Datasheet

Now create a file neopixels.py and fill it with the following code:

import time

import Adafruit_GPIO as GPIO

import Adafruit_GPIO.FT232H as FT232H

class NeoPixel_FT232H(object):

def __init__(self, n):

# Create an FT232H object.

self.ft232h = FT232H.FT232H()

# Create a SPI interface for the FT232H object. Set the SPI bus to 6mhz.

self.spi = FT232H.SPI(self.ft232h, max_speed_hz=6000000)

# Create a pixel data buffer and lookup table.

self.buffer = bytearray(n*24)

self.lookup = self.build_byte_lookup()

def build_byte_lookup(self):

# Create a lookup table to map all byte values to 8 byte values which

# represent the 6mhz SPI data to generate the NeoPixel signal for the

# specified byte.

lookup = {}

for i in range(256):

value = bytearray()

for j in range(7, -1, -1):

if ((i >> j) & 1) == 0:

value.append(0b11100000)

else:

value.append(0b11111000)

lookup[i] = value

return lookup

def set_pixel_color(self, n, r, g, b):

# Set the pixel RGB color for the pixel at position n.

# Assumes GRB NeoPixel color ordering, but it's easy to change below.

index = n*24

self.buffer[index :index+8 ] = self.lookup[int(g)]

self.buffer[index+8 :index+16] = self.lookup[int(r)]

self.buffer[index+16:index+24] = self.lookup[int(b)]

def show(self):

# Send the pixel buffer out the SPI data output pin (D1) as a NeoPixel

# signal.

self.spi.write(self.buffer)