adds example and test program for mixing colors via serial communication

examples/serial-color-mixer/serial-color-mixer.ino

+#include "rgbw-strip-12bit.h"
+
+// one block has 6 LEDs
+#define NUM_STRIP_BLOCKS 1
+
+#define DIN 5
+#define CLK 6
+#define LAT 7
+#define BLK 8  // set to -1 to if not used (can be pulled to GND manually)
+
+RgbwStrip12bit strip = RgbwStrip12bit(NUM_STRIP_BLOCKS, CLK, DIN, LAT, BLK);
+
+void setup() {
+	Serial.begin(115200);
+
+	Serial.println("12bit RGBW serial color mixer [up, down]: [r,e] red, [g,f] green, [b,v] blue, [w,q] white. Shift for factor 10.");
+	strip.begin();
+}
+
+int r = 20;
+int g = 20;
+int b = 20;
+int w = 20;
+  
+void loop() {
+  if (Serial.available()) {
+    char input = Serial.read();
+
+    switch (input) {
+      case 'r': r++; break;
+      case 'e': r--; break;
+      case 'g': g++; break;
+      case 'f': g--; break;
+      case 'b': b++; break;
+      case 'v': b--; break;
+      case 'w': w++; break;
+      case 'q': w--; break;
+      case 'R': r += 10; break;
+      case 'E': r -= 10; break;
+      case 'G': g += 10; break;
+      case 'F': g -= 10; break;
+      case 'B': b += 10; break;
+      case 'V': b -= 10; break;
+      case 'W': w += 10; break;
+      case 'Q': w -= 10; break;
+    }
+
+    if (r >= 4096) r = 0;
+    if (r <= -1) r = 4095;
+    if (g >= 4096) g = 0;
+    if (g <= -1) g = 4095;
+    if (b >= 4096) b = 0;
+    if (b <= -1) b = 4095;
+    if (w >= 4096) w = 0;
+    if (w <= -1) w = 4095;
+
+    char out[34];
+    sprintf(out, "r: %4d, g: %4d, b: %4d, w: %4d", r, g, b, w);
+    Serial.println(out);
+  }
+
+  for (int i = 0; i < 6; i++) {
+	  strip.setLED(i, r, g, b, w);
+  }
+  strip.write();
+  delay(10);
+}
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