What resistors should i use for RGB LED to power it from Pro Mini 328p 5V? I used a 200R for red and 150R for green and blue. The idea is to power it through PWM digital pins on Pro Mini. With these resistors lights are ok, maybe green is stronger then others. Should i use some resistors with bigger value?
Max. Forward Current 20MA
:o
Should i use some resistors with bigger value?
Yes you can. If the green overwhelms then make that resistor higher.
According to datasheet it seems that red and green has the same forward voltage. That means they need the same resistor. I think that is the reason why the green is stronger. Gotta change the resistor from 150R to 200R.
"I think that is the reason why the green is stronger."
The human eye is most sensitive to green, we see it best of all.
There's no law, no rule of thumb, that LEDs must be run at their limits (20mA or bust!) either.
who_took_my_nick:
it seems that red and green has the same forward voltage
No, you mis-read that. Green and blue have same forward voltage.
The most important thing, for most people, is that the led looks white when all r, g & b are fully on. If it's way off, it's easy to see that. But if looks reasonably white, you may want to compare it with an ordinary cool-white led, side-by-side.