In this lesson, you will learn how to use a RGB (Red Green Blue) LED with an Arduino. You will use the analogWrite function of Arduino to control the color of the LED. At first glance, RGB (Red, Green, Blue) LEDs look just like regular LEDs, however, inside the usual LED package, there are actually three LEDs, one red, one green and yes, one blue. By controlling the brightness of each of the individual LEDs you can mix pretty much any color you want.
We mix colors just like you would mix audio with a ‘mixing board’ or paint on a palette – by adjusting the brightness of each of the three LEDs. The hard way to do this would be to use different value resistors (or variable resistors) as we played with in lesson 2. That’s a lot of work! Fortunately for us, the Arduino has an analogWrite function that you can use with pins marked with a ~ to output a variable amount of power to the appropriate LEDs.
In this lesson, you will learn how to change the brightness of an LED by using different values of resistor.
We’re pleased to announce we are updating all our Arduino tutorials with a new series! Arduino Lessons by Simon Monk & Ladyada in the Adafruit Learning system (learn.adafruit.com)! Simon is one of the best educational writers in the world and we also stock his fantastic book(s) here in the Adafruit store! Check back each day for a NEW lesson!
First lesson, Arduino Lesson 1. Blink. In this lesson, you will learn how program your Arduino to make the Arduino’s built-in LED blink.