Cycle through R, G and B on a single neopixel

rgb_test.py

# 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 *

# LED strip configuration:
LED_COUNT      = 50      # 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 = 10     # Set to 0 for darkest and 255 for brightest
LED_INVERT     = False   # True to invert the signal (when using NPN transistor level shift)
LED_STRIP      = ws.WS2811_STRIP_BRG

# Define functions which animate LEDs in various ways.

def rgb_test(strip, wait_ms=500):
    rgb = [Color(255, 0, 0), Color(0, 255, 0), Color(0, 0, 255)]
    while True:
        for i in range(len(rgb)):
            print i, rgb[i]
            strip.setPixelColor(0, rgb[i])
            strip.show()
            time.sleep(wait_ms/1000.0)

# 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, 0, LED_STRIP)
    # Intialize the library (must be called once before other functions).
    strip.begin()

    print ('Press Ctrl-C to quit.')
    rgb_test(strip)