kriegsman

/* Generate HTML page in C -- my first REAL Web App */
/* Mark Kriegsman, January 31, 2007 */

#define HTML_ENTITY(n,v) int n = v
HTML_ENTITY(gt,'>');
HTML_ENTITY(lt,'<');
HTML_ENTITY(P,'\n');
HTML_ENTITY(HTML,'\0');

kriegsman

#include<FastLED.h>

// Red, White, and Blue stripes with "glitter" flashes
// Mark Kriegsman, June 30, 2014
// requires FastLED v2.1 or later

#define NUM_LEDS    30
#define LED_PIN     5
#define COLOR_ORDER GRB
#define BRIGHTNESS  64

kriegsman

EXPLANTION: This table shows the total light output for FastLED v2.1's "hsv2rgb_rainbow" function 
for a variety of hue, saturation, and value inputs.  
Each cell shows the sum of the Red, Green, and Blue values returned from the HSV-to-RGB conversion, 
which we could call the 'total numeric light output' for that RGB color.

FINDINGS: For any given saturation and value, the 'total numeric light output' is basically constant 
across all hues +/-1, with the exception of yellow and the hues near yellow, which have higher 
power output -- by design.

NEXT: A question remains though: does "252,0,0" _appear_ brighter or dimmer than "126,126,0", 

kriegsman

hsv2rgb_spectrum 'total numeric light output' across hues, saturations, and values.
(Same as hsv2rgb_raw, but with hues 0..255, instead of 0..191)
Each cell represents the total of R+G+B for the output of the hsv2rb conversion.

Findings: 'total numeric light output' is constant across all hues, +/-1.
N.B. this was, in fact, one of the target design paramaters of this algorithm.

Remaining open question: does 252,0,0 appear exactly as bright, or brighter, or
dimmer than 126,126,0 or 84,84,84, even though they all have the same 'total
numeric light output'.

kriegsman

hsv2rgb_raw_kasper 'total numeric light output' data.

This data is somewhat similar to the output of traditional hsv2rgb 
algorithms, such as the one described on wikipedia, or Adafruit's 
color "wheel" function.  In this model, blended hues requiring a mix 
of LEDs (e.g, aqua, hue=96, output=510) output almost twice as much 
light as primary hues that use just one LED, (e.g. blue, hue=128, 
output=255).  This can result in the blended hues appearing brighter 
than primary hues.  In the case of Aqua, this algorithm turns the 
Green LED on to 254 AND the Blue LED on to 254: two LEDs on at full power.  

kriegsman

#include <FastLED.h>
// Use Version 2.1 or later https://github.com/FastLED/FastLED/tree/FastLED2.1
// ZIP file https://github.com/FastLED/FastLED/archive/FastLED2.1.zip

// RGB Shades data output to LEDs on pin 5
#define LED_PIN  5

// RGB Shades color order 
#define COLOR_ORDER GRB
#define CHIPSET     WS2811

kriegsman

0008-d150:  da fe d1 fe-d2 fe cb fe-c8 fe c2 fe-bf fe ba fe  ........ ........
0008-d160:  b6 fe b3 fe-ac fe aa fe-a4 fe 9f fe-9d fe 97 fe  ........ ........
0008-d170:  92 fe 8f fe-89 fe 85 fe-80 fe 7c fe-77 fe 73 fe  ........ ..|.w.s.
0008-d180:  6d fe 69 fe-65 fe 5e fe-5c fe 55 fe-51 fe 4f fe  m.i.e.^. \.U.Q.O.
0008-d190:  43 fe 46 fe-3b fe 3b fe-33 fe 2e fe-2c fe 22 fe  C.F.;.;. 3...,.".
0008-d1a0:  23 fe 18 fe-19 fe 0e fe-0e fe 06 fe-00 fe 01 fe  #....... ........
0008-d1b0:  f2 fd f8 fd-e8 fd ec fd-e0 fd e0 fd-d7 fd d4 fd  ........ ........
0008-d1c0:  cd fd ca fd-c3 fd be fd-b9 fd b4 fd-ae fd aa fd  ........ ........
0008-d1d0:  a3 fd 9f fd-99 fd 93 fd-90 fd 87 fd-85 fd 7e fd  ........ ......~.
0008-d1e0:  79 fd 73 fd-6e fd 69 fd-62 fd 60 fd-56 fd 54 fd  y.s.n.i. b.`.V.T.

kriegsman

#include <float.h>
#include <stdio.h>
#include <string.h>

// Output from gcc on Intel x64, all default settings:                                                                                
// - float's can be up to 46 characters in %f output,                                                                            
// - double's can be up to 316 characters in %lf output.                                                                         
//                                                                                                                               
//                                                                                                                               
//   printf("%f",  FLT_MAX) = 340282346638528859811704183484516925440.000000, (46 chars)                                         

kriegsman

#include <SmartMatrix.h>
#include <FastLED.h>

const uint8_t kMatrixWidth  = 32;
const uint8_t kMatrixHeight = 32;
const uint8_t kBorderWidth = 2;

#define NUM_LEDS    (kMatrixWidth*kMatrixHeight)
CRGB leds[NUM_LEDS];

kriegsman

#include <FastLED.h>

#define LED_PIN  6
#define LED_TYPE WS2811
#define COLOR_ORDER GRB

const uint8_t kSquareWidth = 8;
const uint8_t kBorderWidth = 1;

#define NUM_LEDS    (kSquareWidth*kSquareWidth)