The Raspberry Pi is a cheap ($25) credit-card sized ARM-based computer running Linux, built and sold by the Raspberry Pi foundation

This project allows an electronics hobbyist to connect the Raspberry Pi to both an RFID card reader and electronic relays, and use the RFID reader to enable/disable physical machinery/doors by presenting or removing the RFID card.

Supported Hardware:

• Raspberry Pi - any revision should work.

• Stronglink SL030 RFID Reader

• Ciseco Relay Board (Note that you can replace this with a home-built circuit if you wish)

Other i2c RFID readers could be supported, but would require additional coding.

This code uses the following technologies:

• Python 3
• The i2c hardware electronics protocol
• The 'Quick2Wire' Python i2c library
• The 'Quick2Wire' Python General Purpose I/O (GPIO) library

You may need the i2c Raspberry Pi kernel patch See the "SETUP" file for more info about this.

This system was specifically built to be used in a minimal-security environment (a shared communal space). It was also specifically designed so as to allow the use of existing London Underground 'Oyster Cards' so as to avoid the purchase of new RFID cards by the user.

Further, it was also designed to operate without interfering with the normal operation of those cards. If this were not the case the contents of the cards could be overwritten by the user to ensure secure operation.

Given these (unusual) requirements, this code operates simply based on the unique 'ID' supplied by the card. It does NOT use the MiFare encryption facilities provided by the card. Since a determined attacker with electronics knowledge could be able to fake a card ID, I do not recommend you use this where security is important.

This code requires a Raspberry Pi to operate. It may work on other similar hardware supported by the Quick2Wire libraries with minor modification.

1. Install required programs as per 'SETUP.txt'

2. Edit rapc.conf and configure the pin assignments for the card reader and relay.

3. Start the rpac.py script by running start.sh, which configures the requisite environment variables for you:

   NOTE THAT THIS DOES NOT NORMALLY DISPLAY ANY OUTPUT

   ./start.sh

   In a separate session, run 'less rpac.log' to see what the system is doing