse'mucheasier usedandinexpensive commoniy how to usethese we on to displaythe information the 2 x 20 LCD on the LAB Xl, but in this exercise platlbml If you prefer the proj will be using th- LAB-XI only as our initial software ect caneasily be modified to rul1on the LAB -X 1, but thenyou will missout on the expeIn displays anycase'the PIC we use rienceoflearninghow to usethe sevensegment in for will be lhe l6F8 A(This PIC will be employed all the projects this book' and LAB X1 will be usedto suppoft all the projects as needed) the the The facl that we ar using only four displays is because integer math provided in (65535max),which limits us tofourdisplays only 16 bit math ler thecompi canhandle displayIt also simplifies our problem at this stage if we want to go to a 9 in the Left-most that anal will demonstrate refreshinglbur di splaystakesus to the ma,\imumthat the PIC programmjng lt is also can confol (at 4 MIIZ) without having to useassemblylanguage that has to do with the fact that four digits can be handled easily with a compronrise onednda half pofts (12lines| We will be using a small dc motor with a 2o-slots-per revolution encoder(available (see on encodergeekcom) it asour signalgencrator Figure I 5-2),but from my Website somegeneraldiscussionabout counting pulses before we do that we needto undertake "counts/time penod" areIf you have and what the problemsrelated with low and high someother device tha! can generatepulses,you can use it if you like
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