I like this product (http://www.ebay.com/itm/Waterproof-Security-Door-Black-EM-ID-Wiegand-26-34-RFID-Card-Reader-/170997734969?pt=LH_DefaultDomain_0&hash=item27d0425e39) and i need 10 of it for my business doors.
But i need know how much of it i can connect to my arduino uno and what card are compatible?
Can anyone help me with the RFID reader and arduino? I need connect 10 or many i can with the same arduino.
Pls. Help me :(
This project has three Weagand readers attached
And the technique can be extended for more.