This is probably a rather simple question, but I'd like some advice from an Arduino expert.
I've been running 2 led strips, each drawing about .2 A, from a 12 volt battery and interfacing with Arduino through a ULN 2003. This is all working splendidly.
Thus far, the the board has been powered through the USB but I need to power the Arduino either through the same 12 v batteries (which provide 1.3 Ah) as the LEDS OR power the whole thing from a wall wart.
I understand that for both, I have to make sure the 12 volts is regulated, and that I can use the Vin pin to supply power to the lights.
It seems to me like either one of those options would work out ok, how can I be 100% sure I won't fry anything?