flora sparkle skirt

Flora_Sparkle_Skirt/README.md

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+# Flora Sparkle Skirt
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/sparkle-skirt/

Flora_Sparkle_Skirt/sparkle_skirt/sparkle_skirt.ino

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+#include <Wire.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_LSM303_U.h>
+#include <Adafruit_NeoPixel.h>
+
+// Parameter 1 = number of pixels in strip
+// Parameter 2 = pin number (most are valid)
+// Parameter 3 = pixel type flags, add together as needed:
+//   NEO_RGB     Pixels are wired for RGB bitstream
+//   NEO_GRB     Pixels are wired for GRB bitstream
+//   NEO_KHZ400  400 KHz bitstream (e.g. FLORA pixels)
+//   NEO_KHZ800  800 KHz bitstream (e.g. High Density LED strip)
+Adafruit_NeoPixel strip = Adafruit_NeoPixel(6, 6, NEO_GRB + NEO_KHZ800);
+Adafruit_LSM303_Accel_Unified accel = Adafruit_LSM303_Accel_Unified(54321);
+
+// Here is where you can put in your favorite colors that will appear!
+// just add new {nnn, nnn, nnn}, lines. They will be picked out randomly
+//                                  R   G   B
+uint8_t myFavoriteColors[][3] = {{200,   0, 200},   // purple
+                                 {200,   0,   0},   // red 
+                                 {200, 200, 200},   // white
+                               };
+// don't edit the line below
+#define FAVCOLORS sizeof(myFavoriteColors) / 3
+
+// mess with this number to adjust TWINklitude :)
+// lower number = more sensitive
+#define MOVE_THRESHOLD 45
+
+void setup() 
+{
+  Serial.begin(9600);
+  
+  // Try to initialise and warn if we couldn't detect the chip
+  if (!accel.begin())
+  {
+    Serial.println("Oops ... unable to initialize the LSM303. Check your wiring!");
+    while (1);
+  }
+  strip.begin();
+  strip.show(); // Initialize all pixels to 'off'
+}
+
+void loop() 
+{
+  /* Get a new sensor event */ 
+  sensors_event_t event; 
+  accel.getEvent(&event);
+  Serial.print("Accel X: "); Serial.print(event.acceleration.x); Serial.print(" ");
+  Serial.print("Y: "); Serial.print(event.acceleration.y);       Serial.print(" ");
+  Serial.print("Z: "); Serial.print(event.acceleration.z);     Serial.print(" ");
+
+  // Get the magnitude (length) of the 3 axis vector
+  // http://en.wikipedia.org/wiki/Euclidean_vector#Length
+  double storedVector = event.acceleration.x*event.acceleration.x;
+  storedVector += event.acceleration.y*event.acceleration.y;
+  storedVector += event.acceleration.z*event.acceleration.z;
+  storedVector = sqrt(storedVector);
+  Serial.print("Len: "); Serial.println(storedVector);
+  
+  // wait a bit
+  delay(100);
+  
+  // get new data!
+  accel.getEvent(&event);
+  double newVector = event.acceleration.x*event.acceleration.x;
+  newVector += event.acceleration.y*event.acceleration.y;
+  newVector += event.acceleration.z*event.acceleration.z;
+  newVector = sqrt(newVector);
+  Serial.print("New Len: "); Serial.println(newVector);
+  
+  // are we moving 
+  if (abs(newVector - storedVector) > MOVE_THRESHOLD) {
+    Serial.println("Twinkle!");
+    flashRandom(5, 1);  // first number is 'wait' delay, shorter num == shorter twinkle
+    flashRandom(5, 3);  // second number is how many neopixels to simultaneously light up
+    flashRandom(5, 2);
+  }
+}
+
+void flashRandom(int wait, uint8_t howmany) {
+
+  for(uint16_t i=0; i<howmany; i++) {
+    // pick a random favorite color!
+    int c = random(FAVCOLORS);
+    int red = myFavoriteColors[c][0];
+    int green = myFavoriteColors[c][1];
+    int blue = myFavoriteColors[c][2]; 
+
+    // get a random pixel from the list
+    int j = random(strip.numPixels());
+    //Serial.print("Lighting up "); Serial.println(j); 
+    
+    // now we will 'fade' it in 5 steps
+    for (int x=0; x < 5; x++) {
+      int r = red * (x+1); r /= 5;
+      int g = green * (x+1); g /= 5;
+      int b = blue * (x+1); b /= 5;
+      
+      strip.setPixelColor(j, strip.Color(r, g, b));
+      strip.show();
+      delay(wait);
+    }
+    // & fade out in 5 steps
+    for (int x=5; x >= 0; x--) {
+      int r = red * x; r /= 5;
+      int g = green * x; g /= 5;
+      int b = blue * x; b /= 5;
+      
+      strip.setPixelColor(j, strip.Color(r, g, b));
+      strip.show();
+      delay(wait);
+    }
+  }
+  // LEDs will be off when done (they are faded to 0)
+}