Plugging and unplugging the USB while using a external source at vin in?

Development Tools IDE 1.x
1

Will I do harm to my Arduino UNO if I connect to PC with USB cord while the board is being powered externally, thru VIN In with a 9v supply. I would rather ask than chance. Thanks for any help, dukie

2

No, it will not cause damage.

However, you will active the auto-reset, and reset the board,

3

Thanks for the info. I really appreciate it. I can use all the help I can get. :slight_smile: Thanks again, dukie