pip install rpi_ws281x

[Vs-legend]

import time
from rpi_ws281x import PixelStrip, Color

LED strip configuration:

LED_COUNT = 30 # Number of LED pixels.
LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 10 # DMA channel to use for generating signal (try 10)
LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
LED_CHANNEL = 0

Define functions to create RGB lighting effects

def color_wipe(strip, color, wait_ms=50):
"""Wipe color across display a pixel at a time."""
for i in range(strip.numPixels()):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms / 1000.0)

def theater_chase(strip, color, wait_ms=50, iterations=10):
"""Movie theater light style chaser animation."""
for j in range(iterations):
for q in range(3):
for i in range(0, strip.numPixels(), 3):
strip.setPixelColor(i + q, color)
strip.show()
time.sleep(wait_ms / 1000.0)
for i in range(0, strip.numPixels(), 3):
strip.setPixelColor(i + q, 0)

def wheel(pos):
"""Generate rainbow colors across 0-255 positions."""
if pos < 85:
return Color(pos * 3, 255 - pos * 3, 0)
elif pos < 170:
pos -= 85
return Color(255 - pos * 3, 0, pos * 3)
else:
pos -= 170
return Color(0, pos * 3, 255 - pos * 3)

def rainbow(strip, wait_ms=20, iterations=1):
"""Draw rainbow that fades across all pixels at once."""
for j in range(256 * iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel((i + j) & 255))
strip.show()
time.sleep(wait_ms / 1000.0)

Main program logic follows:

if name == 'main':
# Create PixelStrip object with appropriate configuration.
strip = PixelStrip(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
# Initialize the library (must be called once before other functions).
strip.begin()

print('Press Ctrl-C to quit.')
while True:
    # Color wipe animations.
    color_wipe(strip, Color(255, 0, 0))  # Red wipe
    color_wipe(strip, Color(0, 255, 0))  # Green wipe
    color_wipe(strip, Color(0, 0, 255))  # Blue wipe
    # Theater chase animations.
    theater_chase(strip, Color(127, 127, 127))  # White theater chase
    theater_chase(strip, Color(127, 0, 0))  # Red theater chase
    theater_chase(strip, Color(0, 0, 127))  # Blue theater chase
    # Rainbow animations.
    rainbow(strip)