92 lines
3 KiB
Python
92 lines
3 KiB
Python
#!/usr/bin/env python3
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# rpi_ws281x library strandtest example
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# Initial author: Tony DiCola (tony@tonydicola.com)
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# Author: Damien Broqua (contact@darkou.fr)
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import time
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from rpi_ws281x import *
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import argparse
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import RPi.GPIO as GPIO
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# LED strip configuration:
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LED_COUNT = 60 # 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_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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LED_DISPLAY = True
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BUTTON = 16
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def handlePushButton(button):
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global LED_DISPLAY
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LED_DISPLAY = not LED_DISPLAY
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print ('Pushed !')
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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 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 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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if LED_DISPLAY == False:
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break
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strip.show()
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time.sleep(wait_ms/1000.0)
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if LED_DISPLAY == False:
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break
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# Main program logic follows:
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if __name__ == '__main__':
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global BUTTON
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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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GPIO.setmode(GPIO.BOARD)
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GPIO.setup(BUTTON, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
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GPIO.add_event_detect(BUTTON, GPIO.FALLING, callback=handlePushButton, bouncetime=250)
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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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if LED_DISPLAY == True:
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rainbowCycle(strip)
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else:
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colorWipe(strip, Color(0,0,0), 10)
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except KeyboardInterrupt:
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if args.clear:
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print("Done")
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colorWipe(strip, Color(0,0,0), 10)
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