You always need a current limiting device when using an LED and a resistor is the simplest one you can have. Anyone who tells you different is wrong.
which would be if one happened to be using a current limiting supply.
But I'm confused: do I really need a resistor if I limit the PWM output to 3.3v (as in my code) ?
So I think I don't even need to add a resistor!Sorry, I'm still newb to electronics
This on-off pattern can simulate voltages in between full on (5 Volts) and off (0 Volts) [...] The result is as if the signal is a steady voltage between 0 and 5v controlling the brightness of the LED.
Why do they always fight "the resistor"?Why resist?Is it "the expense"?
PWM 66% ---------> LEDsPWM 100% ---[R]---> LEDs
when the input voltage is the same as the forward voltage of the LED
Did you ever consider why it takes so long to earn an Engineering degree?
Why do they always fight "the resistor"?
let's say my multimeter show: 20 mA