|Building Your Own Biometric Safe
|This is what you will see when you first open the fingerprint reader. You will
need to flip the circuit board over.
|The red arrows indicate the pin and pad that can be used to take the "proper
print signal" from. I used a very thin insulated wire and threaded it up and down
through a few of the holes surrounding the IC so if the wire was tugged during
reassembly the solder joint would not be strained.
|To convert my signal to pulse that would open the door of my safe required this
circuit. It is based around the CD40106B. The "6v" marks indicate that the
circuit is running off of the same 4 AA batteries that power the fingerprint unit.
The "12v" marks indicate a separate battery pack that is used to power the latch
|Here is the final product. I am being a bit vague on the exact details of this
particular build on purpose to protect the security of the design but with the
schematics and descriptions I have given anyone should be able to recreate
it. When the proper print is swiped the door opens and reveals any
valuables you want to hide inside!
If you want to read all the details instead of just this crappy write-up, check
out the original thread. Fingerprint Pistol Safe
|I owe all credit for building the circuit to "eblc1388" on the allaboutcircuits.com forum!