Playing with my raspberry & some adafruit RGB Pixels

examples.py

#!/usr/bin/python

# Color control for http://www.adafruit.com/blog/2011/07/18/updated-product-12mm-diffused-digital-rgb-led-pixels-strand-of-25/
# based on this gist: https://gist.github.com/3900703
# based on Adafruits examples
import RPi.GPIO as GPIO, time, math

# Configurable values
stripLength = 25

colorList = [
   [255,000,000],
   [255,165,000],
   [255,255,000],
   [000,128,000],
   [000,000,255],
   [075,000,130],
   [238,130,238]
]
curColor = 1
modifier = 1

# rainbow function

def rainbowFillStrip(strip):
    global stripLength, curColor
    for x in range(stripLength):
        x3 = x * 3
        strip[x3]   = colorList[curColor][0]
        strip[x3+1] = colorList[curColor][1]
        strip[x3+2] = colorList[curColor][2]

        curColor = curColor + 1
        if curColor >= len(colorList):
            curColor = 0

# signal
def signalFillStrip(strip, color):
    global stripLength, curColor, modifier

    for x in range(stripLength):
        x3 = x * 3
        strip[x3]   = 0
        strip[x3+1] = 0
        strip[x3+2] = 0

    cur3 = curColor * 3
    strip[cur3]   = color[0]
    strip[cur3+1] = color[1]
    strip[cur3+2] = color[2]

    curColor = curColor + modifier
    if curColor >= stripLength-3:
        modifier = -1
    if curColor <= 0:
        modifier = 1

def justFill(strip, color):
    global sripLength
    for x in range(stripLength):
        x3 = x * 3
        strip[x3]   = color[0]
        strip[x3+1] = color[1]
        strip[x3+2] = color[2]


# Open SPI device, load image in RGB format and get dimensions:
dev       = "/dev/spidev0.0"
spidev    = file(dev, "wb")
 
# Create list of bytearrays, one for each column of image.
# R, G, B byte per pixel, plus extra '0' byte at end for latch.
print "Allocating..."
strip = bytearray(stripLength*3 + 1)


print "Displaying..."

i = 0

while True:
    rainbowFillStrip(strip)
    spidev.write(strip)
    spidev.flush()
    time.sleep(1.05)
    i = i + 1
    if i > 4:
       break

i = 0
while True:
    rainbowFillStrip(strip)
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.25)
    i = i + 1
    if i > 10:
       break
i = 0
while True:
    rainbowFillStrip(strip)
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.05)
    i = i + 1
    if i > 40:
       break


i = 0
curColor = 0

while True:
    signalFillStrip(strip, [40,240,0])
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.05)
    i = i + 1
    if i > 70:
       break

i = 0
curColor = 0

while True:
    signalFillStrip(strip, [0,140,240])
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.02)
    i = i + 1
    if i > 120:
       break


i = 0
curColor = 0

while True:
    signalFillStrip(strip, [240,40,0])
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.01)
    i = i + 1
    if i > 120:
       break

i = 0
while True:
    justFill(strip, [i,i,i])
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.01)
    i = i + 1
    if i > 255:
       break

i = 0
while True:
    justFill(strip, [255-i,255-i,255-i])
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.01)
    i = i + 1
    if i > 255:
       break

i = 0
while True:
    justFill(strip, [0,i,i/2])
    spidev.write(strip)
    spidev.flush()
    time.sleep(0.01)
    i = i + 1
    if i > 255:
       break