Now there are ways to make this harder, one being develop your own USB stick that is 'smart' (aka a USB key dongle) or use a proprietary file system on the USB stick that will complicate (slightly) reading and copying of the information on it on the computer end. On that note of the lock system, since the USB stick is 'dumb' you will not have two way communication, meaning the key on the USB stick will be static and anyone that simply copies the USB stick will be able to open the door. Now using an Arduino cuts cost and development a lot as much of that is included for free but only if you choose to learn the Ardunio and use it.
You are going to need a fairly significant power supply to drive the servo, as deadbolts can be a little tought to turn, and even more so if you want to control it via 3g/text message (much more)Īn interesting thought I just had was if you were to have it set up so that you could plug in a flash drive, have it read the file and use that as the current "password" so to speak, and then have it look for that file when you come back, that way its set everytime you leave, and its "encrypted" essentially.ĭo you have any micro programing experience, and are you setup to program micros? If not it's not as simple as getting the parts, you will need to get an entire development platform up and running, learn to program and learn to design the hardware. I would start with that first before moving into encryptions, though having a specific file on a specific sized flash drive should be enough encryption. Then it will just be a matter of programming it to read and inspect a text file, and then turn a deadbolt with a motor/servo. On that note, you will need a microcontroller, that has the ability to read a USB stick (PIC or Arduino should be fine). Well to start unless you are using some SERIOUS encryption methods you wont need anything nearly as large as a 1GB, in fact you would probably be better with a smaller one since it will be easier to read by a microcontroller.
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