Arduino can no longer communicate with computer through USB

[rafaelamelines]

I am using a Nano Every, and my project has been working fine for a while.

I recently tried attaching a 9V battery to the board using the VIN pin, which worked, but when I reconnected it to my computer after to change some code, I noticed the IDE said my board wasn't connected. This is the same USB cable I was using before, and I haven't had any problems with it.

The code stored on the board still works completely fine and the cable can supply power, but not data. RX and TX lights turn on as usual.

I have reset it several times.

I have tried connecting it to different USB ports on my computer.

The Port option in the Tools menu is greyed out.

[xfpd]

Verify the USB cable is for data and not just a power cable.
Assuming Windows...
Listen for the operating system "device inserted" chime.
Check Device Manager while you insert and remove the USB cable.

[rafaelamelines]

Definitely a data cable - I have used it before and it has worked fine.

I don't hear a chime and I can't find it in the device manager.

[jremington]

Disconnect the 9V battery and try again. The PP3 block batteries are for low power devices like smoke alarms, and are among the worst possible choices for powering Arduinos.

[xfpd]

@rafaelamelines

it has worked fine

Check the USB cable with another device.

[rafaelamelines]

The battery hasn't been connected since earlier when I was testing it. What kind of battery would you suggest instead?

[johnerrington]

You will find a lot of information and apps on this page to help you identify the issue

skillbank: Experiments and projects with an Arduino microcontroller

[cattledog]

You should use the tools shown in the skillbank reference in the @johnerrington post.

If you are convinced it is not the cable or the Windows USB installation on the computer, but the SAMD11 chip in the Nano Every is not seen by Windows it is a significant problem, and may require reprogramming that chip. However, if that chip is indeed fried it may not be able to be reprogrammed.

I have never done it, but you can get into the deep water of reprogramming the SamD11 chip with MUXTO firmware. However, with the windows USB not recognizing the chip, it's not clear to me if it will be recognized as a SAMD11 when you try to reprogram it.

Reset Nano Every via 1200 Baud touch

OK, well it looks like you have things fairly well worked out, but I'll provide the instructions anyway for the benefit of others who are interested in the subject: Install MuxTO boards platform Since Arduino has not provided Boards Manager installation support, it is necessary to do a manual installation of the boards platform for the "MuxTO" chip: Select File > Preferences from the Arduino IDE menus. Take note of the path shown in the "Sketchbook location" field. Click the Cancel button. R…

This process did not work for this fellow

Firmware for SAMD11D14A in Arduino Nano Every compilation

Yes, I really appreciate that great instruction! And yes after following that instruction, I can compile and get a bin file and load it to the SAMD11. But unfortunately, after load that bin to the SAMD11, I can not load the sketch to the ATMEGA4809 and always get the error of avrdude: jtagmkII_getsync(): sign-on command: status -1 I believe somewhere my setting is not correct, but I failed to figure out where. Just be reassuring, Have you successfully load the ATMEGA4809 sketch through the …

If I were in your situation, I'd be replacing the Nano Every with a new one and not going down the rabbit hole of repair.

[rafaelamelines]

Thank you for the advice.

Due to my self-imposed deadline for this project, I think buying a new Arduino will probably be the best solution, but maybe someday I'll try to reprogram the chip.