![]() ![]() If that all sounds a bit confusing, there's a neat video demonstrating the concept of the system and showing the unit in action. The PC then compares this unique serial number to those stored in a flat-file database – if it matches, an unlock instruction is sent to a USB-connected microcontroller, which triggers a servo to withdraw the bolt and allow entry. ![]() Every USB object has one, and – in theory, at least – it's unique to that individual device and is never duplicated, even amongst devices of the same model. The way the system works is for a host PC to read the unique serial number of a given USB device. Basically, you can unlock your door with a mouse, a keyboard, an MP3 player – anything with a USB interface. ![]() Where it gets clever is that the system will work with any USB device – similar systems rely on storing a 'key file' on a USB-presented mass storage device. Hack a Day are currently showing off the work of the Makers Local 256, who have built a mechanical deadbolt system that relies on a certain USB device being inserted before the lock is released. If you're looking for a clever way of keeping your kid sister out of your room, how about a deadbolt that unlocks when you insert a specific USB key? ![]()
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