Here is a vibration detection device, for less than 20 bucks. Can it help protect your bike and valuables?
The device is armed, then there is a 5 second delay before the alarm is activated. I have set the device to it's highest sensitivity level of the three settings, by pressing the "C" button, three times.
This is the result of skulking around the Internet and "borrowing" ideas off a lot of people. Not to mention, bidding on eBay for batteries and chargers, plus trolling the pawn shops in town for a bike.