13/9/2018
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Introduction 

An RGB LED has 4 pins, one for each color (Red, Green, Blue) and a common cathode. It has three different color-emitting diodes that can be combined to create all sorts of color! Any color is possible depending on how bright each diode is.

In this tutorial you will learn how to use an RGB LED with Raspberry Pi and create unique color combinations.

Let's get started!

What you will need - Hardware

The Circuit

The connections are pretty easy, see the image above with breadboard circuit schematic.

Python code

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#libraries
import RPi.GPIO as GPIO
from time import sleep
#disable warnings (optional)
GPIO.setwarnings(False)
#Select GPIO Mode
GPIO.setmode(GPIO.BCM)
#set red,green and blue pins
redPin = 12
greenPin = 19
bluePin = 13
#set pins as outputs
GPIO.setup(redPin,GPIO.OUT)
GPIO.setup(greenPin,GPIO.OUT)
GPIO.setup(bluePin,GPIO.OUT)

def turnOff():
    GPIO.output(redPin,GPIO.HIGH)
    GPIO.output(greenPin,GPIO.HIGH)
    GPIO.output(bluePin,GPIO.HIGH)
    
def white():
    GPIO.output(redPin,GPIO.LOW)
    GPIO.output(greenPin,GPIO.LOW)
    GPIO.output(bluePin,GPIO.LOW)
    
def red():
    GPIO.output(redPin,GPIO.LOW)
    GPIO.output(greenPin,GPIO.HIGH)
    GPIO.output(bluePin,GPIO.HIGH)

def green():
    GPIO.output(redPin,GPIO.HIGH)
    GPIO.output(greenPin,GPIO.LOW)
    GPIO.output(bluePin,GPIO.HIGH)
    
def blue():
    GPIO.output(redPin,GPIO.HIGH)
    GPIO.output(greenPin,GPIO.HIGH)
    GPIO.output(bluePin,GPIO.LOW)
    
def yellow():
    GPIO.output(redPin,GPIO.LOW)
    GPIO.output(greenPin,GPIO.LOW)
    GPIO.output(bluePin,GPIO.HIGH)
    
def purple():
    GPIO.output(redPin,GPIO.LOW)
    GPIO.output(greenPin,GPIO.HIGH)
    GPIO.output(bluePin,GPIO.LOW)
    
def lightBlue():
    GPIO.output(redPin,GPIO.HIGH)
    GPIO.output(greenPin,GPIO.LOW)
    GPIO.output(bluePin,GPIO.LOW)
    
while True:
    turnOff()
    sleep(1) #1second
    white()
    sleep(1)
    red()
    sleep(1)
    green()
    sleep(1)
    blue()
    sleep(1)
    yellow()
    sleep(1)
    purple()
    sleep(1)
    lightBlue()
    sleep(1)
Download the code from here and open it with Thonny Python IDE  or run it from terminal.
rgbledtutorial.zip
File Size: 0 kb
File Type: zip
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Well Done

You have successfully completed one more Raspberry Pi "How to" tutorial and you learned how to use RGB LED.
I hope you liked this, let me know in the comments.

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