Wiring Diagram check

[cropwell]

It's so you can power using an external source rather than USB and I suggest you do that. USB is unreliable and not to be trusted.

USB can't be trusted, but it isn't as bad as USA.

On a serious note, USB ports on a computer have a very low current sourcing capability.

[eurikain]

USB can't be trusted, but it isn't as bad as USA.

Go to bed Rob, you're tired :D

On a serious note, USB ports on a computer have a very low current sourcing capability.

True, but you can still use the port if you power it with an external PSU :)

[cropwell]

True, but you can still use the port if you power it with an external PSU :)

I think with that board, if you put an ohmeter on the +5v pin of the USB socket, it shows it connects to the +5v screw terminal connector, so the USB way of supplying power to the board is provided for those who want the quick and dirty solution.

Cheers,
Rob