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HAL900 is an electronic access control system developed for the OSAA hackerspace in Aarhus, Denmark.

There are two major parts of the system:

• The DoorController which is a piece of hardware that can interface with the door hardware, like RFID readers, keypads, motors, solenoids and sensors.
• The WebApplication, commonly known as HAL900, which allows members to create memberships, choose subscription level and checks their account balance.

I get my PCBs done at ITead, so I've found some weird limitations that need workarounds, see: Quirks-of-PCB-manufacturing-at-ITead