LEDs on Wall

# Based on the NeoPixel library strandtest example
# (Authors: Tony DiCola - [email protected] & Jeremy Garff ([email protected]))
# https://github.com/jgarff/rpi_ws281x
# https://docs.rs/crate/ws281x/0.1.0/source/c/python/examples/strandtest.py
#
# Modifications by alcognito
#

import time
from neopixel import *
import argparse


# LED strip configuration:
LED_COUNT      = 300      # Number of LED pixels.
LED_PIN        = 18      # GPIO pin connected to the pixels (must support 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) - was 5
LED_BRIGHTNESS = 60     # 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       # set to '1' for GPIOs 13, 19, 41, 45 or 53


# Define functions which animate LEDs in various ways.
def colorWipe(strip, color, wait_ms=10):
    """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 snow_capped(strip, wait_ms=0):
    peaks = [108, 170, 258]
    low_pts = [0, 145, 202, 300]
    illuminated = set()
    for i in range(peaks[0]):
        for j in range(strip.numPixels()):
            for peak in peaks:
                if (peak - i) >= min(low_pts):
                    illuminated.add((peak - i))
                if peak + i <= max(low_pts):
                    illuminated.add((peak + i))
#               print(sorted(illuminated))

                if j in illuminated:
                    if j <= peaks[0]:
                        local_color = Color(
                                            int(255 * j/peaks[0]),
                                            int(255 * j/peaks[0]),
                                            255) # *255/peaks[0] (==2.83) was previously * 2.3
                    elif j <= low_pts[0]:
                        local_color = Color(
                                            int(255 + peaks[0]-j),
                                            int(255 + peaks[0]-j),
                                            255)
                    elif j <= peaks[1]:
                        local_color = Color(
                                            int(255 - peaks[1]+j),
                                            int(255 - peaks[1]+j),
                                            255)
                    elif j <= low_pts[1]:
                        local_color = Color(
                                            int(255 + peaks[1]-j),
                                            int(255 + peaks[1]-j),
                                            255)
                    elif j <= peaks[2]:
                        local_color = Color(
                                            int(255 - peaks[2]+j),
                                            int(255 - peaks[2]+j),
                                            255)
                    else:
                        local_color = Color(
                                            int(255 + peaks[2]-j),
                                            int(255 + peaks[2]-j),
                                            255)
                    strip.setPixelColor(j, local_color)
                    strip.show()
#           time.sleep(wait_ms/1000.0)


# Main program logic follows:
if __name__ == '__main__':
    # Process arguments
    parser = argparse.ArgumentParser()
    parser.add_argument('-c', '--clear', action='store_true', help='clear the display on exit')
    args = parser.parse_args()

    # Create NeoPixel object with appropriate configuration.
    strip = Adafruit_NeoPixel(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()

    print('Press Ctrl-C to quit.')
    if not args.clear:
        print('Use "-c" argument to clear LEDs on exit')

    try:

        while True:
            print('Color wipe animations.')
            colorWipe(strip, Color(0, 0, 0))
            print('Snow Capped Mountain animation.')
            snow_capped(strip)

    except KeyboardInterrupt:
        if args.clear:
            colorWipe(strip, Color(0,0,0), 10)