Hi im having trouble with something which i thought would be simple, but its doesn't seem to be.
i compiled the blinking test and is it communicating with my arduino. so i know it is working. however i wanted to switch the current LED with a brighter LED (product code - N20BY Blue LED), i read on some forums that i needed a resistor otherwise it will fuse out, so with that i put the new LED through a breadboard. so the current circuit is
connected through the breadboard via wires
GRD--> to LED --> to 1kohm resistor -->back to 13pin
but im having difficulty with making the Bright LED turn on
The led is either reversed or 1k is too much. It's got a forward voltage of 3.6V (link), so 1k limits the current to 1.4mA. The led is rated for 30mA max.
R = (supply voltage - forward voltage) / desired current
So I'd test for polarity and later switch to a different resistor to allow for some more current. A value of 100 should give about 14mA.
The current grows exponentially once you pass the on-voltage (link). So either you precisely hit the right spot on the VI curve, or you create SMOKE. LEDs need a current limiting "device", the simplest being a resistor.