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Can you help this problem with my Arduino RFID system?

Hi,

I have got an Arduino RFID system going with a Rfid_RDM630 card reader. This has worked for me for some time, but suddenly I am getting a lot of this "ÿÿÿÿ" in the serial monitor, but I'm also getting all the stuff I should be getting.

I have attached a screenshot to show you.

I have also attached the code, and have been following the instructions of this website. I have followed them to the word, any ideas why it isn't working?

I know that the RDM630 Unit is working as whenever I put a tag up to it the red LED attached lights up.

Thanks,
Ari

Picture of Can you help this problem with my Arduino RFID system?
Noise. You've develped a bad ground somewhere possibly, or your supply has drooped a little bit.
anonymouse197 (author)  steveastrouk5 years ago
Right, thank you - so the problem is with my Arduino board itself? I am running it from a protoshield, so if I try it straight into the board and switch some grounds about that will sort it out?
Thanks Steve!