user7572: I have an Arduino project that has 15 different output pins set.  Some are currently attached to devices and others are not.  Will testing my program cause a problem / damage if it sets pints to HIGH that do not have anything connected to them?

user1585: Nope, you should be just fine.
Having a pin set to any state while unplugged will not cause any problems with your microcontroller.

7572: <p>I have an Arduino project that has 15 different output pins set.  Some are currently attached to devices and others are not.  Will testing my program cause a problem / damage if it sets pints to HIGH that do not have anything connected to them?</p>
 1585: <p>Nope, you should be just fine.</p>

<p>Having a pin set to any state while unplugged will not cause any problems with your microcontroller.</p>
