of the 4×7 LED display. Note that here the decimal point (dp) option is not used, but included in the sketch. D13 of the Arduino is reserved for the decimal point segment. The 10K potentiometer is ...

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 ...

Pulse Width Modulation is definitely the preferred method of dimming an LED with a microcontroller, but we were interested in hearing about a different method called Binary Code Modulation.