Potentiometer — LED wave

What do we want to do?

Change brightness within each quarter of the pot’s range.

Parts

• Arduino Uno + USB cable, breadboard, and jumper wires.
• Potentiometer
• 4 LEDs connected to PWM-capable pins
• 4 × 330Ω resistors

What to expect

Each LED fades up and down as the knob passes through its quarter.