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neopix.py
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#!/usr/bin/python
# Import library functions we need
import sys
import time
try:
from rpi_ws281x import __version__, PixelStrip, Adafruit_NeoPixel, Color
except ImportError:
from neopixel import Adafruit_NeoPixel as PixelStrip, Color
__version__ = "legacy"
try:
raw_input # Python 2
except NameError:
raw_input = input # Python 3
# LED strip configuration:
LED_COUNT = 8 # 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 = 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 # PWM channel
LED_GAMMA = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,
2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5,
6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 11,
11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18,
19, 19, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 27, 27, 28,
29, 29, 30, 31, 31, 32, 33, 34, 34, 35, 36, 37, 37, 38, 39, 40,
40, 41, 42, 43, 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70,
71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 83, 84, 85, 86, 88, 89,
90, 91, 93, 94, 95, 96, 98, 99,100,102,103,104,106,107,109,110,
111,113,114,116,117,119,120,121,123,124,126,128,129,131,132,134,
135,137,138,140,142,143,145,146,148,150,151,153,155,157,158,160,
162,163,165,167,169,170,172,174,176,178,179,181,183,185,187,189,
191,193,194,196,198,200,202,204,206,208,210,212,214,216,218,220,
222,224,227,229,231,233,235,237,239,241,244,246,248,250,252,255]
LED_COUNT = max(0,int(sys.argv[1]))
WAIT_MS = max(0,int(sys.argv[2]))
MODE = sys.argv[3]
LED_BRIGHTNESS = min(255,int(max(0,float(sys.argv[4])) * 255 / 100))
if (sys.argv[5].lower() != "true"):
LED_GAMMA = range(256)
def getRGBfromI(RGBint):
blue = RGBint & 255
green = (RGBint >> 8) & 255
red = (RGBint >> 16) & 255
return red, green, blue
# Define functions which animate LEDs in various ways.
def setPixel(strip, i, color):
"""Set a single pixel"""
strip.setPixelColor(i, color)
strip.show()
def setPixels(strip, s, e, color, wait_ms=30):
"""Set pixels from s(tart) to e(nd)"""
if (wait_ms > 0):
for i in range(s, e+1):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms/1000.0)
else:
for i in range(s, e+1):
strip.setPixelColor(i, color)
strip.show()
def setBrightness(strip, brightness, wait_ms=30):
"""Set overall brighness"""
strip.setBrightness(brightness)
strip.show()
time.sleep(wait_ms/1000.0)
def colorWipe(strip, color, wait_ms=30):
"""Wipe color across display a pixel at a time."""
if (wait_ms > 0):
for i in range(strip.numPixels()):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms/1000.0)
else:
for i in range(strip.numPixels()):
strip.setPixelColor(i, color)
strip.show()
def shiftUp(strip, color, wait_ms=30):
"""Shift all pixels one way."""
oldcolour = strip.getPixelColor(0)
strip.setPixelColor(0, color)
strip.show()
if (wait_ms > 0):
time.sleep(wait_ms/1000.0)
for i in range(1,LED_COUNT):
newcolour = oldcolour
oldcolour = strip.getPixelColor(i)
strip.setPixelColor(i, newcolour)
strip.show()
time.sleep(wait_ms/1000.0)
else:
for i in range(1,LED_COUNT):
newcolour = oldcolour
oldcolour = strip.getPixelColor(i)
strip.setPixelColor(i, newcolour)
strip.show()
def shiftDown(strip, color, wait_ms=30):
"""Shift all pixels the other way."""
oldcolour = strip.getPixelColor(LED_COUNT-1)
strip.setPixelColor(LED_COUNT-1, color)
strip.show()
if (wait_ms > 0):
time.sleep(wait_ms/1000.0)
for i in range(LED_COUNT-2,-1,-1):
newcolour = oldcolour
oldcolour = strip.getPixelColor(i)
strip.setPixelColor(i, newcolour)
strip.show()
time.sleep(wait_ms/1000.0)
else:
for i in range(LED_COUNT-2,-1,-1):
newcolour = oldcolour
oldcolour = strip.getPixelColor(i)
strip.setPixelColor(i, newcolour)
strip.show()
def wheel(pos):
"""Generate rainbow colors across 0-255 positions."""
if pos < 85:
return Color(pos * 3, 255 - pos * 3, 0)
elif pos < 170:
pos -= 85
return Color(255 - pos * 3, 0, pos * 3)
else:
pos -= 170
return Color(0, pos * 3, 255 - pos * 3)
def rainbow(strip, wait_ms=20, iterations=2):
"""Draw rainbow that fades across all pixels at once."""
for j in range(256*iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel((i+j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
def rainbowCycle(strip, wait_ms=20, iterations=2):
"""Draw rainbow that uniformly distributes itself across all pixels."""
for j in range(256*iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel(((i * 256 / strip.numPixels()) + j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
# Main loop:
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)
if __version__ == "legacy":
strip = PixelStrip(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
else:
strip = PixelStrip(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL, LED_GAMMA)# Intialize the library (must be called once before other functions).
strip.begin()
## Color wipe animations.
colorWipe(strip, Color(127, 0, 0), WAIT_MS) # Red wipe
colorWipe(strip, Color(0, 127, 0), WAIT_MS) # Green wipe
colorWipe(strip, Color(0, 0, 127), WAIT_MS) # Blue wipe
colorWipe(strip, Color(0, 0, 0), WAIT_MS) # Off wipe
## Rainbow animations.
#rainbow(strip)
#rainbowCycle(strip)
#colorWipe(strip, Color(0, 0, 0)) # Off wipe
while True:
try:
data = raw_input()
bits = data.split(',')
if len(bits) == 2:
if bits[0] == "brightness":
setBrightness(strip, min(255,max(0,int(bits[1]))), WAIT_MS)
if len(bits) == 3:
if MODE == "shiftu":
shiftUp(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
elif MODE == "shiftd":
shiftDown(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
else:
colorWipe(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
if (MODE[0] == 'p' and len(bits) == 4):
setPixel(strip, int(bits[0]), Color(int(bits[1]), int(bits[2]), int(bits[3]) ))
if (MODE[0] == 'p' and len(bits) == 5):
setPixels(strip, int(bits[0]), int(bits[1]), Color(int(bits[2]), int(bits[3]), int(bits[4]) ), WAIT_MS)
except (EOFError, SystemExit): # hopefully always caused by us sigint'ing the program
sys.exit(0)
except Exception as ex:
print("bad data: "+data)
print(ex)