on my first arduino project i will make a simple pov (laser pov)
the first stage is to get a laser led(s) working from arduino out pins.
so i set up a breadboard with uln2003a darlington chip , and connected the board as shown in this link:
the laser led is working when powered directly from 5v out but not when used through pin 13.
also I should ask for directions about current limiting resistor , though it seems there is one inside already (this is a disassembled laser pointer)