LED strip example v2

example.py

#!/usr/bin/env python
import time
import socket
import struct
import colorsys

class LEDs(object):
    def __init__(self):
        self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    def _conv(self, x):
        if x<0: return 0
        if x>1: return 31
        return int(round(x*31))

    # colors is a list of 198 (r,g,b) tuples where each
    # color component is a float between 0 and 1.
    def send(self, colors):
        dat = ''
        for cx in colors:
            r,g,b = map(self._conv, cx)
            dat += struct.pack('<H',
                (b << 10) | (r << 5) | g)

        self._sock.sendto(dat, ('10.5.0.6', 2772))

leds = LEDs()

PER = 10
 
while True:
    t = (time.time() % PER) / PER
    color = colorsys.hsv_to_rgb(t, 1, 1)
    leds.send([color] * 198)