I have arduino pro mini, hc-06 bluetooth module, and mifair rc522 rfid reader. Bluetooth module connects to serial port, and rfid connects to sda, sck, mosi,miso, ground, reset, and 3.3v pins. I want to know if there might be a conflict between rfid reader and atmega serial port. The reader will be used for reading and wiring cards. Bluetooth is there for monitoring.