Hello @tobias-h glad to hear it works now. Thank you for reporting back. Have fun! Thanks Felix

@tobias-h said in UHF RFID Unit (JRD-4035) on Arduino Uno: E.g. what board to select in the board manager ? In the Arduino IDE select: Tools - Board - Arduino AVR Boards - Arduino Uno. May I suggest you first get more familiar with the Arduino IDE, your Arduino Uno board and some simpler sketch examples for the Arduino Uno? Then maybe do some experiments with the serial connection (which is needed to talk to the UHF RFID Unit)? Alternatively you can always get an M5Stack device for which the example has been written. Thanks Felix