help required !!!!!!!1
i have to make a metal detector robot which has to detect an iron or any metal from 10 cm distance and indicate by an LED. i have found a circuit from net but this works for only a small distance as <1cm. can anybody help me out with the idea or circuit or source.............................

 

Try this website I am sure it would have something that you might like.

http://www.commlinx.com.au/schematics.htm

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Robotics is heaven in my book.