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#!/usr/bin/env python 
# Light painting / POV demo for Raspberry Pi using
# Adafruit Digital Addressable RGB LED flex strip.
# ----> http://adafruit.com/products/306
from bootstrap import * 
import RPi.GPIO as GPIO, Image, time
 
# Configurable values
filename  = "fry.jpg"
dev       = "/dev/spidev0.0"
dl	  = 1 
# Open SPI device, load image in RGB format and get dimensions:
spidev    = file(dev, "wb")
print "Loading..."
img       = Image.open(filename).convert("RGB")
pixels    = img.load()
width     = img.size[0]
height    = img.size[1]
print "%dx%d pixels" % img.size
# To do: add resize here if image is not desired height
 
# Calculate gamma correction table.  This includes
# LPD8806-specific conversion (7-bit color w/high bit set).
gamma = bytearray(256)
for i in range(256):
	gamma[i] = 0x80 | int(pow(float(i) / 255.0, 2.5) * 127.0 + 0.5)
 
# 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..."
column = [0 for x in range(width)]
for x in range(width):
	column[x] = bytearray(height * 3 + 1)
 
# Convert 8-bit RGB image into column-wise GRB bytearray list.
print "Converting..."
for x in range(width):
	for y in range(height):
		value = pixels[x, y]
		y3 = y * 3
		column[x][y3]     = gamma[value[2]]
		column[x][y3 + 1] = gamma[value[0]]
		column[x][y3 + 2] = gamma[value[1]]
 
 
# Then it's a trivial matter of writing each column to the SPI port.
print "Displaying..."
while True:
     if dl < 2:	
	for x in range(width):
                spidev.write(column[x])
                spidev.flush()
		time.sleep(0.101)
	time.sleep(3.5)        
      dl = dl + 2 

Code: Alles auswählen

#!/usr/bin/python
 
# Light painting / POV demo for Raspberry Pi using
# Adafruit Digital Addressable RGB LED flex strip.
# ----> http://adafruit.com/products/306
 
import RPi.GPIO as GPIO, Image, time
 
# Configurable values
filename  = "fry.jpg"
dev       = "/dev/spidev0.0"
 
# Open SPI device, load image in RGB format and get dimensions:
spidev    = file(dev, "wb")
print "Loading..."
img       = Image.open(filename).convert("RGB")
pixels    = img.load()
width     = img.size[0]
height    = img.size[1]
print "%dx%d pixels" % img.size
# To do: add resize here if image is not desired height
 
# Calculate gamma correction table.  This includes
# LPD8806-specific conversion (7-bit color w/high bit set).
gamma = bytearray(256)
for i in range(256):
	gamma[i] = 0x80 | int(pow(float(i) / 255.0, 2.5) * 127.0 + 0.5)
 
# 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..."
column = [0 for x in range(width)]
for x in range(width):
	column[x] = bytearray(height * 3 + 1)
 
# Convert 8-bit RGB image into column-wise GRB bytearray list.
print "Converting..."
for x in range(width):
	for y in range(height):
		value = pixels[x, y]
		y3 = y * 3
		column[x][y3]     = gamma[value[2]]
		column[x][y3 + 1] = gamma[value[0]]
		column[x][y3 + 2] = gamma[value[1]]
 
 
# Then it's a trivial matter of writing each column to the SPI port.
print "Displaying..."
while True:
	for x in range(width):
                spidev.write(column[x])
                spidev.flush()
		time.sleep(0.101)
	time.sleep(3.5)

Code: Alles auswählen

while True: