http://www.instructables.com/id/Weather-proof-Bluetooth-capable-RFID-reader/
makes use of
http://www.sparkfun.com/commerce/product_info.php?products_id=8419
http://www.sparkfun.com/datasheets/Sensors/ID-12-Datasheet.pdf
Also found this on Ebay. A little too much to spend at $59, but it has some info on how they work.
Still thinking about building a fun project to detect who is in my office by reading their badges.
Datasheet at
http://www.rfidshop.com.hk/datasheet/T5567/HI-R-W26-W2%20Datasheet.pdf
HI-R-W26-W2
125Khz HID compatible RFID Reader
with wiegand 26 bit output Interface
Features (Datasheet download here)
Frequency : 125Khz
support protocol : HID compatible protocol
power : +9V to +12V DC
read card serial No only
wall mount version
embedded antenna
effective distance up to 3-5 cm
Less than 100ms decoding time
Low power dissipation with single power supply
Built-in LED and buzzer
output interface : wiegand 26 bit
(42x80x15) mm
Interface Description
Wire color | Wiegand |
Red | +9V To 12V DC |
Black | Ground |
Green | Data 0 |
White | Data 1 |
Drain | Shield Ground |
Brown | Red LED (active low) |
Orange | Green LED (active low) |
Yellow | Buzzer (active low) |
Blue | Hold |
Violet | Card Present |
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