The 4x4 Matrix Keypad Processor Board Prototype - Arduino Compatible + MORE!
There are two programmable codes that are saved in EEPROM memory. These codes can be changed at any time with relative ease. The Unlock code instructs a servo motor to move clockwise 45 degrees. The Panic code sets off a siren. For a short duration, you cannot turn the siren off. After the LED stops blinking, you can press the "1" button to shut the alarm off. You can also disconnect the siren and use the on board relay to control other devices with the panic code. There are four Arduino compatible outputs (Tamper/Timeout/Unlock/Panic). It is easily interfaced with any 5v compatible platform.
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http://www.engineeringshock.com/
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http://electroniclessons.com/
The Version#2 board will have most of the functions of the version#1 board, but on top of that, it will talk to you. There is also a battery backup option on the version#2 boards.
These are just prototypes, but I was considering putting these up on kickstarter in about a month to see if there was any interest.