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┐0Caolan80 $А       l444H4| И СrpX|ФPhp ┘Hardware dokumentation Vi har valgt at lave et addon modul til picdem2 boardet i stedet for at lave et design fra bunden, idet ingen af os har sцrlig meget styr pх hardware, vi har dog lavet et diagram, se bilag XX, over hvilke komponenter pх pic boardet vi bruger, sхledes at det vil vцre relativ nemt at lave et selvstцndigt board. Addon boardet kan deles op i to sectioner, en som beskytter pic'en mod overspцnding og en som simulerer io fra fyret. Diagrammer over disse to sectioner kan findes i bilag XX og XX. Grunden til at vi har sat en optokobler foran indgangene pх pic'en er for at sikre at beskytte pic'en Pх den analoge indgang er vi hoppet over hvor gцret er lavest, idet vi ikke kan forsvare det hardware der skal til for at fх lavet en galvanisk adskildelse mellem input fra fyret og indgangen pх pic'en. Skulle det laves korrekt, skulle den variable spцnding konverteres til en variabel str°m, som derefter k°res i gennem en lineцr optokobler. Pх den beskyttede side af optokobleren skulle den variable str°m dernцst konverteres tilbage til en variabel spцnding, der kunne aflцses med PIC'ens A/D converter. I den fцrdig udgave vil det dog vцre mere sandsynligt at den analoge vцrdi kom ind til pic styringen i form af en variabel str°m i omrхdet 4-20 mA. str°m = amps spцnding = volt addon del 1 = tilkoblet PIC, sikrer pic'en imod overspцnging mm addon del 2 = simulering af io fra fyr .Ь╘Є Ї Ў 0░■цфтр▐▄┌╪╓╘╥╠ддx & F ╞Д^ДД]ДД`ДдЁдx "░Б. ░┼A!░n"░n#Рn$Рn3P(20Root Entry         └F└ CompObj    jOle         1Table            [¤   ■                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           SummaryInformation(    Р╫WordDocument            t$DocumentSummaryInformation8            %t            ■