is it possible to connect the mfrc522 to a esp8266?
My idea is to realize a RFID access control that will send user access information to a NODERED flow on a Raspberry PI. In this case the ESP8266 will get the card info from the RFID reader and use it as payload to be sent to Nodered server.
I think SPI is an option but I would like your help to start in the right direction.
Thanks