hello friends,

i need help on making a sensitve metal detecor base on 8051 , it should be sensitive/stable working , which method , pi/ib/bfo will be suitable for this , for example to detect a paper pin , feroo/nonferoo tiny metals etc, pls help me ,if u hv any idea or web adress , i hv searched but didnt found based on 8051
i need also digital filteration code for deviation +/- %5 a value in timer registers ,pls assembly language only

i will be thankful for ur kind help

regards