Rob Dobson
Spidey Wall is the name for a physical wall lit up by multiple addressable LED strips. This program is an LPC1768 web server to control the wall from a browser.
Dependencies: EthernetInterfacePlusHostname RdWebServer mbed-rtos mbed
This project is part of a Light-Wall using addressable LED strips (WS2801). I have published a few posts on my blog about the construction of the wall and building a game to play on it (PacMan). I have also had a guest post from a friend who has set his children the task of producing some interesting animations. The original post is http://robdobson.com/2015/07/spidey-wall/ 
So far, however, I hadn't fully connected the physical (and electronic) wall with the web-browser creations to drive it. This project is hopefully the final link. A fast and reliable web server using REST commands to drive the 1686 LEDs in the Spidey Wall from code running in a browser (say on an iPad while you are playing a game).
The approach taken here results in the ability to control the RGB values of all 1686 LEDs at a rate of 20 frames per second.
A blog post describing the whole thing is here:
http://robdobson.com/2015/08/a-reliable-mbed-webserver/
Diff: colourconverters.cpp
- Revision:
- 0:887096209439
- Child:
- 6:8df79fe1afcd
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/colourconverters.cpp Tue Aug 18 16:03:29 2015 +0000
@@ -0,0 +1,79 @@
+#include "colourconverters.h"
+
+RgbColor HsvToRgb(HsvColor hsv)
+{
+ RgbColor rgb(0,0,0);
+ unsigned char region, remainder, p, q, t;
+
+ if (hsv.s == 0)
+ {
+ rgb.r = hsv.v;
+ rgb.g = hsv.v;
+ rgb.b = hsv.v;
+ return rgb;
+ }
+
+ region = hsv.h / 43;
+ remainder = (hsv.h - (region * 43)) * 6;
+
+ p = (hsv.v * (255 - hsv.s)) >> 8;
+ q = (hsv.v * (255 - ((hsv.s * remainder) >> 8))) >> 8;
+ t = (hsv.v * (255 - ((hsv.s * (255 - remainder)) >> 8))) >> 8;
+
+ switch (region)
+ {
+ case 0:
+ rgb.r = hsv.v; rgb.g = t; rgb.b = p;
+ break;
+ case 1:
+ rgb.r = q; rgb.g = hsv.v; rgb.b = p;
+ break;
+ case 2:
+ rgb.r = p; rgb.g = hsv.v; rgb.b = t;
+ break;
+ case 3:
+ rgb.r = p; rgb.g = q; rgb.b = hsv.v;
+ break;
+ case 4:
+ rgb.r = t; rgb.g = p; rgb.b = hsv.v;
+ break;
+ default:
+ rgb.r = hsv.v; rgb.g = p; rgb.b = q;
+ break;
+ }
+
+ return rgb;
+}
+
+HsvColor RgbToHsv(RgbColor rgb)
+{
+ HsvColor hsv(0,0,0);
+ unsigned char rgbMin, rgbMax;
+
+ rgbMin = rgb.r < rgb.g ? (rgb.r < rgb.b ? rgb.r : rgb.b) : (rgb.g < rgb.b ? rgb.g : rgb.b);
+ rgbMax = rgb.r > rgb.g ? (rgb.r > rgb.b ? rgb.r : rgb.b) : (rgb.g > rgb.b ? rgb.g : rgb.b);
+
+ hsv.v = rgbMax;
+ if (hsv.v == 0)
+ {
+ hsv.h = 0;
+ hsv.s = 0;
+ return hsv;
+ }
+
+ hsv.s = 255 * long(rgbMax - rgbMin) / hsv.v;
+ if (hsv.s == 0)
+ {
+ hsv.h = 0;
+ return hsv;
+ }
+
+ if (rgbMax == rgb.r)
+ hsv.h = 0 + 43 * (rgb.g - rgb.b) / (rgbMax - rgbMin);
+ else if (rgbMax == rgb.g)
+ hsv.h = 85 + 43 * (rgb.b - rgb.r) / (rgbMax - rgbMin);
+ else
+ hsv.h = 171 + 43 * (rgb.r - rgb.g) / (rgbMax - rgbMin);
+
+ return hsv;
+}