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Strandtest.py
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import time
import sys
from rpi_ws281x import *
# LED strip configuration:
LED_COUNT = 150 # Number of LED pixels.
LED_PIN = 12 # GPIO pin connected to the pixels (must support 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
#LED_STRIP = ws.SK6812_STRIP_RGBW
LED_STRIP = ws.SK6812W_STRIP
# Define functions which animate LEDs in various ways.
def colorWipe(strip, color, wait_ms=50):
"""Wipe color across display a pixel at a time."""
for i in range(strip.numPixels() - 68):
strip.setPixelColor(i+68, color)
strip.show()
time.sleep(wait_ms/1000.0)
def theaterChase(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() - 68, 3):
strip.setPixelColor(i+q+68, color)
strip.show()
time.sleep(wait_ms/1000.0)
for i in range(0, strip.numPixels() - 68, 3):
strip.setPixelColor(i+q+68, 0)
def wheel(pos):
"""Generate rainbow colors across 0-255 positions."""
if pos < 85:
return (pos * 3, 255 - pos * 3, 0)
elif pos < 170:
pos -= 85
return (255 - pos * 3, 0, pos * 3)
else:
pos -= 170
return (0, pos * 3, 255 - pos * 3)
def rainbow(strip, wait_ms=20, iterations=7):
"""Draw rainbow that fades across all pixels at once."""
for j in range(256*iterations):
for i in range(strip.numPixels() - 68):
strip.setPixelColor(i+68, wheel((i+j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
def rainbowCycle(strip, wait_ms=20, iterations=7):
"""Draw rainbow that uniformly distributes itself across all pixels."""
for j in range(256*iterations):
for i in range(strip.numPixels() - 68):
strip.setPixelColor(i+68, wheel(((i * 256 // strip.numPixels()) + j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
def theaterChaseRainbow(strip, wait_ms=50):
"""Rainbow movie theater light style chaser animation."""
for j in range(256):
for q in range(3):
for i in range(0, strip.numPixels() - 68, 3):
strip.setPixelColor(i+q+68, wheel((i+j) % 255))
strip.show()
time.sleep(wait_ms/1000.0)
for i in range(0, strip.numPixels() - 68, 3):
strip.setPixelColor(i+q+68, 0)
"""
# Color wipe animations.
colorWipe(strip, Color(255, 0, 0)) # Red wipe
colorWipe(strip, Color(0, 255, 0)) # Blue wipe
colorWipe(strip, Color(0, 0, 255)) # Green wipe
colorWipe(strip, Color(0, 0, 0, 255)) # White wipe
colorWipe(strip, Color(255, 255, 255)) # Composite White wipe
colorWipe(strip, Color(255, 255, 255, 255)) # Composite White + White LED wipe
# Theater chase animations.
theaterChase(strip, Color(127, 0, 0)) # Red theater chase
theaterChase(strip, Color(0, 127, 0)) # Green theater chase
theaterChase(strip, Color(0, 0, 127)) # Blue theater chase
theaterChase(strip, Color(0, 0, 0, 127)) # White theater chase
theaterChase(strip, Color(127, 127, 127, 0)) # Composite White theater chase
theaterChase(strip, Color(127, 127, 127, 127)) # Composite White + White theater chase
# Rainbow animations.
rainbow(strip)
rainbowCycle(strip)
theaterChaseRainbow(strip)
"""
# Main program logic follows:
if __name__ == '__main__':
if len(sys.argv) == 1:
LED_BRIGHTNESS = 255
else:
LED_BRIGHTNESS = int(sys.argv[1])
# Create NeoPixel object with appropriate configuration.
strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL, LED_STRIP)
# Intialize the library (must be called once before other functions).
strip.begin()
print(LED_BRIGHTNESS)
print ('Press Ctrl-C to quit.')
while True:
# Color wipe animations.
colorWipe(strip, Color(255, 0, 0)) # Red wipe
colorWipe(strip, Color(0, 255, 0)) # Blue wipe
colorWipe(strip, Color(0, 0, 255)) # Green wipe
colorWipe(strip, Color(0, 0, 0, 255)) # White wipe
# Rainbow animations.
rainbow(strip)
rainbowCycle(strip)