The hardware design for the Open Access Control for Hacker Spaces is nearly done.
This system uses the Arduino Duemilanova board with Atmega 328, and provides:
-Shield compatible with Arduino
-DS1307 Real-time clock with battery backup
-(2) Wiegand26 reader inputs (optoisolated)
-(4) Alarm zone monitor ports using Analog0..3 (optoisolated)
-(4) Relay outputs, rated to 10A/220VAC
-Spare pins 10..13 to enable Ethernet shield use
-Built in 12V unregulated, 5V regulated, 12V regulated supplies for alarm sensors, door hardware
-Built in UPS (smart charger in next design)
-Separate fuse protection for everything
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