This is my project of secure door lock wifi enabled, it gets the Uid of the tag see if it has on memory then if it is true it sends via wifi to another arduino on the network that then enables the lock, servo or whatever action riquired in order to open the doorlock, i still far from finnished and i do not printed yet i i´ved got no time yet to expend time on this project so like i see that is not so many material online for this small rc522 opensource boards i try to share what i have done till now, maybe it will help someone ;) . Any questions just send it and i will try to answer soonest possible!