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 ... be used with an Arduino and I strongly ...

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 ...

You will need an Arduino board, a potentiometer (I have used a 50K one), as ... Then store this value inside the speed variable that is used in the delay() to control how much time to wait until the ...

You can salvage some nice motors out of optical drives but they can be tricky to control ... to protect the Arduino from excessive current. You can see six red LEDs above which are inline with ...