Gatekeeper

Gatekeeper is the first node of our Hackspace Instrumentation project to go live and is responsible for access control to the space through the front "Airlock" door.

Source Code

The firmware that runs on the arduino cane be found here
https://github.com/NottingHack/Gatekeeper
The code for the database and the process that run on Holly can be found here
https://code.google.com/p/nottinghack-instrumentation/

Schematic

Logic Flow

Quick Breakdown

• Nanode
• RFID reader
• Doorbell button (interrupt pin)
• magnetic release (MOSFET switch 12v)
• Magnetic contact
• Doorbell sounder (Relay)
• Magnetic release status led's red/blue
• Matrix keypad and HD44780 LCD controlled via I2C AtTiny2313
• MQTT
• MQTT scripts on holly push to irc twitter cacti and log
• Card numbers in 'Instrumentation' mySQL on Holly
• Web page to manage mqsl db, intranet only, htacess passwd

Notes

6 Core alarm cable run to airlock door

• magnetic contact on black and white core
• door magnetic release green and yellow cores
• last man switch on blue and red cores