Old-RFID access control

From BloomingLabs
Revision as of 21:50, 7 November 2010 by Dosman (Talk | contribs)

Jump to: navigation, search

Bloominglabs has built and will soon activate an RFID access control system. Our system is loosely based on Open Access Control designed by the 23B Shop hackerspace. We needed to get this operational as quickly as possible. Once we found their design we made our own minimized designed based on that. The goal was not a masterpiece of engineering, but something quick and dirty that would get the job done. We also wanted something that could operate completely standalone if necessary and still log access, so we added the SD card to our design.

Contents

Features

  • RFID access control of 2 doors in our building
  • Stand-alone logging capability (via the SD card)
  • USB connectivity for logging to IRC/Twitter/etc when the host PC is running
  • UPS battery backup for emergency access during power outages


Hardware

  • ATMega328 based on Arduino code from Open Access Control with our own modifications
  • Wiegand26 RFID readers
  • Generic electric door strikes
  • Uses shielded CAT5 for connectivity of RFID reader and electric strike operation


Software

We will post our code soon. Currently it is based on v 1.16 of Open Access Control for Arduino.


Completed Controller

Here you can see the ATMega328 which makes up an Arduino on a breadboard. Five volt regulator sits at the top in the middle. The headers just above the ATMega is for a SparkFun FTDI breakout for programming the Arduino and logging to a PC. The relays on the left side of the board enable the electric door strikes. On the right are RJ45 ports which allow the CAT5 to be used to connect the RFID reader and door strikes (one port for each door).

RFID board


Board is installed in the enclosure. You can see an Adafruit I2C real-time-clock hanging off to the left and an SD card reader board sitting on top of the relays.

RFID board


Enclosure sealed up with SD card reader sticking out through it's hole. The two buttons on top are manual override releases for the door strikes.

RFID controller enclosure - SD card reader


Enclosure showing power jack and RJ45 connectors for connecting external components.

RFID controller enclosure - power and RJ45 jacks
Personal tools