I have recently purchased a MKR Zero board. Done a few sketches on it and then one morning it didn't want to connect to the computer at all. Not showing up in device manager at all. Not in ports or other devices and have also selected show hidden devices. It use to have a orange LED light up but now I only get a green LED. Tried multiple cables and multiple computers all get the same issue. Tried reinstalling everything and still nothing. Please any help would be appreciated.
The tricky thing about the boards with native USB functionality like your board is that the USB code that creates the CDC serial port is running on the same microcontroller as your sketch. This means your sketch code can break the USB code, or stop it from running.
Fortunately, there is an easy way to recover from this situation:
- Press and release the reset button on your board quickly twice. You should now see the LED on the board pulsing, which means the bootloader is running. The double press causes the bootloader to run indefinitely (until the board is reset, powered off, or an upload is done), which means you don't need to get the timing of the reset just right.
- Select the port of your board from the Tools > Port menu. The port number may be different when the bootloader is running so don't assume you already have the correct port selected.
- Start an upload in the Arduino IDE.
The upload should now finish successfully. After this, you should be able to go back to doing normal uploads without needing to press the reset button. If you still need to do the reset trick to do uploads after this, the problem may be caused by your code. You can verify this by uploading a simple sketch like File > Examples > 01.Basics > BareMinimum.
Hi pert,
Thanks for the reply. Unfortunately this didn't work. You are right with the double tap. Thats what I had to do at the beginning but not I have nothing. The LED does start blinking but still nothing on the PC side.
Does the LED blink, or does it fade in and out?
Fade in and out