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 ...

MOSFETS to control the signal to the LED strip. 10K resistors as pullup resistors for the buttons. A step-down converter, most CCT strips are 12V, the microcontroller can't handle this, so you'll need ...