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Dennis Dreyer

I am beginning to think that an instability with the COM3 port may be inherent with the Arduino UNO R3 that I purchased from Amazon (an Elegoo brand kit). A friend of mine also purchased the same kit to work with his grandson, and is experiencing the same problem with the COM3 port on his device–also using Win7 64bit operating system. He has been experimenting with other things such as simulating blinking red and blue leds, and speaker sounds to mimic police chases. Have you been using a Arduino Nano or some other Arduino device ? I am planning to purchase a Nano from Amazon and should be able to test it this coming weekend. I also will attempt to evaluate tomorrow whether a Win10 i7 laptop behaves better than what I have experienced with Win7