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
diff -r 000000000000 -r 887096209439 colourconverters.cpp --- /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; +}