added pin change interupt for chaninging animation state

rainbow_corner.ino

@@ -0,0 +1,75 @@
+/******************************* RAINBOW CORNER *******************************\
+| Found on the internet....                                                    |
+|                                                                              |
+| Modified By: S. Dugre to use asynchronous timer   
+
+ NOT WORKING GOOD.  IT SCREWS UP ANIMATION PROGRESSION 
+\******************************************************************************/
+
+byte spectrum2[24][3] = {
+  {8,0,0},{7,1,0},{6,2,0},{5,3,0},{4,4,0},{3,5,0},{2,6,0},{1,7,0},
+  {0,8,0},{0,7,1},{0,6,2},{0,5,3},{0,4,4},{0,3,5},{0,2,6},{0,1,7},
+  {0,0,8},{1,0,7},{2,0,6},{3,0,5},{4,0,4},{5,0,3},{6,0,2},{7,0,1},
+};
+byte offset    = 0;
+byte shift[3]  = {0,0,0};
+bool mirror[3] = {false,false,false};
+byte anim[8]   = {0,2,0,1,0,2,0,1};
+
+void drawCube() {
+  for (byte x = 0; x <= 3; x++) {
+    for (byte y = 0; y <= 3; y++) {
+      for (byte z = 0; z <= 3; z++) {
+        byte xx = mirror[0] ? 3 - x : x;
+        byte yy = mirror[1] ? 3 - y : y;
+        byte zz = mirror[2] ? 3 - z : z;
+        xx = shift[0] > xx ? 0 : xx - shift[0];
+        yy = shift[1] > yy ? 0 : yy - shift[1];
+        zz = shift[2] > zz ? 0 : zz - shift[2];
+        byte val = (offset + xx + yy + zz) % 24;
+        drawLed(red,  spectrum2[val][0],x,y,z);
+        drawLed(green,spectrum2[val][1],x,y,z);
+        drawLed(blue, spectrum2[val][2],x,y,z);
+      }
+    }
+  }
+  flushBuffer();
+  clearBuffer();
+  offset = offset == 0 ? 23 : offset - 1;
+  //delay(75);  
+  currentTimer = 0;
+}
+
+void moveAxis(byte axis) {
+  for (int n = 1;n <= 3; n++) {
+    shift[axis] = n;
+    drawCube();
+  }
+  mirror[axis] = not mirror[axis];
+  drawCube();
+  for (int n = 2;n >= 0; n--) {
+    shift[axis] = n;
+    drawCube();
+  }
+}
+
+void rainbow_corner() {
+
+  if (currentState != lastState) {
+    
+    lastState = currentState;
+    Serial.print("New State = ");
+    Serial.println(currentState);
+
+    currentTimer = 0;
+    maxTimer = 4687; // 75 ms
+  }
+  
+  if ( timerReset) {  
+    for (byte n = 0;n <= 7;n++) {
+      for (byte m = 0;m < 50;m++) drawCube();
+      moveAxis(anim[n]);
+    }
+    timerReset = false;
+  }  
+}