Review your Arduino code for any errors in command interpretation or LED control logic.Ensure the LED is properly connected to the correct pins on the Arduino. Double-check your wiring and connections.Issue: The LED connected to the Arduino doesn’t respond to the commands sent from the PC.If unsure, disconnect and reconnect the Arduino, and check the COM port list again. It should match the COM port assigned to the Arduino by Windows. Troubleshooting: Double-check the COM port selected in the Arduino IDE under the “Tools” menu. Incorrect COM Port Selection:Issue: Selecting the wrong COM port in the Arduino IDE.
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