Revision as of 15:37, 5 June 2013

Overview

• RaspberryPi
  • Running Rasbpian
    • ssh raspberrypi.local

Setup

Steps Taken

1. Installed Raspbian on a 16GB SD memory card
2. Followed this guide to get I2C available
   • Used this article to determine that I had a 256MB Model B RaspberryPi. This is important, because when checking i2cdetect I have to use "-y 0" instead of the "-y 1".
3. This article is good too, it mentions to add the pi user to the i2c group so you don't have to run sudo all the time.
   • http://www.skpang.co.uk/blog/archives/575
   • sudo adduser pi i2c

Troubleshooting

• Ran into this error when running DannyO's (hubcitylabs) poll.py script:

quick2wire/i2c.py", line 72, in transaction

   ioctl(self.fd, I2C_RDWR, addressof(ioctl_arg))

• • Reason for issue: https://groups.google.com/forum/#!msg/quick2wire-users/BQ6mZRWaxgo/VFB6LUXuabMJ
• Problem Description: hubcitylab's poll.py script works on Rev1 RasbPi, doesn't work on Rev2
  • Solution: py532.i2c.py is hard coded to use "0" as the i2c_channel. This needs to be updated to "1" for Rev2 boards, or better yet, have it check which bus is in place and use the correct I2C bus location via detection.
  • Better Solution: the libraries downloaded with the git clone of the hikaru-gatekeeper are not the latest. make sure to download the latest libraries (quick2wire, py532, possibly others) independently to get code that will work on Rev2 raspberry pi boards

Resources

• http://hubcitylabs.org/nfc-on-raspberrypi-with-pn532-py532lib-and-i2c/
• http://www.ebay.de/itm/Cooqrobot-PN532-NFC-RFID-Reader-Writer-Module-starter-kits-with-tags-For-Arduino-/161010274918?pt=Wissenschaftliche_Ger%C3%A4te&hash=item257cf5d266
• http://www.hobbytronics.co.uk/raspberry-pi-raspbian-distro
• this article goes over how to use the internal pullup\pulldown resistors on the pi: https://github.com/quick2wire/quick2wire-gpio-admin/blob/master/README.md

Python Approach

• usbScan.py
  • Script will continuously scan for new USB devices, and call ldap Check. If ldap check successful, call DoorUnlock.
• nfcScan.py
  • same as usbScan.py, except for NFC (and RFID)
• ldapCheck.py
  • Take in value, see if it's in the LDAP
• DoorUnlock.py
  • Throw pins high and low on the GPIO to trigger relays that will be tied to a powerbolt1000.
  • Monitor pins wired to reed switches to ensure door is closed before re-locking.
  • Pin Assignments
    • Relay for Door Unlock (IN1 on Keyes Relay Board): #23 on GPIO
    • Relay for Door Lock (IN2 on Keyes Relay Board): #24 on GPIO
• ScanReedSwitch
  • Pin Assignments: #25 on GPIO
• Willie IRC Bot Framework
  1. install from github, tarball may not be latest
     • Install Dependencies: sudo apt-get install python-lxml python-mysqldb python-tweepy; sudo pip install pytz praw
  2. run sudo ./setup install to install modules

Perl Approach

• Would have to write an PN532 driver in perl
• Alternatively have perl call python scripts, python already has a PN532 driver written
• Write a new ackis module for NFC monitoring