neopixel_arw.py

#!/usr/bin/env python3
import time
from rpi_ws281x import PixelStrip, Color


#levelcolor =[[255,0,0],[255,0,0],[255,255,0],[255,255,0],[0, 255, 0],[0, 255, 0],[25,25,25],[0, 255, 0],[0, 255, 0],[255,255,0],[255,255,0],[255,0,0],[255,0,0]]
#levelcolor =[[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[10,10,10],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0]]

def colorarw(strip,arw):
    """Wipe color across display a pixel at a time."""
    levelcolor =[[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[10,10,10],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0]]
    if arw > 12:
        arw = 12
    elif arw < -12:
        arw = -12
    aarw = int(arw/2 )

    n = aarw +6
    for i in range(13):
        strip.setPixelColorRGB(i,0,0,0)   
    strip.setPixelColorRGB(n, levelcolor[n][0],levelcolor[n][1],levelcolor[n][2]) 
    #strip.setPixelColorRGB(6, 5,5,5)
    strip.show()

def wcolorarw(strip,arw):
    """Wipe color across display a pixel at a time."""
    levelcolor =[[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],[0,0,255],\
        [10,10,10],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0],[255,0,0]]
    if arw > 12:
        arw = 12
    elif arw < -12:
        arw = -12
    aarw = -int(arw )

    n = aarw +12
    for i in range(25):
        strip.setPixelColorRGB(i,0,0,0)   
    strip.setPixelColorRGB(n, levelcolor[n][0],levelcolor[n][1],levelcolor[n][2]) 
    #strip.setPixelColorRGB(6, 5,5,5)
    strip.show()


if __name__ == '__main__':
    # LED strip configuration:
    LED_COUNT      = 25     # Number of LED pixels.
    LED_PIN        = 18      # GPIO pin connected to the pixels (18 uses PWM!).
    #LED_PIN        = 10      # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
    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

    # 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()
    try:

        while True:
            for j in range(-13,13):
                wcolorarw(strip,j)
                time.sleep(0.05)
            for j in range(13,-13,-1):
                wcolorarw(strip,j)
                time.sleep(0.05)                
            
    except KeyboardInterrupt:
            colorarw(0)