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 ... as a voltage divider *see the schematic). Do not power the circuit ...

I had a few problems with the PWM part mainly because the fan made a disturbing noise so I had to add a simple RC filter at the output of the PWM pin on the Arduino board. I used an LCD shield to ...

Instead, he drew up a simple schematic that used an Arduino Nano, an FM radio module based on the TEA5767, and an audio amplifier based on the LM386. A single button on the Arduino helps cycle ...