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 ...

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ATmega328p micro-controller as per schematic or alternatively a Arduino uno/nano module. Resistors: 20 ohms , 220 ohms, 660 ohms, 10K , 500ohms X 7, 1K X 4 Transistors 4 X 2N2222 NPN One 4 digit seven ...

This repository contains the PlatformIO project for the firmware that goes on the Arduino Nano.