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116 lines
4.3 KiB
116 lines
4.3 KiB
#!/usr/bin/env python3
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# NeoPixel library strandtest example
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# Author: Tony DiCola (tony@tonydicola.com)
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#
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# Direct port of the Arduino NeoPixel library strandtest example. Showcases
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# various animations on a strip of NeoPixels.
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import time
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from neopixel import *
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import argparse
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# LED strip configuration:
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LED_COUNT = 16 # Number of LED pixels.
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LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
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#LED_PIN = 10 # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
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LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
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LED_DMA = 10 # DMA channel to use for generating signal (try 10)
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LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
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LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
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LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53
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# Define functions which animate LEDs in various ways.
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def colorWipe(strip, color, wait_ms=50):
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"""Wipe color across display a pixel at a time."""
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, color)
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strip.show()
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time.sleep(wait_ms/1000.0)
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def theaterChase(strip, color, wait_ms=50, iterations=10):
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"""Movie theater light style chaser animation."""
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for j in range(iterations):
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for q in range(3):
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, color)
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strip.show()
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time.sleep(wait_ms/1000.0)
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, 0)
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def wheel(pos):
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"""Generate rainbow colors across 0-255 positions."""
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if pos < 85:
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return Color(pos * 3, 255 - pos * 3, 0)
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elif pos < 170:
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pos -= 85
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return Color(255 - pos * 3, 0, pos * 3)
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else:
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pos -= 170
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return Color(0, pos * 3, 255 - pos * 3)
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def rainbow(strip, wait_ms=20, iterations=1):
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"""Draw rainbow that fades across all pixels at once."""
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for j in range(256*iterations):
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, wheel((i+j) & 255))
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strip.show()
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time.sleep(wait_ms/1000.0)
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def rainbowCycle(strip, wait_ms=20, iterations=5):
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"""Draw rainbow that uniformly distributes itself across all pixels."""
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for j in range(256*iterations):
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, wheel((int(i * 256 / strip.numPixels()) + j) & 255))
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strip.show()
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time.sleep(wait_ms/1000.0)
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def theaterChaseRainbow(strip, wait_ms=50):
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"""Rainbow movie theater light style chaser animation."""
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for j in range(256):
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for q in range(3):
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, wheel((i+j) % 255))
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strip.show()
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time.sleep(wait_ms/1000.0)
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, 0)
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# Main program logic follows:
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if __name__ == '__main__':
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# Process arguments
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parser = argparse.ArgumentParser()
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parser.add_argument('-c', '--clear', action='store_true', help='clear the display on exit')
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args = parser.parse_args()
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# Create NeoPixel object with appropriate configuration.
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strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
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# Intialize the library (must be called once before other functions).
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strip.begin()
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print ('Press Ctrl-C to quit.')
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if not args.clear:
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print('Use "-c" argument to clear LEDs on exit')
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try:
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while True:
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print ('Color wipe animations.')
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colorWipe(strip, Color(255, 0, 0)) # Red wipe
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colorWipe(strip, Color(0, 255, 0)) # Blue wipe
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colorWipe(strip, Color(0, 0, 255)) # Green wipe
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print ('Theater chase animations.')
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theaterChase(strip, Color(127, 127, 127)) # White theater chase
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theaterChase(strip, Color(127, 0, 0)) # Red theater chase
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theaterChase(strip, Color( 0, 0, 127)) # Blue theater chase
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print ('Rainbow animations.')
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rainbow(strip)
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rainbowCycle(strip)
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theaterChaseRainbow(strip)
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except KeyboardInterrupt:
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if args.clear:
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colorWipe(strip, Color(0,0,0), 10)
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