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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/
colourconverters.cpp@6:8df79fe1afcd, 2015-09-03 (annotated)
- Committer:
- Bobty
- Date:
- Thu Sep 03 20:17:23 2015 +0000
- Revision:
- 6:8df79fe1afcd
- Parent:
- 0:887096209439
Fixed an unforeseen problem with messages not aligned on RGB boundaries; Fixed potential hanging pointer problem in colourconverters; Changed Idle screen to a set of colourful snakes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Bobty | 0:887096209439 | 1 | #include "colourconverters.h" |
Bobty | 0:887096209439 | 2 | |
Bobty | 6:8df79fe1afcd | 3 | void HsvToRgb(HsvColor hsv, RgbColor& rgb) |
Bobty | 0:887096209439 | 4 | { |
Bobty | 0:887096209439 | 5 | unsigned char region, remainder, p, q, t; |
Bobty | 0:887096209439 | 6 | |
Bobty | 0:887096209439 | 7 | if (hsv.s == 0) |
Bobty | 0:887096209439 | 8 | { |
Bobty | 0:887096209439 | 9 | rgb.r = hsv.v; |
Bobty | 0:887096209439 | 10 | rgb.g = hsv.v; |
Bobty | 0:887096209439 | 11 | rgb.b = hsv.v; |
Bobty | 6:8df79fe1afcd | 12 | return; |
Bobty | 0:887096209439 | 13 | } |
Bobty | 0:887096209439 | 14 | |
Bobty | 0:887096209439 | 15 | region = hsv.h / 43; |
Bobty | 0:887096209439 | 16 | remainder = (hsv.h - (region * 43)) * 6; |
Bobty | 0:887096209439 | 17 | |
Bobty | 0:887096209439 | 18 | p = (hsv.v * (255 - hsv.s)) >> 8; |
Bobty | 0:887096209439 | 19 | q = (hsv.v * (255 - ((hsv.s * remainder) >> 8))) >> 8; |
Bobty | 0:887096209439 | 20 | t = (hsv.v * (255 - ((hsv.s * (255 - remainder)) >> 8))) >> 8; |
Bobty | 0:887096209439 | 21 | |
Bobty | 0:887096209439 | 22 | switch (region) |
Bobty | 0:887096209439 | 23 | { |
Bobty | 0:887096209439 | 24 | case 0: |
Bobty | 0:887096209439 | 25 | rgb.r = hsv.v; rgb.g = t; rgb.b = p; |
Bobty | 0:887096209439 | 26 | break; |
Bobty | 0:887096209439 | 27 | case 1: |
Bobty | 0:887096209439 | 28 | rgb.r = q; rgb.g = hsv.v; rgb.b = p; |
Bobty | 0:887096209439 | 29 | break; |
Bobty | 0:887096209439 | 30 | case 2: |
Bobty | 0:887096209439 | 31 | rgb.r = p; rgb.g = hsv.v; rgb.b = t; |
Bobty | 0:887096209439 | 32 | break; |
Bobty | 0:887096209439 | 33 | case 3: |
Bobty | 0:887096209439 | 34 | rgb.r = p; rgb.g = q; rgb.b = hsv.v; |
Bobty | 0:887096209439 | 35 | break; |
Bobty | 0:887096209439 | 36 | case 4: |
Bobty | 0:887096209439 | 37 | rgb.r = t; rgb.g = p; rgb.b = hsv.v; |
Bobty | 0:887096209439 | 38 | break; |
Bobty | 0:887096209439 | 39 | default: |
Bobty | 0:887096209439 | 40 | rgb.r = hsv.v; rgb.g = p; rgb.b = q; |
Bobty | 0:887096209439 | 41 | break; |
Bobty | 0:887096209439 | 42 | } |
Bobty | 0:887096209439 | 43 | } |
Bobty | 0:887096209439 | 44 | |
Bobty | 6:8df79fe1afcd | 45 | void RgbToHsv(RgbColor rgb, HsvColor& hsv) |
Bobty | 0:887096209439 | 46 | { |
Bobty | 0:887096209439 | 47 | unsigned char rgbMin, rgbMax; |
Bobty | 0:887096209439 | 48 | |
Bobty | 0:887096209439 | 49 | rgbMin = rgb.r < rgb.g ? (rgb.r < rgb.b ? rgb.r : rgb.b) : (rgb.g < rgb.b ? rgb.g : rgb.b); |
Bobty | 0:887096209439 | 50 | rgbMax = rgb.r > rgb.g ? (rgb.r > rgb.b ? rgb.r : rgb.b) : (rgb.g > rgb.b ? rgb.g : rgb.b); |
Bobty | 0:887096209439 | 51 | |
Bobty | 0:887096209439 | 52 | hsv.v = rgbMax; |
Bobty | 0:887096209439 | 53 | if (hsv.v == 0) |
Bobty | 0:887096209439 | 54 | { |
Bobty | 0:887096209439 | 55 | hsv.h = 0; |
Bobty | 0:887096209439 | 56 | hsv.s = 0; |
Bobty | 6:8df79fe1afcd | 57 | return; |
Bobty | 0:887096209439 | 58 | } |
Bobty | 0:887096209439 | 59 | |
Bobty | 0:887096209439 | 60 | hsv.s = 255 * long(rgbMax - rgbMin) / hsv.v; |
Bobty | 0:887096209439 | 61 | if (hsv.s == 0) |
Bobty | 0:887096209439 | 62 | { |
Bobty | 0:887096209439 | 63 | hsv.h = 0; |
Bobty | 6:8df79fe1afcd | 64 | return; |
Bobty | 0:887096209439 | 65 | } |
Bobty | 0:887096209439 | 66 | |
Bobty | 0:887096209439 | 67 | if (rgbMax == rgb.r) |
Bobty | 0:887096209439 | 68 | hsv.h = 0 + 43 * (rgb.g - rgb.b) / (rgbMax - rgbMin); |
Bobty | 0:887096209439 | 69 | else if (rgbMax == rgb.g) |
Bobty | 0:887096209439 | 70 | hsv.h = 85 + 43 * (rgb.b - rgb.r) / (rgbMax - rgbMin); |
Bobty | 0:887096209439 | 71 | else |
Bobty | 0:887096209439 | 72 | hsv.h = 171 + 43 * (rgb.r - rgb.g) / (rgbMax - rgbMin); |
Bobty | 0:887096209439 | 73 | } |