I have an Arduino UNO with a CNC shield. The Arduino is almost certainly a clone.
I installed GRBL with no issue and I have assembled a jig with CD-ROM motors. My first attempt to control this with UGS worked no problem.
I powered down to change the stepping with the jumpers and powered back up and was presented with a very hot smell after a few moments.
I removed the power quickly but now I can no longer program the UNO. It gets recognized in my devices but I can't send any code, even blink.
The jumpers were set like many examples I have seen on the web so I don't think this was the issue.
I am wondering if the way I powered it up was the issue? I am supplying the UNO with 12V 2A supply and I can't recall what order I plugged them in but I get the feeling it must have been supplying 12V to the Arduino.
I have now removed the shield and powering the unit solely from the USB and still can't communicate.
I have resigned to the fact this board is now toasted. Is it important which order you plug in the Arduino? USB first? Do you think it will be possible to recover this Arduino.