ws2801-example.cpp

#include "Adafruit_WS2801/Adafruit_WS2801.h"

/*****************************************************************************
  Example sketch for driving Adafruit WS2801 pixels on the Spark Core!
 
 
  Designed specifically to work with the Adafruit RGB Pixels!
  12mm Bullet shape ----> https://www.adafruit.com/products/322
  12mm Flat shape   ----> https://www.adafruit.com/products/738
  36mm Square shape ----> https://www.adafruit.com/products/683
 
  These pixels use SPI to transmit the color data, and have built in
  high speed PWM drivers for 24 bit color per pixel
  2 pins are required to interface
 
  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!
 
  Written by Limor Fried/Ladyada for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution
 
*****************************************************************************/
 
// The colors of the wires may be totally different so
// BE SURE TO CHECK YOUR PIXELS TO SEE WHICH WIRES TO USE!
 
// SPARK CORE SPI PINOUTS
// http://docs.spark.io/#/firmware/communication-spi
// Spark Core   WS2801
// VIN       -- +5V
// A3 (SCK)  -- Green wire on Adafruit Pixels, CI (Clock Input) on strips
// A5 (MOSI) -- Yellow wire on Adafruit Pixels, DI (Data Input) on strips
// GND       -- GND
 
// Don't forget to connect the ground wire to Arduino ground,
// and the +5V wire to a +5V supply
 
// Set the argument to the NUMBER of pixels. 25 = 25 pixels in a row
Adafruit_WS2801 strip = Adafruit_WS2801(25);
 
// For 36mm LED pixels: these pixels internally represent color in a
// different format.  Either of the above constructors can accept an
// optional extra parameter: WS2801_RGB is conventional RGB order
// WS2801_GRB is the GRB order required by the 36mm pixels.  Other
// than this parameter, your code does not need to do anything different;
// the library will handle the format change.  Example:
//Adafruit_WS2801 strip = Adafruit_WS2801(25, WS2801_GRB);
 
void setup() {
    
  strip.begin();
 
  // Update LED contents, to start they are all 'off'
  strip.show();
}
 
 
void loop() {
  // Some example procedures showing how to display to the pixels
  
  colorWipe(Color(255, 0, 0), 50);
  colorWipe(Color(0, 255, 0), 50);
  colorWipe(Color(0, 0, 255), 50);
  rainbow(20);
  rainbowCycle(20);
}
 
void rainbow(uint8_t wait) {
  int i, j;
   
  for (j=0; j < 256; j++) {     // 3 cycles of all 256 colors in the wheel
    for (i=0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel( (i + j) % 255));
    }  
    strip.show();   // write all the pixels out
    delay(wait);
  }
}
 
// Slightly different, this one makes the rainbow wheel equally distributed 
// along the chain
void rainbowCycle(uint8_t wait) {
  int i, j;
  
  for (j=0; j < 256 * 5; j++) {     // 5 cycles of all 25 colors in the wheel
    for (i=0; i < strip.numPixels(); i++) {
      // tricky math! we use each pixel as a fraction of the full 96-color wheel
      // (thats the i / strip.numPixels() part)
      // Then add in j which makes the colors go around per pixel
      // the % 96 is to make the wheel cycle around
      strip.setPixelColor(i, Wheel( ((i * 256 / strip.numPixels()) + j) % 256) );
    }  
    strip.show();   // write all the pixels out
    delay(wait);
  }
}
 
// fill the dots one after the other with said color
// good for testing purposes
void colorWipe(uint32_t c, uint8_t wait) {
  int i;
  
  for (i=0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, c);
      strip.show();
      delay(wait);
  }
}
 
/* Helper functions */
 
// Create a 24 bit color value from R,G,B
uint32_t Color(byte r, byte g, byte b)
{
  uint32_t c;
  c = r;
  c <<= 8;
  c |= g;
  c <<= 8;
  c |= b;
  return c;
}
 
//Input a value 0 to 255 to get a color value.
//The colours are a transition r - g -b - back to r
uint32_t Wheel(byte WheelPos)
{
  if (WheelPos < 85) {
   return Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  } else if (WheelPos < 170) {
   WheelPos -= 85;
   return Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
   WheelPos -= 170; 
   return Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}