i’m new to electronics, some very basic questions …
i connected one led with 220 ohm resistor to the board, as shown in tutorials > analog i/o > fading
my question: is the resistor required to protect the board or to protect the led from damage?
second i connected a laser diode (4,5 volt, <1 mW, 630 - 680 nm) instead the led, it works, but the point it throws onto the wall is not very bright. what can i do, less resistence?
my third question: i can use a potentiometer as/ instead a resistor? but how to wire?
board (~ pin 9 ) > potentiometer left pin > potentiometer right or center pin > led
thanks a lot!