Hello. I have an Arduino Uno R3.
If I connect a 9V battery to Vin pin, can I still connect a USB cable to read serial data in Processing?
Since USB cable also acts a power supply when battery is not present, I'm worried if having 2 supply sources at the same time might damage the board.
Thanks.
Yes you can.
Since Vin/2 will be greater than 3.3V, the board will run from the 9V power.
Thank you!