Arduino Forum

Topics => Device Hacking => Topic started by: Wupadrasta_Santosh on Aug 03, 2014, 12:17 pm

Title: DIY FSK RFID reader with arduino
Post by: Wupadrasta_Santosh on Aug 03, 2014, 12:17 pm
I want to know why toroidal inductor is being used in the RFID reader described in the site...
I feel that toroidal inductor wouldn't be much effective  in grasping the changes in electromagnetic field changes...
Title: Re: DIY FSK RFID reader with arduino
Post by: spycatcher2k on Aug 03, 2014, 12:59 pm
Errmmm - What site, a link would be nice, or a diagram.
Title: Re: DIY FSK RFID reader with arduino
Post by: omersiar on Aug 03, 2014, 03:34 pm
http://playground.arduino.cc/Main/DIYRFIDReader I know this one, but its real complicated for me.
Title: Re: DIY FSK RFID reader with arduino
Post by: robwlakes on Oct 24, 2014, 07:04 am
The coil is just an air wound coil (3.25 inches diameter).  I think a toroid implies that it has some sort of ferro-magnetic core or case (in which case I would agree) but the design has a coil that is big enough to function both as a transmitter of power and also as an antenna to pick up the generated disturbances of the transmitted signal, ie the data being transmitted.