chefslot:
Thank you, I will have a look at "strcmp ()", after quickly looking it might be best to make a char from the buffer rather then string?
I was wanting a certain card on a certain reader to do a action, but first a simple serial print to monitor saying what reader and uid and then access granted or not was the first step. I think I need to recheck that!!
always use cstring (char array with null-'\0' terminated) because String uses dynamic memory and it is harmful to arduino