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l Make a sensorto investigate the gravify chaDgesyour body exp riencesas you travel up and down in a commercial elevator How do the values vary between a hyalraulicelevator in a small building and a traction elevator in a tall building Were you surprisedby what you found (Investigate both drc magnitude and dudtion of the accelerations) 2 Investigatethe gravity changesexperiencedby a passenger a car Both sidoways in motion and forwad motion/accelerationshouldbe studied
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BUILDING SIMPLEEIGHTBUTTON A TOUCHPANEL
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TOUCH PA ELS Today,we seetouch panels usedeverywhereEvery restaurantand store you visit has a handful oftbem But how exacdy do they work WeIl, this chapterdescribesone way to skin thiscat If you design an instrument or confoller that needsa control panel in a hury, by iar the easiestway to make one is to do it with a touch panel They are flexible and inexpensiveand they go togetherfast They are easily reprcgrammedand most can be used with many applications just by changing the software Depending on your requirements,the panel may be able to employ the PIC usedby the instrumenrcontroller you are designing,or it can be designedto have its own dedicatedpIC In this project, we will build a touch panel to be placed over a plain piece of paper, with thefunctions written or the paper(seeFigure 20I ) This panelwill contpl the oper ation of two LEDSconnectedto the LAB-X I We will control the opemtionof the LEDS liom this panelThe following functions will be implemented(Make a mentalnote that the control of a coupleof small dc motors would be almostidentical to this application) I r I I Selectthe LED to addrcss Tum LED on and off Select steadyon or blinking for eachLED Blinl slo$erandbltnkfl]ter edch lor LED
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The principlesinvolved in creatinga touchinterfacefor anynumberof appticationsare the sameOnce you know how to createthe interfaceon the LAB Xl, you will be able to addthe interfaceto any surface Thoughusuallyplacedin front of a CRT,a touch interface is particularly well suitedto being placedin front of printed andpainted surfaces ro
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and pholo_ with lR emilters A smalltouchpanelframe ffiS transistorsin Dlace
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panelframe intothetouch soldered Thecomponents
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It replaceanynumberof pushbuttons canbe maderelatively weatherpoof easily andhas no mo\'rngpafis Of couse, the samepdnciplesalsoapply for touchpanelsplacedin liont that we can changewhat is displayedwith each have the advantage of CRTS, and CRTS touch
C PBO,TECT
Our goal is to qeate a two-position-by-four-positionintedacefor the LEDSThis will give us the equivalent of the eight buttons wo needfor the operationswe have ill mind we will usethe ilterJace to control two LEDSthat we will addto the LAB-X L As mentioned earlier we want to be able to tum eachone on and off and be able to contol the rare at which each of the l-EDs blinlc independently
HARDWARE I{EEDS
In order to createthis eight-button interface,we needsix infrared (IR) light beams,one for eachof the two rows and one eachfor the four columns Each IR light bean needs a an emitleranda sensorWe willalso need simpletramelo holdlhr l2 opro-eiecronic devicesin place abovethe piece of paper describingthe functions of the eight buttons Figure 202 shows the schemeusedby me in its initial phasewith the componentsin place and ready to be wired together Figure 203 showsthe next phasein the wiring
SOFTWARE I{EEDS
The function of the eight buttoff that the intedace will simulate will have to provide for $e following operalions the two T tDs: LED 1 LED 2 ON/OFF ON/OFF Steadyor blink Steadyor blink Blink faster Blink iaster Blinl( slower Blint slower
Simultaneously,we will display the conditions inside the LAB-XI on the LAB-Xl's LCD so we can actua]ly seewhat is going on
Detall whingior thetouchpanekloseup ol one wmXW purposes, (For side ourimmediale exposed isacleplable) wiring
PAiIEL EIGHTBUTTOII TOUCTI BUILDII{G SIIIIPLE A
of The operationof a touch inteface is very similar to the scanning a keyboard and, of course, exceptthat the wires and switchesare replacedby infrar d light beams the with a switch,we breaka light beamanddetect eflect instead makinga contact of on a phototransistorThe problem is that light beamsscailer aid can illuminate mole thanone detectot while the wires go 1oone button only making them easierto use This We to hastobe moredevice-specifio be successful needto turnon means scanning the it opposite (ignodngall and look al the one phototransistor one IR emitterat a time by this as we go along You will moreclearlyseewhat I mcan others) PORIA (two linet, PORTB(six lines),ard PORTC(six linet will be Port usage: to useal the projectLet's usePORTB(six lines)for connection the six phototran_ lor (six sistors, usePORTC'S linet to powerthe six infrafedLEDSoneat a timeWc and two LEDSThe wiring diagram will usethetwo lines(A2 andA3) on PORTAlbr th3 as for the touchscreen we will wire it is shownin Figure204
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