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For use in [[Doorbot]]. An rfid reader could be made using an arduino, a simple circuit, and winding our own antenna: [http://arduino.cc/playground/Main/DIYRFIDReader DIYRFIDReader] (Appearently this doesn't work) The fobs we want to read are of the Proxkey IIII variant which operate at 125kHz: [http://www.nodaccess.com/media/content/files/proxkeyIII_ds_en.pdf proxkeyIII_ds_en.pdf] ==Bill Of Materials== '''Resistors:''' * <s>8K</s> (8k2 or 4k7+3k3) * <s>2 x 12K</s> * <s>2 x 100K</s> * <s>220K</s> * <s>1M</s> '''Capacitors:''' * <s>2 x 1nF</s> * <s>7nF</s> (6.8) * <s>15nF</s> * <s>2 x 100nF</s> '''Op-amps:''' * <s>2 x LM324N</s> (LM324NE3 sampled) '''Diodes:''' * <s>2 x 1N914</s> '''Coil:''' * 35 turns @ 3.25"D ==Further Reading== * [http://cq.cx/prox.pl cq.cx/prox.pl] [[Category:Arduino]]
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