KY-009 RGB SMD-LED

This LED module contains three different LEDs in the colors red, blue and green. These three LEDs are connected to each other via a common cathode, which means that they all share the same negative connection. The red LED requires a voltage of 1.8 V to light up, while the green and blue LEDs each require a voltage of 2.8 V. All LEDs operate at a current of 20 mA.

With this module, you can create a variety of color combinations by adjusting the brightness of the individual LEDs. By mixing red, green and blue, almost all colors of the visible spectrum can be created. The module is ideal for projects where visual signals, displays or decorative lighting effects are required.

The compact design allows easy integration into various circuits and projects. Whether you are a beginner or an experienced developer, this LED module offers a flexible and versatile solution for your lighting needs. Thanks to the clear color output and simple control, you can realize creative and impressive light installations.

Series resistors:

Depending on the input voltage, series resistors are required.

Pin assignment

1. Code example: ON/OFF

This code example shows how the integrated LEDs can be changed alternately, every 3 seconds, by means of a definable output pin.

To load the following code example onto your Pico, we recommend using the Thonny IDE. All you have to do first is go to Run > Configure interpreter ... > Interpreter > Which kind of interpreter should Thonny use for running your code? and select MicroPython (Raspberry Pi Pico).

Now copy the code below into your IDE and click on Run.

# Load libraries
from machine import Pin, PWM
from time import sleep

# Initialization of GPIO26, GPIO27 and GPIO28 as output
Green = Pin(28, Pin.OUT)
Red = Pin(27, Pin.OUT)
Blue = Pin(26, Pin.OUT)
  
while True:
    # green light
    Green.value(1)
    Red.value(0)
    Blue.value(0)
    sleep(3)
    # red light
    Green.value(0)
    Red.value(1)
    Blue.value(0)
    sleep(3)
    # blue light
    Green.value(0)
    Red.value(0)
    Blue.value(1)
    sleep(3)
    # Switch off LED
    Green.value(0)
    Red.value(0)
    Blue.value(0)
    sleep(3)
    # yellow light
    Green.value(1)
    Red.value(1)
    Blue.value(0)
    sleep(3)
    # turquoise light
    Green.value(1)
    Red.value(0)
    Blue.value(1)
    sleep(3)
    # pink light
    Green.value(0)
    Red.value(1)
    Blue.value(1)
    sleep(3)
    # Switch off LED
    Green.value(0)
    Red.value(0)
    Blue.value(0)
    sleep(3)

2. Code example: PWM

By means of pulse width modulation [PWM], the brightness of an LED can be regulated - in this process, the LED is switched on and off at specific time intervals, with the ratio of the switch-on and switch-off time corresponding to a relative brightness. Due to the inertia of human vision, human eyes interpret such on/off behavior as a change in brightness. More information on this topic can be found in this article from mikrokontroller.net.

Several LEDs are integrated in this module - different colors can thus be created by superimposing different brightness levels. This is shown in the following code example.

To load the following code example onto your Pico, we recommend using the Thonny IDE. All you have to do first is go to Run > Configure interpreter ... > Interpreter > Which kind of interpreter should Thonny use for running your code? and select MicroPython (Raspberry Pi Pico).

Now copy the code below into your IDE and click on Run.

# Load libraries
import machine
import math

# Initialization of GPIO26, GPIO27 and GPIO28 as PWM Pin
ledRed = machine.PWM(machine.Pin(27))
ledRed.freq(1000)
ledBlue = machine.PWM(machine.Pin(26))
ledBlue.freq(1000)
ledGreen = machine.PWM(machine.Pin(28))
ledGreen.freq(1000)

# Definition of a 3 digit list
RBG = [0,0,0]

# Function: Color space calculation for red, green and blue 
# Green is 120° offset from red 
# Blue is 240° offset from red
def sinColour(number):
    a = (math.sin(math.radians(number))+1)*32768
    b = (math.sin(math.radians(number+120))+1)*32768
    c = (math.sin(math.radians(number+240))+1)*32768
    RBG = (int(a),int(b),int(c))
    return RBG

# Endless loop where the color value for all 3 colors is shifted again and again by 0.01
a = 0

while True:
    RBG = sinColour(a)
    a += 0.01
    if a == 360:
        a = 0
    ledRed.duty_u16(RBG[0])
    ledBlue.duty_u16(RBG[1])
    ledGreen.duty_u16(RBG[2])