scanning RFID card twice , one for enter and one for exist

hi folks

i have RFID-RC522

Hello,

You need 2 scanners, placed in sequential.

arduino_new:
Hello,

You need 2 scanners, placed in sequential.

No not placed in sequence.

One placed either side of the door and both being connected to the Arduino. Make sure they are not mounted back to back as they need to be separated to read correctly.

They should be connected on the SPI bus each with a separate select line.