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 ... as a voltage divider ...

The image shown below indicates the basic wiring diagram of the current limiting resistors and driver transistors. Next is the Hookup diagram of the Arduino 4-Digit 7-segment LED Display ... The 10K ...

[Christian] wrote in to tell us about his third-generation Arduino MIDI sequencer (translated ... components seen above include the slider and potentiometer band, as well as the repository ...