How to control LED brightness????????

[Samckitt]

Here is what he told me:



Assuming you have a current-limiting resistor in series with your LED, then by varying the voltage across the circuit, you are varying the current through your LED AND the voltage across it. I can't tell you which of these factors changes the brightness, but it will change the brightness. The other common method is to pwm it.

So I asked what PWM meant:

Pulse Width Modulate. If you're driving it with a CPU, you turn it on and off really fast. Your eyes can't see the flashing, but the LED looks dimmer, the less percentage the LED is on. If you shake an LED clock radio, you can usually see the LEDs flicker.