Measuring resistance

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hello all,

this continuation of project started in interfacing area (http://arduino.cc/forum/index.php/topic,101231.0.html).  i moving more electronics side figure best move out of area.

short description is, got old dvd robot free.  the board in toast, after ripping board out put arduino inside of it.  i have stepper motor... well.. stepping fine, , trying figure out sensors, appear optical switches.

this sensor wireing looks like, think.  its little tricky tracing surface mounted board.


from can tell, when breaks lightpath, optical switch opens.  when closed getting resistance of around 5.6k.

now need arduino detect this, brain farting , can't seem figure out how this.  if can give me guidance appreciate it.

thanks


edit:  d1 doesn't right me, , hard tell going way board is, theirs chance component isn't right.

after taking nap, figure out, had go basics , that.


Arduino Forum > Using Arduino > General Electronics > Measuring resistance


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