I'm just curious, for example, say i put 4 of these in a series circuit, how much resistance would I need?
I can put 4 leds in a series with my arduino and they'll work without any resistors while the arduino is plugged into the serial bus port
Now what you mean is something would provide that much voltage through the little DC adapter on the arduino board?
b/c the arduino would bring it down anyway no matter what i put in, right?
But then I put a bunch more there too all connected to the led before it and then the resistors were all connected together on the +- part of the breadboard.So all of the leds were going off of the digital pins that were for the 1st led and then all of the resistors were going off of the 1 ground. Is that bad? I mean it worked and nothing got warm or blew up.