KY-029 2-Color 3mm LED

This LED module contains two LEDs in the colors red and green, which are connected to each other via a common cathode. This means that both LEDs share the same negative connection, which simplifies the circuit. By controlling the individual LEDs, you can generate different color signals to indicate operating states or warnings, for example. The compact design and easy integration make this module ideal for a variety of applications where colour visualization is required, such as in control systems, displays or decorative projects.

Series resistors:

Depending on the input voltage, series resistors are required.

Pin assignment

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.

# Required modules are imported and set up
from gpiozero import LED
import time

# Initialization of the LEDs
led_red = LED(24)
led_green = LED(23)

print("LED test [press CTRL+C to end the test]")

# Main program loop
try:
    while True:
        print("LED RED on for 3 seconds")
        led_red.on()  # Red LED is switched on
        led_green.off()  # Green LED is switched off
        time.sleep(3)  # Wait mode for 3 seconds

        print("LED GREEN on for 3 seconds")
        led_red.off()  # Red LED is switched off
        led_green.on()  # Green LED is switched on
        time.sleep(3)  # Wait mode for 3 seconds

# Clean-up work after the program has been completed
except KeyboardInterrupt:
    print("Program was interrupted by user")
    led_red.close()  # Release resources for red LED
    led_green.close()  # Release resources for green LED

}

Code example (PWM)

Pulse width modulation [PWM] can be used to regulate the brightness of an LED - in this process, the LED is switched on and off at specific time intervals, with the ratio of the switch-on and switch-off times 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 by Analog IC Tips.

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

# Required modules are imported and set up
import random, time
from gpiozero import PWMLED

# Initialization of the LEDs
led_red = PWMLED(24)
led_green = PWMLED(23)

# This function generates the actual color
# The color intensity can be changed using the respective color variable
# After the color has been set, the time is defined using "time.sleep",
# how long the color in question should be displayed
def led_color(red, green, pause):
    led_red.value = red / 100  # Value range from 0 to 1
    led_green.value = green / 100
    time.sleep(pause)
    
    led_red.value = 0
    led_green.value = 0

print("LED test [press CTRL+C to end the test]")

# Main program loop:
# This has the task of creating a separate variable for each individual color
# and to run through the color intensity of each individual color from 0-100% using a For loop
# By mixing the different brightness levels of the respective colors
# thus creating a color gradient
try:
    while True:
        for x in range(0, 2):
            for y in range(0, 2):
                print(x, y)
                for i in range(0, 101):
                    led_color(x * i, y * i, 0.02)

# Clean-up work after the program has been completed
except KeyboardInterrupt:
    led_red.close()
    led_green.close()