This project uses an RFID module (RC522) to create an access control system with Arduino. The system checks RFID tags against a stored authorized UID and provides visual and audio feedback based on ...

LCD (I2C): LCD Pin Arduino Pin VCC 5V GND GND SDA A4 SCL A5. LEDs: LED Arduino Pin Red LED D3 Yellow LED D4 Green LED D5 (Place a 220Ω resistor between each LED and GND.) Piezo Buzzer (2-pin): Buzzer ...

Inside the cool laser-cut box is an Arduino Uno and a 9V battery, plus a current-limiting resistor and the all-important buzzer. ... to build a project based on your 1D LED pong, Arduino-style ...