Editing RGB LED

= Description =
A regular RGB LED is basically 3 LEDs (one red, one green, one blue) in parallel. This is not a smart LED, for smart LEDs see [[LED Ring NeoPixel]].

[[File:Rgb-foto.JPG|200px]]

= How to connect it electrically =
The RGB LED is connected like 3 paralell LEDs. It is important that you need one resistor for each color! The resistor goes before the LED and not onto the common ground.
There are different types - the one we use has a common ground, but there are also versions with common +.

[[File:RgbIMG 9775.jpg|400px]]

= How to control it in MicroPython =
<syntaxhighlight lang="python" line='line'>
# todo 
# code goes here
</syntaxhighlight>

= A small Program in MicroPython =
<syntaxhighlight lang="python" line='line'>
from machine import Pin, PWM
from time import sleep

# connect it to Pin 26, 27, and 14
blue = PWM(Pin(26))
green = PWM(Pin(27))
red = PWM(Pin(14))

# base frequency for PWM is 1000Hz
blue.freq(1000)
green.freq(1000)
red.freq(1000)

# this is a function to allows to give an "RGB"-Color to the LED
# duty take an argument from 0 to 2023... by multiplying the 0..255 by 4 we get 0 to 2020 - which seems close enough
def rgb(r=255,g=255,b=255):
  blue.duty(b*4)          # set duty cycle
  green.duty(g*4)          # set duty cycle
  red.duty(r*4)          # set duty cycle

# show some cases....
while True:
  rgb(255,255,255) # white
  sleep(1)
  rgb(0,0,0) # off = black
  sleep(1)
  rgb(255,0,0) # red
  sleep(1)
  rgb(0,255,0) # gree
  sleep(1)
  rgb(0,0,255) # blue
  sleep(1)
</syntaxhighlight>

[[file:Rgb-setup1.JPG|300px]]

[[file:Rgb-setup2.JPG|300px]]

[[file:Rgb-setup3.JPG|300px]]

= Related Tutorial Videos =
In this part of the tutorial, we show how to connect an RGB-LED and programming it with Micropython. We first look at what an RGB LED is by building one with 3 separate LEDs. We then look at switching it on and off and how to set the color using the duty cycle in the PWM output.

<youtube>https://youtu.be/K2m6ttZ1bJw</youtube>

= Background =
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image(s)
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 = How to control it in MicroPython =
-Switching indiviual color on and off
 <syntaxhighlight lang="python" line='line'>
-from machine import Pin
+# todo
+# code goes here
-blue = Pin(26, Pin.OUT)
-green = Pin(27, Pin.OUT)
-red = Pin(14, Pin.OUT)
-blue.on()
-green.off()
-red.off()
-</syntaxhighlight>
-Controlling intensity
-<syntaxhighlight lang="python" line='line'>
-from machine import Pin, PWM
-blue = PWM(Pin(26))
-green = PWM(Pin(27))
-red = PWM(Pin(14))
-# set PWM frequency to 1000Hz
-blue.freq(1000)
-green.freq(1000)
-red.freq(1000)
-# have blue on at about 50% intesity
-blue.duty(512)
-green.duty(0)
-red.duty(0)
-#  have red and green at full intesity (mixed color)
-blue.duty(0)
-green.duty(1023)
-red.duty(1023)
 </syntaxhighlight>