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to be sure And the whole point of having your own darkroom is so that you can get better results than the corner store delivers, right No wonder my dad never got too far with his darkroom kit These days, digital photography gives you the same flexibility as a chemical darkroom that is, a working one Digital photography offers the ability to brighten or darken an image, crop it down to generate a better composition, and print enlargements in a variety of sizes, but without the chemicals, the steep learning curve, and dedicating a part of your house to nothing but photography How did we get here

Filst, we need to get a handle on the signalscoming into our insEumentsThis chapter cove$ the techniquesusedto collect andcondition ihe ilput signalsso they canbe connected!o the microcontroller Beforc we can do useful work, we needto detectand managethe signal wo areinterestedin In our particular case,there is the addedrequirementthat the signal either be an electrical signal or be such that it can easily be conve ed into an electrical signal Though a Bourdon tube prcssue gaugemight rcad the pressue just fine for most engineerirg applications,we needa pressuresensorthat providesus with an elecldcal signal we can feed into an electrical instrumgntWe are not so much concemedwith the magninrde of the signal as we are wifh knowing it is iII a range we can read, manipulate, ard bring into our microcontrollers A linear signal responseis most desirablo,but we can take care of the nonlinearity of a signal in oul controller with software if that becomesnecessary In the engircering laboratoryand amateurengineer'sworkshop,the electrical signals we encounterwill most likely be somewhgrebetween0 aDd 120 volts ac and between 0 and 24 volts dc No matter what the conditions extleme caution and care should be exercisedwhen dealing with any kind of electrical signal Electricity canbe lethal if not handled with care When you aie dealing with the higher cur nts and voltages, seek the help of an experienced electriciar if you feel the leastbit uncomfo(able wiih underpart of the task Be informed that certain work must meet the rcquiements taking that of the National Electrical Code in most judsdictions, so help from an experienced person(electrician) can saveyou a lot of time and headaches Let's take a look at the ac signah nrst, and ihen we will look at dc signals

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anything over 120volts) a High voltage I20 \,olts(we will not consider ! Low voltage 24 volts lessthdn a Electronic(computercircuitry signals) Lessthan24 volts,andusually or equalto 5 volts