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PROJECT 6
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program-the louchpanel Finat sesment make finished to a
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; check pholo for ; turn on colm coL 4 and save if is I
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rF PoRTB3=1 IHEN col=4 PORTC=%11111110 PAUSE 2
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ROW=I
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; check photo for ; i f i s l
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row 1 and sawe
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PORTC=%11110111 PAUSE 2 IF PORTBs-1 IIIEN PORTC= 11111111 FETURN
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ROW=2
pause needed for LED to react check photo for row 2 and save if turn everylhing off
DISPITAY: LCDOIIT SFE, $80,r'R-lrDECl D=z,DEC3 TIM1
shov setection
R O W' z C=/'DECl
and PoRTB and c
COIJ,/ D-l,DEC3 Tlldo,/-
LCDOs:r sFE, $C0, B"
RITI'RN DO_IT: SELECT CASE ROW CASE 1 SEI,ECT CASE COI,
BINS PORIIA, \ Cz, BrNS POREC roLi-e era!es 6r_re o_ ce ec!io,s f,rs! look a! Lhe rows ROW 1 look a! lhe coLms
CASE 1 IF t CD_ONE=I THEN LCD_ONE=0 ICD_1- INACEtItE EIJSE LCD_1=ACt1 LCD_ONE-l STAT_1=GI,oW TIu0=10 EDIDIF GOSI'B PAI'SER
LcD in oN as inactive
set i!
lomonoe( t 's qlow'rs ro reset tine !o 10 count end of conpailson pause !o de-bounce
bl-nr'_q
CASE 2 rF LCD-l=acTrvE I'IIEN , IF STAT_1=GIrOW THEN ; STAT,1-BIJIIiIK ; turn ELSE ; else STAT-I-G'JOW ; turn I,cD_OliIE=1 ; turn
ENDIF
react if it lt to it il
if only lhe is gLovinq blinkiner
LED is
to glot on
Gostt3 PAUaEB
ETIDIF
; end of conparison ; pause to de-bounce ; end of conparrson
BUILDING SIIIIFLEEIGHTBUITOI{ A TOUCHPAIIEL
l|Fl$ltli tf,A(li]t (Continued'l
Flnalsegment makea linishedprosram-the touch panel lo
CASE 3 ; colunm 3 TIMoETIr[o-1 ; decrease time to make faster blink IF TIlr0 <1 THEN TIt{0=1 ; if it is too low keep it at of 1 , iinimm GOSTB PAUSER1 ; delay for de bounce CASE 4 ; coLum 4 TIMo=TIMo + 1 ; increnenL the delay tiner IF TIMo >20 TI@I ll!t0=20 ; if it is too high, set it as ; diqh PAUSER1 GOSITB ; delay for de bounce CASE ELSE else ; here if Lhere was sonething EIID SELECT of all the xows ; end of selection CASE 2 sErJEcT casE col, CASE 1 IF LCD_T9iO=1 EEN T LCD_TfiO=o
IJCD_2=IIiIACTM EIJSE IJCD_2=ACTM LCD_TflO=1 STAT_z=GIJOW i
; taN2 ; look at the colllms i (ooa orp--\a,-s r-e i was done for row 1 abowe line ; for tine
; i i
EIM1=1o
ENDIF
; CASE2
SIAT_2-GLOW STAT_2EBLINX EIJSE STAT_2 =GLOW ENDIF GOSUB PAUSER IF THEN
CASE 3 TIMlETIMl-1 IF TIM1 <1 THEN !!lldt=l GOSI'B PAUSER1
C]ASE 4 tlMl=t
l1+1
T1!,11 >20 THEN TIM1E20 i
CASE EIJSE
PBOJECT 6
Sre (Continuecl)
program-ihe touchpanel Flnal segment make finished to a
EIID SEIECT CASE EISE END SE'ECT segmenr of code uses lhe lwo r'time counters" ;The following the two LEDS on ;turn buttons It counts ;and off as specined by lhe fasrer/slower ; Elrnrng sequence LED on and off and lurns lhe related ; independentty IIHEN lF LCD I=ACTIVE THEN IF STAI-I=BLINR +1 AI,PEA=AJPI'A i IF lJrPEA>=! 0 THEN ; AIPEA=o i TOGCIA I,CDONE ENDIF ENDIF ENDIF IF LCD,2 EACTIVE THEIiI IF STAI-2 EBLINK THEDI BEIA=BEIIA +1 ; TXEN IF BEIA>=|!IMl BEIA=0 TOGSIE LCD_TWO ENDIF ENDIF ENDIF RETURN PAITSER! aOR x=1 TO 300 PAUSE 1 NEK![ X REIIURI| PAusERl FOR X=1 TO 50 PAUSE 1 NEXT X REIURN END ; pause to de bounce, long
to each
; pause , i ; i i
de-bounce,
short
EXERCISE
Modify the hardware and the Prcgram 201 so tho four columns are detectedon lines B4 to B7, and then use the intenupt capability of thesefour lines to imprcve the performanceof this program by mating its operationcrisper
SINGLESET POINTCONTROLLER WITH REMOTEINHIBITCAPABILITY
Project7
themometer we have madeand tum it into In this project, we take tbe dual temperature an adjustableprogrammablesingle-point controller that can control one property (not necessarilya tempemtule)in a processThe instrumentcanbe controlled remotely See 211 Figure Any controller needsthe followjng basicpropertiesto be both useiul and easyto use: I Have a set point that cafl be adjust dwith ease 2, Have a detector for the prope(y being measured 3 Have an output signal that is made available after I and 2 are compared 4 Have an input that can inhibit the operationof the controller from a rcmote location controller alreadyhastwo inputsOne of thesecaneasilybe con Our dual temperature We veited into a co rol point with the addition of a simple 50{0 Ohms potentiometer for also needto add a coupleof connections an output signal andwe needto have a way to inhibit the operationof the systemshouldwe requireit This canbe donewith a simple switch that canbe locatedremotely whercverwe want SinglePole SingleThrow (SPST) It can also be useful to have a switch that rcversestbe operationof the controller (in other words, that tums the outgoing signdl o, on an increasjngrather than decrcasing value, and vice versa)This is bought to your attentionso you are awareof this feature, on but it will not be undertaken thjs project It is simple enoughto add a switch to do so
THE COI{TROLSIAIEMEIIT
"If the siSnalat thc detectoris lessthd (or morethu) thc conlrol point, and if the inbibil signalis noi CLOSED,then providear output signalon the ortput line-"
II{HIBITCAPABIIITY SIIIGLESETPOIIIT COI{TROIIERW|rH NEMOTE
this A single set point controllerwith inhibit (When lf!lt$*q!!!i swilch selterandthe inhibil on boardis mounled a box,the lemoe|aiure can be mountedon lhe box side of lhey can be mountedat remote locations)
This is typical for most singlc-point controllers like a residential themostat, a small hot water heater controller, or any number of similar on/off conhollers More impor_ t^niy haviftB the "renote inhibit" capability allows this controller to be co trolled bJ anotheri strument(remoteh) these Let's createthe outp t on PORIAs andthe inhibit signal on PORTA3because arc the two lines we have available on the board as it is We have kept PORIA4 free this is the line ihat j s usedfor someof the counter inputs in the PIC 16F877A because (In ourcase,PORIA5 alsojusthappens be fiee) to to the hadware circuitry on the dual temperaturesensorarc shown in The additions Figre 272 In the software, we have to rcad the two analog sigllals, the set point and the conwe Then,based the calculation, on comparison trolledpoint, andrnakethe necessary needto turn the output sigral on if the inhibit signal is not present (Open in our case) placedbetween5 volts andground The setpoint adjustmentdeviceis a potentiometer We rcad the wr! r position of this potertiometer to get a reading between0 and 255 as we havedonemany times beforeThis readingcanbe convertedto the setpoint we need project the 0-255 wiper posinon was (Remember in the metronome that mathematically convertedto a number betwe n40 and 208) On fhe controllerinput, the variablewe are readingcanbe any signalthat can be is or convefieal into a resistance a voltageThe conversion to the equivalentof a 0to 5-volt signaland is read into the microcontrollerjustas we did with the temperHowever,it doesnot have to be a temperatureWhat we are really aturereadings
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