Raspberry PI RGB LED Control Code

RGB LEDs contain a Red, Green and Blue LED. You can mix any color by using the correct scale of the 3 basic colors. If you grow brightness and keep scale at the same time, you can show the same color even brighter. The brightness of basic colors can be set from 0 to 255. Brightness in Ozeki can be adjusted in absolute numbers or as a percentage. An RGB LED is a perfect tool to show desired colors.

raspberrry pi with rgb led
Figure 1 - Raspberry PI with RGB Led

Required hardware

  • Raspberry PI
  • RGB Led
  • Resistors: (2) 100Ω, (1) 220Ω

Source code to install on controller

#!/usr/bin/python
import RPi.GPIO as GPIO   
GPIO.setmode(GPIO.BCM)  # choose BCM numbering scheme.  

  
GPIO.setup(17, GPIO.OUT)# set GPIO 17 as output for white led  
GPIO.setup(27, GPIO.OUT)# set GPIO 27 as output for red led  
GPIO.setup(22, GPIO.OUT)# set GPIO 22 as output for red led
  
hz = input('Please define the frequency in Herz(recommended:75): ')
reddc = input('Please define the red LED Duty Cycle: ')
greendc = input('Please define the green LED Duty Cycle: ')
bluedc = input('Please define the blue LED Duty Cycle: ')

red = GPIO.PWM(17, hz)    # create object red for PWM on port 17  
green = GPIO.PWM(27, hz)      # create object green for PWM on port 27   
blue = GPIO.PWM(22, hz)      # create object blue for PWM on port 22 

try:   
	while True:
    		red.start((reddc/2.55))   #start red led
		green.start((greendc/2.55)) #start green led
		blue.start((bluedc/2.55))  #start blue led
 
except KeyboardInterrupt:
    	red.stop()   #stop red led
        green.stop() #stop green led
        blue.stop()  #stop blue led
  
    	GPIO.cleanup()          # clean up GPIO on CTRL+C exit

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