hello 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:
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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) thanks tom