I've plugged my ELEGOO Uno R3 into a USB port on my computer with a USB cable. However, neither Arduino IDE nor my computer can see the device. When the Uno is connected, it shows no connected devices. The problem is not the USB port or cable; both work with the Arduino Mega 2560 and the Adafruit Metro 328.
The Uno still receives power from the computer; the green LED is on when the Uno is connected. Why can't the computer see the Arduino?
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Has the Uno had any accidental damage such as short circuits, cross-connected power, or even physical damage?JRobert– JRobert2024年06月26日 14:36:10 +00:00Commented Jun 26, 2024 at 14:36
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how do you know that your computer cannot see the Arduino?jsotola– jsotola2024年06月26日 15:19:55 +00:00Commented Jun 26, 2024 at 15:19
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1check cable (no reaction in device manager) or driver is not installed (but it would be shown as unknown usb device or similar)KIIV– KIIV2024年06月26日 16:08:49 +00:00Commented Jun 26, 2024 at 16:08
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I have some steps you can take to check your Uno and the Atmega16U2 chip, especially since you have extra Arduinos you can use in the testing process.Nick Gammon– Nick Gammon ♦2024年06月27日 06:59:53 +00:00Commented Jun 27, 2024 at 6:59
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@JRobert As far as I know, the Uno isn't damaged, but that would explain why it isn't communicating. The power LED still turns on.elvishpotato– elvishpotato2024年06月27日 08:10:50 +00:00Commented Jun 27, 2024 at 8:10
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