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.
Pics
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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://github.com/NottingHack/instrumentation, the relevant part is GateKeeper.cpp
Schematic
Logic Flow
Quick Breakdown
- Arduino with Wiznet shield
- RFID reader
- Doorbell button (interrupt pin)
- magnetic release (MOSFET switch 12v)
- Magnetic contact
- Doorbell sounder (Relay) - activated either by attached doorbell button, or doorbell on outer door (connected to main LED Matrix display)
- Magnetic release status led's red/blue (TODO)
- Matrix keypad and HD44780 LCD controlled via I2C AtTiny2313
- MQTT
- MQTT scripts on holly push door opened & last man switch events to irc twitter and log
- Card numbers in 'Instrumentation' MySQL database on Holly
- Database managed by HMS
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