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    Does your Operating System recognize the Serial Port when you connect them? Have you tried uploading a sketch? Is there a reason to suspect they do not work? Some boards (like your Uno maybe) have a "blink" sketch installed by the manufacturer, others do not. Commented Jan 15, 2021 at 6:57
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    in device manager in my computer nothing changes when i connect the Arduino. Yes I tried uploading files and the "port option" is gray. no reason to suspect it's working. Commented Jan 15, 2021 at 7:02
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    If the LED 13 is blinking, that's generally a good sign. I'd check the connection and try a different cable. On Windows, you might need to install the Arduino IDE first, because that includes the serial port driver for some of the boards. Commented Jan 15, 2021 at 8:45
  • the blinking is like in every one and half seconds. the power and the led 13 lights are both red. on the device manager of my computer, communication port (com11) appear with warning sign. but in the Arduino IDE the port is still gray . Commented Jan 15, 2021 at 10:36
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    See also: arduino.stackexchange.com/questions/153/… Commented Jan 19, 2021 at 13:22

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