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In addition to both Arduino's documentation and schematic stating that running ?A USB and external power simultaneously is supported, there are hundreds, if not thousands, of commercial products using Arduino microcontrollers that optionally provide two sources of power to the Arduino.? Any RepRap based 3D printer (a vast majority of the kits and pre-built printers for hobbyist use) use an Arduino-based bored as the controller, if not an Arduino Mega and RAMPS board directly.? The Shapeoko CNC mill also does this.? If you think about it, everything from printers to external hard drives use an external power source when connected to USB. If you are concerned about a cheap Arduino clone damaging your computers USB port, plug it in to a powered hub.? Worst case, the USB hub will sacrifice itself. I've heard the anecdotes about things breaking. My anecdotes are that I've upgraded both my Raduinos 5 or 6 times while powered on, use my 3d printer with external and USB power all the time, and have built dozens of stand-alone Arduino projects that use the USB serial connection for debugging, all without ever blowing anything up. I'm hoping that we can get past this issue as a community.? Imagine CAT control of a BitX for digital modes!? There is already an FT817 library for controlling a radio from an Arduino, so it shouldn't be too terrible to make it work the other way, assuming there is enough memory, etc...? I plan to take a shot at this when life slows down, but at the rate it's going it could be a while :-) Anyway, thanks for reading if you made it this far. 73, KE0KKM On Jun 1, 2017 7:33 AM, "davemrtn" <davemrtn@...> wrote:
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