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Comparing two LDR connected to PIC

 
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quium



Joined: 19 Jan 2007
Posts: 27

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Comparing two LDR connected to PIC
PostPosted: Sat Feb 24, 2007 8:40 am     Reply with quote
Hi
I have two LDR connected to two analog ports op PIC16F876 in the potential divider sort. I want to compare the two LDR values (I mean the voltage) and then give appropriate signal to drive the mtor. I am using CCS C compiler. Any suggesstion???????

Many Thanks
Quium
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Sat Feb 24, 2007 11:29 pm     Reply with quote
You should be away that the transfer characteristics between LDRs even in the same batch can vary significantly. You may need to perform some form of calibration on them if you want fine or medium level of granularity for the delta.
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