This is an easy tutorial showing how you can control the brightness of an LED or adjust the speed of a DC fan using Arduino Board, a small BC547 transistor and a potentiometer. In my example the whole ...

So, if you want to regulate LED brightness linearly to your eye ... If so, you can consider a Kalman Filter to stabilize the knob control/ potentiometer readings. Quick note: ATmega based Arduino ...

the brightness is different. Rather than control the voltage, it’s better to control the current passing through the LED directly. The easiest thing to do is add a potentiometer in series with ...

The cathodes were bent perpendicularly and forms columns of 16 LED’s. This way, if power is applied to one row and a single column is grounded, one LED will light up at the intersection.