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The hardwarc areconsidering we consists ofan LCD with an integralcontroller tharis incorporated the displayby the displaymanufacrurer our particular in In case, rhis is theHitachiHD44780UcontrollerDisplaysareavailable wirhoutthisor anyothercon tolleri but codrolling displayswithout a controller is way beyondthe scopeof this book For ourprojects, surcyou buy only thoseunitsthathavethis controllerbuiltin as a be paft of the display Most do Controllingthe displayconsists oftelling this controllerwhatwe wantir to do The instructions easyto learn and allow you to controleachand every pixel and all are thefunctions thatthedisplaycanperiorm,wiih relativeease Youdo nothaveto read or understand ratherextensive the 40+ pagedatasheet Hitachi providesfor this that controller, it is well wonh thc troublerodownload datasheer srudyit you but thc and do not rued to downloadthis file eithet but you shouldknow whereto iind it if you needit We will go over almosteverythingyou needto know to controlthe display asa part ofthis exercise exercises lhe endofthe chaprer The at will takeit to thenext levelIn the LCD display, imbedded the provides interface conFoller the betweerrheuser andthedisplay controller theHilachiHD44780U The is powedulcontroller This very gives you complete control over the LCD h allows you to address eachand every pixel on the display alsohasa builtin setof ASCII characters useby the user It for Our taskis to learnhow to usethiscontroller Dulwhatwe wantwhen\r'ewantwhere to we want,in the display The otherconmon controller is the EpsonSED seriesconfiollcr, whoseoperationand instruction is very similarto thatoI lhe HirachicontrollerWe will rol consider set the EPSONconlrollerin thisbook Ifyou do decide buy a displaywiih ihis controller to ro savea few bucks,you should ableto useir afteronly a smallamounr srudy be of You will find that almost all the smaller liquid crystal displayson the market are controlled by the Hitachicontrollermentioncd earlier This means that onceyou learnto controlonedisplay, you cancontrolmostof themwjrh rhecodeyou create a mafter As of fact,we will write the codein a way thai will be universal its application that in in we will definevariables like the numberof character spaces the display and the in numberof linesin the displayas part ofthe programsetup(It is alsousefulandusu ally much easier usethe DEFINES to created the PBPcompilerto controlrhe djs by playWe will lern how 1odo thisin a laterexercise) The addresses the localmemorylocations of (meaning onesin theLCD) usedby the theLCD havealready beenfixed,ashastheinslruclion we useto write to theLCD set so we do not haveto create any ofthis rathersophisticated code.

A second source of light is just the ticket to eliminate shadows, reduce contrast, and even out the lighting in your pictures Sometimes you can do that with fill flash, and sometimes a small reflector will do the job A reflector is often better than a flash, because the light from a reflector is softer, and that typically makes better pictures In other words, it s always better to use natural light and that includes reflecting it than to use an electronic flash There are two ways to get into reflectors: the cheap way and the expensive way Believe it or not, you don t need an expensive reflector from your local photo shop in order to move light around you can have a lot of success using a glossy white sheet of poster board Purchase a sheet of poster board from your local art supply store for a dollar or two to try it out The problem with poster board, of course, is that it is often difficult to carry around For a more compact reflector solution, pick up a photo reflector at your local camera store Personally, I really like PhotoFlex Litediscs These clever little reflectors fold up so small that you can almost put them in your pocket Take them out of the bag, however, and they pop open to a variety of handy sizes I use a Litedisc that measures about 24 inches in diameter (see Figure 4-5), and I find that s a great size for most of the things that I want to photograph When you re ready to take a picture with your reflector, you ll probably need some help It s fiendishly difficult to hold a reflector and take a picture at the same time So instead of trying some feat of photographic gymnastics, ask an assistant to hold the reflector such that light reflects from the sky onto your subject Try to hold the reflector to minimize shadows or illuminate the dark side of your subject.

which is abolrt40 pageslong' bui you do needto You alonoi need the full datasheet particular display know the basic command set that controls the data tra$fer 1oyour ol you provided theorganization buy theLCD from andconsists two by Thi s is usually specral only to thedalasheet if you want1ocreale 1o You will need refer or threepages control t,*u"t"',_o if yoo *nnt to display bargraphsand the like on tbe display The butyou don'tneedtobe famil provides very comprehensive, is the Hitachicontroller in with it to usea display effectively Everything you needto know willbe covered iar you can abou!conthis exercise,but that shouldnot keepyou from learning asmuch as trolling the displays

FIGURE 4-5