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#!/usr/bin/env python
import time
from neopixel import *


# LED strip configuration:
LED_COUNT      	= 15      		# Number of LED pixels.
LED_PIN        	= 18      		# GPIO pin connected to the pixels (must support PWM!).
LED_FREQ_HZ    	= 800000	   	# LED signal frequency in hertz (usually 800khz)
LED_DMA        	= 5      		# DMA channel to use for generating signal (try 5)
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)

ZEIT = 800.0
FARBE = LED_BRIGHTNESS/4
FARBE2 = FARBE/4


# Define functions which animate LEDs in various ways.
def ledOff(strip, color):
	for i in range((LED_COUNT)):
	  strip.setPixelColor(i, Color(0, 0, 0))
	  strip.show()

def ledKittfadein(strip, color, wait_ms=50):
	for i in range(0, 255, 10):
		for j in range(strip.numPixels()):
			strip.setPixelColor(j, Color( i, 0, 0))
			strip.show()
			time.sleep(wait_ms/20000)
	for i in range(255, -1, -5):
		for j in range(strip.numPixels()):
			strip.setPixelColor(j, Color( i, 0, 0))
			strip.show()
			time.sleep(wait_ms/20000)
	ledOff(strip, color)
	  
def ledKitt(strip, color, wait_ms=50):
#      for x in range(1, LED_COUNT, 1):
		for i in range(14, 0, -1):
			y=i
			strip.setPixelColor(i, color)
			y=y+1
			strip.setPixelColor(y, Color((FARBE), 0, 0))
			strip.setPixelColor((y+1), Color((FARBE2), 0, 0))
			strip.show()
			time.sleep(wait_ms/ZEIT)
			strip.setPixelColor((y+1), Color(0, 0, 0))
			
		for j in range(0, 14, 1):
			z=j
			strip.setPixelColor(j, color)
			z=z+1
			strip.setPixelColor(z, Color(255, 0, 0))
			strip.setPixelColor((z-1), Color((FARBE), 0, 0))
			strip.setPixelColor((z-2), Color((FARBE2), 0, 0))
			strip.show()
			time.sleep(wait_ms/ZEIT)
			strip.setPixelColor((z-1), Color(0, 0, 0))
			strip.setPixelColor((z-2), Color(0, 0, 0))
# Main program logic follows:
if __name__ == '__main__':
	# Create NeoPixel object with appropriate configuration.
	strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS)
	# Intialize the library (must be called once before other functions).
	strip.begin()
	print 'Press Ctrl-C to quit.'
	ledKittfadein(strip, Color(255, 0, 0))
	while True:
		ledKitt(strip, Color(255, 0, 0))