Arduino Project 4 Color Mixing Lamp

Pulse Width Modulation (PWM)

• Rapidly turns output pin to high and low over fixed period of time
• Since pins can only output 5V, we use this, the human eye can’t see how fast the change is, so this can give the illusion of dimming lights
• 6 pins for this on arduino

Duty cycle: percentage of time pin is high

Phototransistor: component that generates current proportional to light absorbed