raschemmel:
Your schematic looks fine but FYI, it is MUCH easier to just pick up a pen and pad and draw a schematic any way you want than to use some funky software and wind up with ground symbols upside etc. Hand drawn schematics are more effective and faster for anything but complicated circuits. Just take a photo of the schematic you draw. You'll find it much more convenient.About your schematic, you did neglect to mention something , right ? (like the schematic represents ONE of many similar circuits you have connected )
Yes. There are 8 such circuits, each one connected to different arduino port. all get the external power from the same power supply.
Do you see a reason why i can turn on all of them at the same time?