Plug the RFID module into the breadboard with enough space around it. Connect the VCC pin to the Arduino's 3.3V (not 5V), and GND to the ground rail. For the data connections, wire SDA to Pin 10, SCK ...

All configurable settings are stored in EEPROM and automatically recalled upon restart. The hardware comprises an Arduino Nano or compatible, a standard 16x2 LCD display (used in 4-bit mode) with ...