I have been experimenting with this library to monitor battery voltage: VCC Supply Monitor
To test this with a battery, I need to be connected to my PC via USB so I can see the Serial Monitor... but of course, that also feeds 5volts to my board, bypassing the battery.
Is there a way to view the serial monitor without sending 5volts to the board, allowing my attached battery to run the board?
I found this: FTDI - USB cable Could I simply use it and cut the 5volt supply wire?
Any other/better ideas?