so the brightness is affected not only by the pwm but by the current as well?if i use the same resistor on every leds will the relative brightness from the pwm be reliable?what are the units in the V=IC?is it voltage=mA*Ohm?the current doesnt "go anywhere" right? like it doesnt shrink after passing an led?if i connect 15 leds in parallel to one pin, will the amperage be enough to power them all?thanks for the awesome comments!
sooo.... 200ohms should work with 3.3V for about the maximum brightness?to achive about 6mA i need to use a 600ohm resistor?
"No, transformers only work on AC."Actually, there's no problem running an LED on AC, as long as you have an adequate current limiting resistor, and place a blocking diode in series with the LED to stop the reverse current flow. Of course, the LED is only lit half the time. I have a diode on a 110 v. AC mains line that's been running fine for years.