Well I knew it would happen, Thieves using arduinos to break into Hotel Rooms

You know it was going to happen, when it was posted in Late July at blackhat how easy it is to bypass most hotel card key locks, some thieves would build it.  It doesn’t even take much electronic knowledge, just go to radioshack and buy a handful of parts ($50), download the code, compile it, (pushbutton in the IDE) and program the arduino, plug in the proper connectors and go.

http://www.forbes.com/sites/andygreenberg/2012/11/26/security-flaw-in-common-keycard-locks-exploited-in-string-of-hotel-room-break-ins/