need help in reading ds1990 ibutton with pic

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rohitlucky

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Sir,

need help in reading ds1990 ibutton with pic16f628 .i know 1 wire routins for ds1820.is it same for both.actually i want to make door lock with i button .please help me.
 

I made iButton door lock with 89c2051 in DIP works fine, just now making in SMD version.
 
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