Thank you all for doing all of this work. I'm working on a Mega 2560 and cannot get this to work at all. I tried many examples, including the ones on this page. If it makes any difference, I'm using the "Blue Eye Key Fob Tag" from Parallax that uses the EM-4100 tech.
According to Arduino's SofwareSerial example, (http://arduino.cc/en/Tutorial/SoftwareSerialExample
) "Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69"
So I naturally just changed the RX pin to any one of the above. I only want to read tags, not write them, so I suppose TX doesn't really matter, but I hook it up anyway. Still nothing.
Can anyone give me any pointers for a Mega 2560?