Reddit reviews Arduino Mega Case Enclosure New Black Computer Box with Switch
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This is a no-nonsense protective case designed specifically for the Arduino Mega 2560 R3.The case is a two-piece injection-molded ABS enclosure that snaps together around the Arduino. Holds the Arduino firmly in placeIt provides tough protection for the Arduino while providing access to all Arduino connectors. It also includes an integrated power switch for the Arduino.Integrated on/off switchAccess to all Arduino Mega R3 connectors.
Hi,
The hardware side is straightforward, but the software side of the system you want is a tremendous amount of work and potentially bug prone. I'd recommend using an off the shelf solution if possible, given the edge cases for such an implementation result in either unauthorized access or legitimate access blocked.
To start, what you want is probably 13.56MHz RFID. It's close range and used for most card reader systems and keyfobs. The reading distance is generally determined by the power in the reader antenna. There is no power source in the RFID chip itself, so it activates as soon as any part of the the chip's mini antenna gets in range of the reader.
That said, you are intent on the DIY route, here is how I might build such a system:
1x Local network authentication server.
There are many moving parts on the software side. This could be months of work for a single person depending on the requirements and how much time they spent on it.
RFID Reader (per door)
This is what a Mifare looks like attached to an Arduino. The breadboard is only involved for testing so I didn't have to solder the mifare. Was still testing different configurations.
http://imgur.com/a/1eaQ3
Advice
Part wise the above is cheap, but implementation is really time consuming. It also does not address actually opening the doors. I'm assuming you have electronic locks. Factoring in time to build and test I would probably go with something like this (quick google search, sponsored result): http://www.maglocks.com/rf-m8500-mortise-rfid-card-hotel-lock-with-built-in-deadbolt-by-digi-electronics-for-209.html. Surely not the best on the market but if I found one in 30 seconds, I'm sure there's one out there specifically for your purposes.