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Author Topic: Uno only semi works on two of four computers  (Read 575 times)
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Used to be that some laptops had weaker USB ports.  Might check the supply voltage to the board to make sure they are getting enough voltage?

I agree and that's what I thought too.  But then when connecting a external 9V battery to the Vin pin, should this not have fixed the problem?


Nope. A 9v battery probably supplies a lot less current than a USB port.

OTOH if you're outputting enough current on an I/O pin to cause problems then that pin isn't going to last very long.

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