I am playing with RFID module from Rayax.
I got it working . This modue does not have a library so I am communicating with it over serial sending hex codes.
I am receiving response. My problem is that I do not know which hex values are received are actually making the tag UID.
And that brings me to the question. How many bytes should the RFID tag id have.
On some youtube videos they show 4 but with confusing documantation of this module I can see that this may be 7 or even 8.
Please advice. The tags I am working with are ISO14443-A
A UID has 64 bits. Despite the name they are not unique.
There are 8 bits in a byte so it is 8 bytes.
Thanks . Thats what I thought. But Reyax initially send me the codes for 4 bytes only. And only weeks later they updated the codes for reading 8 bytes.
If you check youtube videos from people I subscribe and trust they often use just 4 bytes.
e.g
go to 11:26
Are all their programs wrong?
I don't get what you are saying, this looks right.
Although the way he wires the 5V signals from the Arduino into the 3V3 signal inputs of the readers is wrong and will eventually burn out the readers, so he is not so clever.
He has e.g
3a cb bd 49
Isn't this 4bytes 32bits?
And you said UID is 64bits
Yes so you have 8 bytes there each byte expressed as an ASCII character.
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