Arduino in one port and Processing out the other port

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hi,
i'm new in arduino , things electrical excuse lack of knowledge , ways express myself.
i have project controlling brightness of light through processing (reading csv file). goes out 1 port.
on other hand, , port, have arduino attached light sensor , sd card can record light receiving. recording light being manipulated through processing. hence both ports being used.
my problem turn processing sketch start manipulating light, sd card on arduino stops recording.
i have tried taking light recorder off laptop , plugged in through converter light readings erratic, spiking. left having plug them both in laptop.
is there way round this?
thanks

would show code or prefer fix telepathically?


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