2. Upload this code to Arduino Uno. 3. Open Serial Monitor. 4. Set Baud Rate to 9600. 5. Press Reset if required. 6. The detected I2C address will be displayed.
LiquidCrystal lcd(7, 6, 5, 4, 3, 2); // Khởi tạo đối tượng LCD vá»›i các chân: RS, E, D4, D5, D6, D7 lcd.print(rfid.uid.uidByte[i] < 0x10 ? " 0 ...
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