This is no doubt a slightly dumb question but despite a lot of googling I can't find quite what I'm after and I'm a little scared of frying my arduino...
I want to control 2 stepper motors from my arduino. My understanding (from looking at the circuit diagrams on Tom Igoe's site) is that I'll need an L293D driver per stepper motor. I've struggled to find any information on how to wire up multiple L293Ds.
Obviously I'll be connecting each one to different set of output pins on the arduino but power-wise, am I connecting them in parallel ( their Vcc1 pins in parallel to the +5V pin and their Vcc2 pins in parallel to the ext power pin)?
Also, this is probably a terribly naieve question but how much current can be grounded through the ardiuino ground pin and does it make a difference whether your power source is usb or an external DC supply?
Thanks for any help you can give and be nice if I've completely missed the point!