Powering Arduino

Development Tools IDE 1.x
1

Hi, I have Arduino UNO R3 and MEGA 2560 R3. Usually I supply power to the board using a usb port of my laptop computer when I program the board. If I want my system to be autonomous, I have to use a battery source to supply power to the board. Will I damage the Arduino board if I connect the board to the usb port of my computer and also to the battery source at the same time?

Am I right that after I have downloaded the program to the board, I can remove the power source from the board completely. When I connect the power source to the board and turn on the board again, the program will still be there and the board will execute the program?

2

No.

3

johnwasser:
No.

No to which question?

I won't damage the Arduino board if I connect the board to the usb port of my computer and also to the battery source at the same time

or

If I disconnect and then reconnect the power source to the board and turn on the board again, the program will still be there and the board will execute the program?

4

Sorry. "No." to the first question.

Yes, to the second. Your sketch is saved in FLASH and will start at the beginning when you power up or reset the board.

5

Thank you