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    How did you configure the serial port on the Python side? It is not done in the Python code itself. Commented Jun 28, 2023 at 12:29
  • @EdgarBonet Sorry I didn't get you by configuring the serial port. On the Python side, I have just mentioned the port number and thats it. About the hardware, its the same as mentioned in the question. Commented Jun 28, 2023 at 17:27
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    You cannot connect another USB-to-Serial converter on the same rx and tx pins. Serial ports cannot work in "parallel". Define a software serial using any other digital pins and connect your converter on those pins. The hardware rx and tx pins are already connected to the on-board "serial-to-USB" converter. Commented Jun 28, 2023 at 18:27
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    @Fahad I know and this is why when uploading the code, I need to remove the jumper wires rfom tx and rx pins. Once code is uploaded, I just press reset to start it again. Is that okay? Commented Jun 29, 2023 at 14:50
  • @SAndrew But you are still using the same pins for two serials! One is the onboard serial that you are watching on the Arduino IDE serial window (COM7) and one is in the python (COM6). That is a problem. Serials are not meant to be used as parallel buses. Commented Jun 30, 2023 at 1:32