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  • 1
    also happens on Windows as well so RPI is not at fault ... maybe, but it does not exclude python problems Commented Jan 4, 2022 at 2:47
  • what error do you get on the RPi if you run LED blink sketch on the arduino? Commented Jan 4, 2022 at 2:52
  • 1
    Yes, still hangs Commented Jan 4, 2022 at 3:28
  • 1
    Does it help if you remove the Serial.println() from the Arduino code? Commented Jan 4, 2022 at 8:24
  • 3
    You are flooding the RPi/PC with "I was written in RPI" and don't read it. Does it work if you read ser regularly? Commented Jan 4, 2022 at 9:06