optical mark recognition

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k2thedevil said:
can anybody tell me how to build an Optical mark recognition thing
black dot detection basically
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Your requirements are rather vague?, but you can detect black on a light background with a simple LED and phototransistor (or photodiode). Reflective opto-couplers are freely available, which include both in a single package, and could well do what you want?.
 
Your r right Nigel and thats primarily because I m new.
could u give me some links to sites offerring circuit designs for this problem
or if u know a circuit urself
i basically would like to detect a black dot on a white background
with minimal components and modest accuracy
 

Try searching for line following robots - they use the same technique to find and follow the line.
 
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