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: DrawingManager.cpp
- Revision:
- 6:8df79fe1afcd
- Parent:
- 5:910909f34907
--- a/DrawingManager.cpp Tue Sep 01 15:53:52 2015 +0000
+++ b/DrawingManager.cpp Thu Sep 03 20:17:23 2015 +0000
@@ -11,6 +11,7 @@
{
pLedStrip = NULL;
isBusy = false;
+ rawFillPayloadOverhangBytes = 0;
}
void DrawingManager::Init(int numLeds, int splitPoint)
@@ -35,10 +36,28 @@
int startLed = GetIntFromNameValPair(args, "start=", -1);
if (startLed != -1 && payloadLen > 0)
{
- int numLeds = payloadLen / 3;
+ // Include any overhang bytes from the last payload
+ int numLeds = (rawFillPayloadOverhangBytes + payloadLen) / 3;
int fromLed = startLed + (payloadOffset / 3);
+ unsigned char newPayload[numLeds*3];
+ memcpy(newPayload, pRawFillPayloadOverhang, rawFillPayloadOverhangBytes);
+ memcpy(newPayload+rawFillPayloadOverhangBytes, payload, numLeds*3-rawFillPayloadOverhangBytes);
+
+ // Send the data
// printf("RAWFILL fromLed %d numLeds %d\r\n", fromLed, numLeds);
- pLedStrip->RawFill(fromLed, numLeds, payload);
+// for (int i = 0; i < numLeds*3; i+=3)
+// {
+// printf("%02x %02x %02x\r\n", newPayload[i], newPayload[i+1], newPayload[i+2]);
+// }
+ pLedStrip->RawFill(fromLed, numLeds, newPayload);
+
+ // Save any overhanging bytes for the next fill
+ int overhangStart = (numLeds * 3) - rawFillPayloadOverhangBytes;
+ rawFillPayloadOverhangBytes = rawFillPayloadOverhangBytes + payloadLen - (numLeds * 3);
+ for (int i = 0; i < rawFillPayloadOverhangBytes; i++)
+ {
+ pRawFillPayloadOverhang[i] = payload[overhangStart + i];
+ }
}
}
@@ -65,6 +84,7 @@
void DrawingManager::ShowLeds()
{
// printf("SHOWLEDS\r\n");
+ rawFillPayloadOverhangBytes = 0;
if (pLedStrip)
pLedStrip->ShowLeds();
}
@@ -77,12 +97,22 @@
if (pLedStrip->IsBusy())
return;
pLedStrip->Clear();
- int ledsPerGroup = pLedStrip->GetNumLeds() / 10;
- for (int i = 0; i < pLedStrip->GetNumLeds(); i += ledsPerGroup)
+ int numSnakes = 15;
+ int ledsPerGroup = pLedStrip->GetNumLeds() / numSnakes;
+ int snakeLen = 10;
+ int snakeStep = stepCount % ledsPerGroup;
+ int colrBase = (stepCount / ledsPerGroup);
+ // Create a set of colourful snakes that roam around the wall
+ for (int i = 0; i < numSnakes; i ++)
{
- RgbColor colrVal((stepCount * 7) + (i * 23) % 64, (stepCount * 17) + 77 + (i * 3) % 64, (stepCount * 37) + 117 + (i * 13) % 64);
- RgbColor colrVal2((stepCount * 17) + (i * 33) % 64, (stepCount * 3) + 13 + (i * 13) % 64, (stepCount * 77) + 11 + (i * 23) % 64);
- pLedStrip->Fill(i,ledsPerGroup,colrVal.r, colrVal.g, colrVal.b, colrVal2.r, colrVal2.g, colrVal2.b);
+ HsvColor hsv1(((colrBase + i) * 237) % 255, 128, 10);
+ RgbColor rgb1(0,0,0);
+ HsvToRgb(hsv1, rgb1);
+ HsvColor hsv2(((colrBase + i + 27) * 13) % 255, 255, 255);
+ RgbColor rgb2(0,0,0);
+ HsvToRgb(hsv2, rgb2);
+ pLedStrip->Fill((i*ledsPerGroup)+snakeStep,snakeLen/2, rgb1.r, rgb1.g, rgb1.b, rgb2.r, rgb2.g, rgb2.b);
+ pLedStrip->Fill((i*ledsPerGroup)+snakeStep+snakeLen/2, snakeLen/2, rgb2.r, rgb2.g, rgb2.b, rgb1.r, rgb1.g, rgb1.b);
}
pLedStrip->ShowLeds();
}