Arduino security check system based on RFID and RS485 protocol
$2 for 10 PCBs (Any Color): https://jlcpcb.com
Full DIY Guide:
https://www.ardumotive.com/arduino-se...
This is a security check system based on Arduino UNO - with out custom PCB, RFID reader for card identification and RS485 serial protocol for a long distance data bus cable!