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The simplest inputis to readjustonepushbuttonanal simplest the outputis to tunljust oneLED ON We will do just rhatbur we will adda tiule complication LED is to The be programmedto be ON only while the blrtton is held down We will usebutton I atoD left) on the keyboardand rheLED connectedro PORTD0This emutares operarion the ofan ordinarymomentary conract switchjn anyreal world application

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On the LAB-XI, all of PORTBis dedicared the inrerface to with rhekevboard Lines B0lo BJ rre connecled thero$i andLhe lo line\ 84 ro B7 areconnecred rhecolumns ro of fhekeyboard Whenthe keyboard not beingused,the linesmay be usedfor other is

Let s start with the kind of shot we plan ahead for, which makes it a tad easier to get good results First, think about the evening news You ve seen the weather forecaster stand in front of a map of the United States and point to cold fronts a million times before, but have you ever thought about how that bit of TV magic happens Obviously, the forecaster isn t standing in front of a real map Instead, it s a blue screen a solid-colored rectangle The engineer uses a technique called chromakey to replace the rectangle with video from another source What happens is this: The engineer selects the color of the blue screen and identifies it as a key The second video source then overwrites anything in the scene that has the key-valued color You can create your own chromakey weather map effect yourself Here s how to try it

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1 Start with a piece of solid-colored board Hobby stores sell foam boards in a variety of sizes in a number of bright, primary colors, and I use them frequently for projects like this I have boards in several different colors so I can choose one that is differently colored than my subject that makes the technique easier to apply Tack the board on a wall or have your subject hold it, like this:

purposes,but keep in mind the intemal pull-up capability and the inline load limiting (80 to B3) Thesecan,of cou$e, easilybe madeto resistors the lower 4 bits/lines on remain outside our circuitry, so none of this is a problem for us In other words, the keyboard is connectedto PORTB such that the columns ol the keyboard matrix are connectedto the high nibble of a po and the rows ate connected is to the low nibbleThe whing schemalic shownin Figure57 To rcad a keyboard like this, the low nibble of PORTB is set to be outputs and the high nibbleis setto be inputs on the PIC 16F8 A,PORTB hasa specialproperty that allows its lines to be pulled by OPTION-REG7= 0 This prophigh (very weakly)with internalresislors setting the high bits (B5 to B7) but only thosebits that are actuerty of the PORT can alTectall ally programmedto be inputs with TRISB will be affected Next,thefour (thelow bits,83 to B0) aremadelow oneline at a time,while thehigh bits are polled to seeif any of them hasbeenpulled low If any of the switchesis down, when we oneof thelineswill be pulledlow Because know which low bit wasselected tlrc high bit becamelow, we can determinewhich key has be n pressedFor our purposes, this stage areinterested we only in swl, theupperleft switch,sowe cansimal plify the circuify to whal is shown in Figure 58 for one roq and then v/hat js shown in Figure59 forjust onekey has diagrams, canseethatif we makePORTBolowandPORTB4 been we In these polling is nec pulledhigh, PORIB4 will become low only if SWl is held downNo essaryat this stageOnce the conditions are set up, all we have to do is cfeate a loop that tums the PORTDo LED ON if the switch SWI is down and OFF for all other con513 ditionsThe codefor this is listedin Program readsswl andturnsLEDon PoRTD0 Beading swltch (Program a ffiwf{6kt!{ ONwhileit is down).