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white-fade.py
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white-fade.py
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#!/usr/bin/env python3
# NeoPixel library strandtest example
# Author: Tony DiCola (tony@tonydicola.com)
#
# Direct port of the Arduino NeoPixel library strandtest example. Showcases
# various animations on a strip of NeoPixels.
import time
from neopixel import *
import argparse
import os
import subprocess
import sys
import utils as cc
EPSILON = sys.float_info.epsilon # Smallest possible difference.
# LED strip configuration:
LED_COUNT = 32 # 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) 800000
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 # set to '1' for GPIOs 13, 19, 41, 45 or 53
STEPS_DEFA = 0
# 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()):
# time.sleep(wait_ms/1000.0)
strip.setPixelColor(i, color)
strip.show()
def revsere():
for c in reversed(range(0,256)):
colorWipe(strip, Color(c,c,c), 1)
print("i c ", c)
if c >= 253:
break
# Main program logic follows:
if __name__ == '__main__':
wait_ms = 50
# 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()
try:
while True:
for i in range(0,256):
if i >= 253:
revsere()
else:
colorWipe(strip, Color(i,i,i), 1)
print("i ", i)
except KeyboardInterrupt:
if args.clear:
colorWipe(strip, Color(0,0,0), 10)