Hi guys,
the other day I bought a parallax 28440 rfid reader. I wanted to make a device that will unlock my door when I use an HID proxkey II which I have on my keychain for other reasons. I made a poor assumption that the 28440 would be able to read it, as it works on the same frequency (125khz). The way I understand it, "normal" rfids (i think it's the em4100's) work like this:
header(111111111)
10x 4bit data(w/ parity at the end of those 4 bits(e.g.10100))
4x column parity
footer(0)
all-in-all this is 64 bits of data being transmitted in order to send a 10 digit number. Now my questions:
1.can I communicate with the hid tag with a 28440? (can't hurt to ask)
2.what do those HID tags send that's so different?
seb