So I found out after a couple of hours debugging that the +5 and GND in this section arent connected in rows as I had expected so only the hole by the label is connected. Given I had already soldered the headers and connected the external components I just connected them together across the back. Everything then worked as expected but is this ok ? Are any of those holes actually connected to anything else ?
I want to start using the others as a handy way to split a signal (eg, for I2C). am I likely to suddenly find one thats connected to something ?
A pic, follow the finger....
As you can see I have connected across on the 5v and GND but are the others safe to use ?