Cesar, I agree with the "good luck on the software" on a PIC. Just to orient and match a fingerprint requires a lot more horsepower than you will get in any PIC. Add to that the storage requirements for "valid" fingerprints and you are way beyond the capabilities of a PIC. You might consider instead using a card reader (usually RS-232 output which is easily doable on any PIC) or an RF ID tag reader (again easily interfaced to a PIC). A previous post today mentioned that Microchip makes RF ID tags and programmers. Other PIC'ers can probably provide web references to other ID tag makers or makers of card readers. Hope this helps, Adam pogge@SHORE.INTERCOM.NET on 02/11/99 08:02:35 PM Please respond to PICLIST@MITVMA.MIT.EDU To: PICLIST@MITVMA.MIT.EDU cc: (bcc: Adam Bryant/PEAK/MOORE) Subject: Re: Fingerprint "reader" www.digitalpersona.com i think they cost 100 dollars for a reader. good luck on the software though! especialy with a PIC!! Regards, Ryan >Hi, > >First, thanks for reading this. I need to make a "fingerprint reader" >for a security control (start a very expensive machine). but I don't >have idea how I can do this, I have some Laser Diodes from CD-ROM >unit, but I need information how can I read the fingerprint and >compare the data with a personnel database and turn on the machine (I >wish use the 16F84 for control) > >Really, please help, keep my job depent on that! > >Thanks is advance > >Sincerely > >Cesar E. H. White