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Open Access is a security system that was born out of a project out of Fullerton, Calif.’s 23B Shop hackerspace. It keeps the doors of a building locked until a recognized RFID fob is applied to the reader.

Makezine_COTM_Relays-SeptemberOpen Access consists of a circuit board with an on-board Atmega328P microcontroller IC (the same that runs an Arduino Uno) which controls four relays which trigger the various locks in the facility. There are also RFID reader ports and a realtime clock chip with a coin cell keeping the time. The Atmega can store up to 200 users, or you can attach a Raspberry Pi to the front of the board; this adds additional capabilities including the ability to control your security system with Python scripts and vastly increases its storage abilities.

Open Access is open source and you can find the source files on the project’s Google Code repository. Conversely, if you just want want a system up and running, you can buy everything you need at the AccxProducts store.

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net


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Comments

  1. Kristoffer Ek says:

    Why two microprocessors? https://code.google.com/p/openlock/

  2. Darrick says:

    @Kristoffer, It says the Raspberry Pi is an option if you need more than 200 users and the ability to customize the system with Python scripts.

  3. Open Access is great. We use an earlier version of the board at Bloominglabs in Bloomington, IN, with my old Arduino Duemilanove. It’s been working like a charm for two years and we’ve added our own bits of code and things in as well.

    You can also communicate w/ it over the serial port w/ Python or whatever on another machine, which is what we did to expand it.

  4. Lord Loh says:

    I wish latching / bi-stable relays were cheaper. I loath sending ~50mA to 100mA just to keep a switch on or off.

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