@brossingo It's unclear if you mean voltage supplied BY the device, or voltage supplied TO the device. If you're using USB, the voltage is obviously supplied by an external device (PC, power supply...) TO the device, and the device can't change that. If you want to use a different voltage, your probably want to use the battery connector instead, though it depends a lot on what actual voltage you can feed the device and a lot of other considerations. Could you give more details about what exactly you are trying to achieve?

Yes! Thank you!!

Have you tried using something other than pymakr? maybe screen or minicom. Also its worth checking if your user has permissions for the serial port. The procedure to do this varies by linux distro but on most you can add your user to the dialout group and when you reboot that user will have permissions to use serial ports sudo usermod -a -G dialout $USER

OP Here I also uninstalled atom and pymakr a couple of times. I also uninstalled pymakr a third time and installed using apm install and that did not work.

I got this to work on a different pc with windows 10, 32 bit installer of the the visual studio code (even though windows 10 install is a 64 bit install). 64 bit install of the visual studio code didnt work with the pymakr plugin for me.