Chapter 5 RGBLED
In this chapter, we will learn how to control a RGBLED.
RGB LED has integrated 3 LEDs that can respectively emit red, green and blue light. And it has 4 pins. The
long pin (1) is the common port, that is, 3 LED 's positive or negative port. The RGB LED with common positive
port and its symbol are shown below. We can make RGB LED emit various colors of light by controlling these
3 LEDs to emit light with different brightness,
Red, green, and blue light are called 3 primary colors. When you combine these three primary-color light with
different brightness, it can produce almost all kinds of visible lights. Computer screens, single pixel of cell
phone screen, neon, and etc. are working under this principle.
RGB
If we use three 8 bit PWM to control the RGBLED, in theory, we can create 2
8
*2
8
*2
8
=16777216 (16 million)
color through different combinations.
Next, we will use RGBLED to make a colorful LED.
Project 5.1 Colorful LED
In this project, we will make a colorful LED. And we can control RGBLED to switch different colors automatically.
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