Well, I finally finished documenting my latest creation:
This is the project folder, including a brief description. Photos of the complete device and a bit more instructions are on my site here: http://daqq.eu/index.php?show=pr...
This project is hereby released as opensource.
The Concealed codelock (CC for short) is a design of mine, which can be used in a similar fashion as a safe lock, such as that on the picture above.
The rotation sensor used here is just a simple 10k potentiometer. The concealability in this is that you can use a double potentiometer. One part of the potentiometer will be used for the lock and the other one for something else, such as a amplifier, or any other normal home apliance that has a potentiometer for something.