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For a 5v dc supply from 6V rechargable battery, you can use a Voltage regulator such a 7805, for the circuit diagram go here www.mycircuits9.com/2013/01/5V-DC-Power-supply-generator-circuit-projects.html
You can try a Fingerprint module sm630 or R303/R305 because, they have an inbuilt fingerprint scanning and serching section for more you can try www.mycircuits9.com/2013/03/fingerprint-based-security-system-using.html
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