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- import time
- from rpi_ws281x import PixelStrip, Color
- # LED strip configuration:
- LED_COUNT = 64 # Number of LED pixels.
- LED_PIN = 12 # GPIO pin connected to the pixels (18 uses $
- LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800$
- LED_DMA = 10 # DMA channel to use for generating signal ($
- LED_BRIGHTNESS = 10 # Set to 0 for darkest and 255 for brightest
- LED_INVERT = False # True to invert the signal (when using NPN $
- LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53
- RIGHT_BORDER = [7,15,23,31,39,47,55,63]
- LEFT_BORDER = [0,8,16,24,32,40,48,56]
- # 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()):
- strip.setPixelColor(i, 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(), 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)
- # Create NeoPixel object with appropriate configuration.
- strip = PixelStrip(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
- # Intialize the library (must be called once before other functions).
- strip.begin()
- while True:
- # start animation
- print('Color wipe animations.')
- colorWipe(strip, Color(255, 0, 0)) # Red wipe
- colorWipe(strip, Color(0, 255, 0)) # Green wipe
- colorWipe(strip, Color(0, 0, 255)) # Blue wipe
- print('Theater chase animations.')
- theaterChase(strip, Color(127, 127, 127)) # White theater chase
- theaterChase(strip, Color(127, 0, 0)) # Red theater chase
- theaterChase(strip, Color(0, 0, 127)) # Blue theater chase
- print('Rainbow animations.')
- rainbow(strip)
- print('Wipe LEDs')
- colorWipe(strip, Color(0, 0, 0), 10)
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