http://learn.adafruit.com/adalight-diy-ambient-tv-lighting/advanced-topics
problem: ws2801 LED stripes Red<->Blue transposed
some adjustments in code of processing sketch necessary for the colors also for the amount of LEDs (50)
Update
solution:
sketch:
// "Adalight" is a do-it-yourself facsimile of the Philips Ambilight concept
// for desktop computers and home theater PCs. This is the host PC-side code
// written in Processing, intended for use with a USB-connected Arduino
// microcontroller running the accompanying LED streaming code. Requires one
// or more strands of Digital RGB LED Pixels (Adafruit product ID #322,
// specifically the newer WS2801-based type, strand of 25) and a 5 Volt power
// supply (such as Adafruit #276). You may need to adapt the code and the
// hardware arrangement for your specific display configuration.
// Screen capture adapted from code by Cedrik Kiefer (processing.org forum)
// --------------------------------------------------------------------
// This file is part of Adalight.
// Adalight is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
// Adalight is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public
// License along with Adalight. If not, see
// <http://www.gnu.org/licenses/>.
// --------------------------------------------------------------------
import java.awt.*;
import java.awt.image.*;
import processing.serial.*;
// CONFIGURABLE PROGRAM CONSTANTS --------------------------------------------
// Minimum LED brightness; some users prefer a small amount of backlighting
// at all times, regardless of screen content. Higher values are brighter,
// or set to 0 to disable this feature.
static final short minBrightness = 120;
// LED transition speed; it's sometimes distracting if LEDs instantaneously
// track screen contents (such as during bright flashing sequences), so this
// feature enables a gradual fade to each new LED state. Higher numbers yield
// slower transitions (max of 255), or set to 0 to disable this feature
// (immediate transition of all LEDs).
static final short fade = 75;
// Pixel size for the live preview image.
static final int pixelSize = 20;
// Depending on many factors, it may be faster either to capture full
// screens and process only the pixels needed, or to capture multiple
// smaller sub-blocks bounding each region to be processed. Try both,
// look at the reported frame rates in the Processing output console,
// and run with whichever works best for you.
static final boolean useFullScreenCaps = true;
// Serial device timeout (in milliseconds), for locating Arduino device
// running the corresponding LEDstream code. See notes later in the code...
// in some situations you may want to entirely comment out that block.
static final int timeout = 5000; // 5 seconds
// PER-DISPLAY INFORMATION ---------------------------------------------------
// This array contains details for each display that the software will
// process. If you have screen(s) attached that are not among those being
// "Adalighted," they should not be in this list. Each triplet in this
// array represents one display. The first number is the system screen
// number...typically the "primary" display on most systems is identified
// as screen #1, but since arrays are indexed from zero, use 0 to indicate
// the first screen, 1 to indicate the second screen, and so forth. This
// is the ONLY place system screen numbers are used...ANY subsequent
// references to displays are an index into this list, NOT necessarily the
// same as the system screen number. For example, if you have a three-
// screen setup and are illuminating only the third display, use '2' for
// the screen number here...and then, in subsequent section, '0' will be
// used to refer to the first/only display in this list.
// The second and third numbers of each triplet represent the width and
// height of a grid of LED pixels attached to the perimeter of this display.
// For example, '9,6' = 9 LEDs across, 6 LEDs down.
static final int displays[][] = new int[][] {
{0,17,10} // Screen 0, 9 LEDs across, 6 LEDs down
// {0,9,6} // Screen 0, 9 LEDs across, 6 LEDs down
//,{1,9,6} // Screen 1, also 9 LEDs across and 6 LEDs down
};
// PER-LED INFORMATION -------------------------------------------------------
// This array contains the 2D coordinates corresponding to each pixel in the
// LED strand, in the order that they're connected (i.e. the first element
// here belongs to the first LED in the strand, second element is the second
// LED, and so forth). Each triplet in this array consists of a display
// number (an index into the display array above, NOT necessarily the same as
// the system screen number) and an X and Y coordinate specified in the grid
// units given for that display. {0,0,0} is the top-left corner of the first
// display in the array.
// For our example purposes, the coordinate list below forms a ring around
// the perimeter of a single screen, with a one pixel gap at the bottom to
// accommodate a monitor stand. Modify this to match your own setup:
//50LEDs
//falsch aufgeklebt bzgl. Bild 1=1, 50=2, 49=3,...2=50
static final int leds[][] = new int[][] {
// 1 2 3 4 5 6 7 8 9
//{0,8,9}, {0,7,9}, {0,6,9}, {0,5,9}, {0,4,9}, {0,3,9}, {0,2,9}, {0,1,9}, {0,0,9}, // Bottom edge, left half
{0,8,9}, {0,9,9}, {0,10,9},{0,11,9},{0,12,9},{0,13,9},{0,14,9}, {0,15,9},{0,16,9},
// 35 36 37 38 39 40 41 42
//{0,0,8}, {0,0,7}, {0,0,6}, {0,0,5}, {0,0,4}, {0,0,3}, {0,0,2}, {0,0,1}, {0,0,0},
{0,16,8},{0,16,7},{0,16,6}, {0,16,5},{0,16,4},{0,16,3}, {0,16,2},{0,16,1}, // Right edge
//{0,1,0}, {0,2,0}, {0,3,0}, {0,4,0}, {0,5,0}, {0,6,0}, {0,7,0}, {0,8,0}, // Top edge
//{0,9,0}, {0,10,0}, {0,11,0}, {0,12,0}, {0,13,0}, {0,14,0}, {0,15,0}, {0,16,0}, // More top edge
{0,16,0},{0,15,0},{0,14,0},{0,13,0},{0,12,0},{0,11,0},{0,10,0},{0,9,0},
{0,8,0},{0,7,0}, {0,6,0},{0,5,0},{0,4,0},{0,3,0}, {0,2,0}, {0,1,0},
// 10 11 12 13 14 15 16 17 18
//{0,16,1}, {0,16,2}, {0,16,3}, {0,16,4}, {0,16,5}, {0,16,6}, {0,16,7}, {0,16,8}, // Left edge
{0,0,0},{0,0,1},{0,0,2},{0,0,3},{0,0,4},{0,0,5},{0,0,6},{0,0,7},{0,0,8},
// 43 44 45 46 47 48 49 50
//{0,16,9}, {0,15,9}, {0,14,9}, {0,13,9}, {0,12,9}, {0,11,9}, {0,10,9}, {0,9,9}, // Bottom edge, right half
{0,0,9}, {0,1,9},{0,2,9}, {0,3,9},{0,4,9}, {0,5,9},{0,6,9}, {0,7,9},
//50LEDs
//static final int leds[][] = new int[][] {
// 1 2 3 4 5 6 7 8 9
//{0,8,9}, {0,7,9}, {0,6,9}, {0,5,9}, {0,4,9}, {0,3,9}, {0,2,9}, {0,1,9}, {0,0,9}, // Bottom edge, left half
// 10 11 12 13 14 15 16 17 18
//{0,16,1}, {0,16,2}, {0,16,3}, {0,16,4}, {0,16,5}, {0,16,6}, {0,16,7}, {0,16,8}, // Right edge
//{0,1,0}, {0,2,0}, {0,3,0}, {0,4,0}, {0,5,0}, {0,6,0}, {0,7,0}, {0,8,0}, // Top edge
//{0,9,0}, {0,10,0}, {0,11,0}, {0,12,0}, {0,13,0}, {0,14,0}, {0,15,0}, {0,16,0}, // More top edge
// 35 36 37 38 39 40 41 42
//{0,0,8}, {0,0,7}, {0,0,6}, {0,0,5}, {0,0,4}, {0,0,3}, {0,0,2}, {0,0,1}, {0,0,0}, // Left edge
// 43 44 45 46 47 48 49 50
//{0,16,9}, {0,15,9}, {0,14,9}, {0,13,9}, {0,12,9}, {0,11,9}, {0,10,9}, {0,9,9}, // Bottom edge, right half
//25LEDs
//static final int leds[][] = new int[][] {
// {0,3,5}, {0,2,5}, {0,1,5}, {0,0,5}, // Bottom edge, left half
// {0,0,4}, {0,0,3}, {0,0,2}, {0,0,1}, // Left edge
// {0,0,0}, {0,1,0}, {0,2,0}, {0,3,0}, {0,4,0}, // Top edge
// {0,5,0}, {0,6,0}, {0,7,0}, {0,8,0}, // More top edge
// {0,8,1}, {0,8,2}, {0,8,3}, {0,8,4}, // Right edge
// {0,8,5}, {0,7,5}, {0,6,5}, {0,5,5} // Bottom edge, right half
/* Hypothetical second display has the same arrangement as the first.
But you might not want both displays completely ringed with LEDs;
the screens might be positioned where they share an edge in common.
,{1,3,5}, {1,2,5}, {1,1,5}, {1,0,5}, // Bottom edge, left half
{1,0,4}, {1,0,3}, {1,0,2}, {1,0,1}, // Left edge
{1,0,0}, {1,1,0}, {1,2,0}, {1,3,0}, {1,4,0}, // Top edge
{1,5,0}, {1,6,0}, {1,7,0}, {1,8,0}, // More top edge
{1,8,1}, {1,8,2}, {1,8,3}, {1,8,4}, // Right edge
{1,8,5}, {1,7,5}, {1,6,5}, {1,5,5} // Bottom edge, right half
*/
};
// GLOBAL VARIABLES ---- You probably won't need to modify any of this -------
byte[] serialData = new byte[6 + leds.length * 3];
short[][] ledColor = new short[leds.length][3],
prevColor = new short[leds.length][3];
byte[][] gamma = new byte[256][3];
int nDisplays = displays.length;
Robot[] bot = new Robot[displays.length];
Rectangle[] dispBounds = new Rectangle[displays.length],
ledBounds; // Alloc'd only if per-LED captures
int[][] pixelOffset = new int[leds.length][256],
screenData; // Alloc'd only if full-screen captures
PImage[] preview = new PImage[displays.length];
Serial port;
DisposeHandler dh; // For disabling LEDs on exit
// INITIALIZATION ------------------------------------------------------------
void setup() {
GraphicsEnvironment ge;
GraphicsConfiguration[] gc;
GraphicsDevice[] gd;
int d, i, totalWidth, maxHeight, row, col, rowOffset;
int[] x = new int[16], y = new int[16];
float f, range, step, start;
dh = new DisposeHandler(this); // Init DisposeHandler ASAP
// Open serial port. As written here, this assumes the Arduino is the
// first/only serial device on the system. If that's not the case,
// change "Serial.list()[0]" to the name of the port to be used:
port = new Serial(this, Serial.list()[0], 115200);
// Alternately, in certain situations the following line can be used
// to detect the Arduino automatically. But this works ONLY with SOME
// Arduino boards and versions of Processing! This is so convoluted
// to explain, it's easier just to test it yourself and see whether
// it works...if not, leave it commented out and use the prior port-
// opening technique.
// port = openPort();
// And finally, to test the software alone without an Arduino connected,
// don't open a port...just comment out the serial lines above.
// Initialize screen capture code for each display's dimensions.
dispBounds = new Rectangle[displays.length];
if(useFullScreenCaps == true) {
screenData = new int[displays.length][];
// ledBounds[] not used
} else {
ledBounds = new Rectangle[leds.length];
// screenData[][] not used
}
ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
gd = ge.getScreenDevices();
if(nDisplays > gd.length) nDisplays = gd.length;
totalWidth = maxHeight = 0;
for(d=0; d<nDisplays; d++) { // For each display...
try {
bot[d] = new Robot(gd[displays[d][0]]);
}
catch(AWTException e) {
System.out.println("new Robot() failed");
continue;
}
gc = gd[displays[d][0]].getConfigurations();
dispBounds[d] = gc[0].getBounds();
dispBounds[d].x = dispBounds[d].y = 0;
preview[d] = createImage(displays[d][1], displays[d][2], RGB);
preview[d].loadPixels();
totalWidth += displays[d][1];
if(d > 0) totalWidth++;
if(displays[d][2] > maxHeight) maxHeight = displays[d][2];
}
// Precompute locations of every pixel to read when downsampling.
// Saves a bunch of math on each frame, at the expense of a chunk
// of RAM. Number of samples is now fixed at 256; this allows for
// some crazy optimizations in the downsampling code.
for(i=0; i<leds.length; i++) { // For each LED...
d = leds[i][0]; // Corresponding display index
// Precompute columns, rows of each sampled point for this LED
range = (float)dispBounds[d].width / (float)displays[d][1];
step = range / 16.0;
start = range * (float)leds[i][1] + step * 0.5;
for(col=0; col<16; col++) x[col] = (int)(start + step * (float)col);
range = (float)dispBounds[d].height / (float)displays[d][2];
step = range / 16.0;
start = range * (float)leds[i][2] + step * 0.5;
for(row=0; row<16; row++) y[row] = (int)(start + step * (float)row);
if(useFullScreenCaps == true) {
// Get offset to each pixel within full screen capture
for(row=0; row<16; row++) {
for(col=0; col<16; col++) {
pixelOffset[i][row * 16 + col] =
y[row] * dispBounds[d].width + x[col];
}
}
} else {
// Calc min bounding rect for LED, get offset to each pixel within
ledBounds[i] = new Rectangle(x[0], y[0], x[15]-x[0]+1, y[15]-y[0]+1);
for(row=0; row<16; row++) {
for(col=0; col<16; col++) {
pixelOffset[i][row * 16 + col] =
(y[row] - y[0]) * ledBounds[i].width + x[col] - x[0];
}
}
}
}
for(i=0; i<prevColor.length; i++) {
prevColor[i][0] = prevColor[i][1] = prevColor[i][2] =
minBrightness / 3;
}
// Preview window shows all screens side-by-side
size(totalWidth * pixelSize, maxHeight * pixelSize, JAVA2D);
noSmooth();
// A special header / magic word is expected by the corresponding LED
// streaming code running on the Arduino. This only needs to be initialized
// once (not in draw() loop) because the number of LEDs remains constant:
serialData[0] = 'A'; // Magic word
serialData[1] = 'd';
serialData[2] = 'a';
serialData[3] = (byte)((leds.length - 1) >> 8); // LED count high byte
serialData[4] = (byte)((leds.length - 1) & 0xff); // LED count low byte
serialData[5] = (byte)(serialData[3] ^ serialData[4] ^ 0x55); // Checksum
// Pre-compute gamma correction table for LED brightness levels:
for(i=0; i<256; i++) {
f = pow((float)i / 255.0, 2.8);
gamma[i][0] = (byte)(f * 255.0);
gamma[i][1] = (byte)(f * 240.0);
gamma[i][2] = (byte)(f * 220.0);
}
}
// Open and return serial connection to Arduino running LEDstream code. This
// attempts to open and read from each serial device on the system, until the
// matching "Ada\n" acknowledgement string is found. Due to the serial
// timeout, if you have multiple serial devices/ports and the Arduino is late
// in the list, this can take seemingly forever...so if you KNOW the Arduino
// will always be on a specific port (e.g. "COM6"), you might want to comment
// out most of this to bypass the checks and instead just open that port
// directly! (Modify last line in this method with the serial port name.)
Serial openPort() {
String[] ports;
String ack;
int i, start;
Serial s;
ports = Serial.list(); // List of all serial ports/devices on system.
for(i=0; i<ports.length; i++) { // For each serial port...
System.out.format("Trying serial port %s\n",ports[i]);
try {
s = new Serial(this, ports[i], 115200);
}
catch(Exception e) {
// Can't open port, probably in use by other software.
continue;
}
// Port open...watch for acknowledgement string...
start = millis();
while((millis() - start) < timeout) {
if((s.available() >= 4) &&
((ack = s.readString()) != null) &&
ack.contains("Ada\n")) {
return s; // Got it!
}
}
// Connection timed out. Close port and move on to the next.
s.stop();
}
// Didn't locate a device returning the acknowledgment string.
// Maybe it's out there but running the old LEDstream code, which
// didn't have the ACK. Can't say for sure, so we'll take our
// changes with the first/only serial device out there...
return new Serial(this, ports[0], 115200);
}
// PER_FRAME PROCESSING ------------------------------------------------------
void draw () {
BufferedImage img;
int d, i, j, o, c, weight, rb, g, sum, deficit, s2, r, b; //added rb variabeln
int[] pxls, offs;
if(useFullScreenCaps == true ) {
// Capture each screen in the displays array.
for(d=0; d<nDisplays; d++) {
img = bot[d].createScreenCapture(dispBounds[d]);
// Get location of source pixel data
screenData[d] =
((DataBufferInt)img.getRaster().getDataBuffer()).getData();
}
}
weight = 257 - fade; // 'Weighting factor' for new frame vs. old
j = 6; // Serial led data follows header / magic word
// This computes a single pixel value filtered down from a rectangular
// section of the screen. While it would seem tempting to use the native
// image scaling in Processing/Java, in practice this didn't look very
// good -- either too pixelated or too blurry, no happy medium. So
// instead, a "manual" downsampling is done here. In the interest of
// speed, it doesn't actually sample every pixel within a block, just
// a selection of 256 pixels spaced within the block...the results still
// look reasonably smooth and are handled quickly enough for video.
for(i=0; i<leds.length; i++) { // For each LED...
d = leds[i][0]; // Corresponding display index
if(useFullScreenCaps == true) {
// Get location of source data from prior full-screen capture:
pxls = screenData[d];
} else {
// Capture section of screen (LED bounds rect) and locate data::
img = bot[d].createScreenCapture(ledBounds[i]);
pxls = ((DataBufferInt)img.getRaster().getDataBuffer()).getData();
}
offs = pixelOffset[i];
rb = r = g = b= 0; // rgb variablen
for(o=0; o<256; o++) {
c = pxls[offs[o]];
//rb += c & 0x00ff00ff; // Bit trickery: R+B can accumulate in one var
r += c & 0x000000ff; // R with B value
g += c & 0x0000ff00;
b += c & 0x00ff0000; //B with R value
}
// Blend new pixel value with the value from the prior frame
ledColor[i][0] = (short)((((r >> 8) & 0xff) * weight + //8 instead of 24
prevColor[i][0] * fade) >> 8);
ledColor[i][1] = (short)(((( g >> 16) & 0xff) * weight +
prevColor[i][1] * fade) >> 8);
ledColor[i][2] = (short)((((b >> 24) & 0xff) * weight +
prevColor[i][2] * fade) >> 8); //24 instead of 8
// Boost pixels that fall below the minimum brightness
sum = ledColor[i][0] + ledColor[i][1] + ledColor[i][2];
if(sum < minBrightness) {
if(sum == 0) { // To avoid divide-by-zero
deficit = minBrightness / 3; // Spread equally to R,G,B
ledColor[i][0] += deficit;
ledColor[i][1] += deficit;
ledColor[i][2] += deficit;
} else {
deficit = minBrightness - sum;
s2 = sum * 2;
// Spread the "brightness deficit" back into R,G,B in proportion to
// their individual contribition to that deficit. Rather than simply
// boosting all pixels at the low end, this allows deep (but saturated)
// colors to stay saturated...they don't "pink out."
ledColor[i][0] += deficit * (sum - ledColor[i][0]) / s2;
ledColor[i][1] += deficit * (sum - ledColor[i][1]) / s2;
ledColor[i][2] += deficit * (sum - ledColor[i][2]) / s2;
}
}
// Apply gamma curve and place in serial output buffer
serialData[j++] = gamma[ledColor[i][0]][0];
serialData[j++] = gamma[ledColor[i][1]][1];
serialData[j++] = gamma[ledColor[i][2]][2];
// Update pixels in preview image
preview[d].pixels[leds[i][2] * displays[d][1] + leds[i][1]] =
(ledColor[i][0] << 16) | (ledColor[i][1] << 8) | ledColor[i][2];
}
if(port != null) port.write(serialData); // Issue data to Arduino
// Show live preview image(s)
scale(pixelSize);
for(i=d=0; d<nDisplays; d++) {
preview[d].updatePixels();
image(preview[d], i, 0);
i += displays[d][1] + 1;
}
println(frameRate); // How are we doing?
// Copy LED color data to prior frame array for next pass
arraycopy(ledColor, 0, prevColor, 0, ledColor.length);
}
// CLEANUP -------------------------------------------------------------------
// The DisposeHandler is called on program exit (but before the Serial library
// is shutdown), in order to turn off the LEDs (reportedly more reliable than
// stop()). Seems to work for the window close box and escape key exit, but
// not the 'Quit' menu option. Thanks to phi.lho in the Processing forums.
public class DisposeHandler {
DisposeHandler(PApplet pa) {
pa.registerDispose(this);
}
public void dispose() {
// Fill serialData (after header) with 0's, and issue to Arduino...
// Arrays.fill(serialData, 6, serialData.length, (byte)0);
java.util.Arrays.fill(serialData, 6, serialData.length, (byte)0);
if(port != null) port.write(serialData);
}
}
