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Код для голосового модуля:
int redPin = 11; // R petal on RGB LED module connected to digital pin 11
int greenPin = 9; // G petal on RGB LED module connected to digital pin 9
int bluePin = 10; // B petal on RGB LED module connected to digital pin 10
byte com = 0; //reply from voice recognition

void setup() 
{ 
Serial.begin(9600);

pinMode(redPin, OUTPUT); // sets the redPin to be an output
pinMode(greenPin, OUTPUT); // sets the greenPin to be an output
pinMode(bluePin, OUTPUT); // sets the bluePin to be an output
delay(2000);
Serial.write(0xAA);
Serial.write(0x37);
delay(1000);
Serial.write(0xAA);
Serial.write(0x21);
}

void loop() // run over and over again
{

while(Serial.available())
{
com = Serial.read();
switch(com)
{
case 0x11:
color(255,255,255); // turn RGB LED on -- white
break;

case 0x12:
color(255, 0, 0); // turn the RGB LED red
break;

case 0x13:
color(0,255, 0); // turn the RGB LED green
break;

case 0x14:
color(0, 0, 255); // turn the RGB LED blue
break;

case 0x15:
color(0,0,0); // turn the RGB LED off
break;

}
}

}

void color (unsigned char red, unsigned char green, unsigned char blue) // the color generating function
{ 
analogWrite(redPin, red*102/255); 
analogWrite(bluePin, blue*173/255);
analogWrite(greenPin, green*173/255);
}





#include "SPI.h"
#include "Adafruit_WS2801.h"


int light_data  = 2;    // Yellow wire on Adafruit Pixels
int light_clk = 3;    // Green wire on Adafruit Pixels


WS2801 strip = WS2801(20, light_data, light_clk);

void setup() 
{
    // Initialize Serial Connection (for debugging)
    Serial.begin(9600);
    
    //Initialize strip
  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);
  }
}

примерно так:

#include <SPI.h>
#include <Adafruit_WS2801.h>


int light_data  = 2;    // Yellow wire on Adafruit Pixels
int light_clk = 3;    // Green wire on Adafruit Pixels

Adafruit_WS2801 strip = Adafruit_WS2801(20, light_data, light_clk);

//Код для голосового модуля:
/*
int redPin = 11; // R petal on RGB LED module connected to digital pin 11
int greenPin = 9; // G petal on RGB LED module connected to digital pin 9
int bluePin = 10; // B petal on RGB LED module connected to digital pin 10
*/
byte com = 0; //reply from voice recognition


/*void color (unsigned char red, unsigned char green, unsigned char blue) // the color generating function
{ 
analogWrite(redPin, red*102/255); 
analogWrite(bluePin, blue*173/255);
analogWrite(greenPin, green*173/255);
}
*/






void setup() 
{ 
Serial.begin(9600);

//pinMode(redPin, OUTPUT); // sets the redPin to be an output
//pinMode(greenPin, OUTPUT); // sets the greenPin to be an output
//pinMode(bluePin, OUTPUT); // sets the bluePin to be an output

delay(2000);
Serial.write(0xAA);
Serial.write(0x37);
delay(1000);
Serial.write(0xAA);
Serial.write(0x21);

///
    //Initialize strip
  strip.begin();
  // Update LED contents, to start they are all 'off'
  strip.show();


}



/////////////

void loop() // run over and over again
{


while(Serial.available())
{
com = Serial.read();
switch(com)
{
case 0x11:
//color(255,255,255); // turn RGB LED on -- white
  rainbow(20);
  rainbowCycle(20);

break;

case 0x12:
  colorWipe(Color(255, 0, 0), 50);
//color(255, 0, 0); // turn the RGB LED red
break;

case 0x13:
  colorWipe(Color(0, 255, 0), 50);
//color(0,255, 0); // turn the RGB LED green
break;

case 0x14:
  colorWipe(Color(0, 0, 255), 50);
//color(0, 0, 255); // turn the RGB LED blue
break;

case 0x15:
//color(0,0,0); // turn the RGB LED off
break;

}
}

}



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);
  }
}

вашу библиотеку adafruit не нашел, использовал эту:

http://learn.adafruit.com/12mm-led-pixels/code

#include <SPI.h>
#include <Adafruit_WS2801.h>

/*
int redPin = 11; // R petal on RGB LED module connected to digital pin 11
int greenPin = 9; // G petal on RGB LED module connected to digital pin 9
int bluePin = 10; // B petal on RGB LED module connected to digital pin 10
*/

Эту часть он видит как комментарий, её так и оставлять?

да, это теперь не нужно. это из примера к голосовой плате для включения светодиодов, теперь должны "пиксели" включаться

Включаются, спасибо.  но правда в разнобой. Проверю заново запись команд.

на белый повесил радугу.

цвета вроде правильно должны включаться, но с библиотекой не разбирался, может там порядок rgb перепутан.

код "0x15" - не задействован

А как сделать цвет пульсирующим. К примеру красный, который просто загорается во всю длину... Быстрее, медленее ?

примерно так:

void loop() {
redFlash(10) ;
}



void redFlash(uint8_t wait) {

for(int b=1;b<255;b++){
showColor(Color(b,0,0),wait);
}
for(int b=254;b>0;b--){
showColor(Color(b,0,0),wait);
}

}

void showColor(uint32_t c, uint8_t wait){

for (int i=0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, c);
  }
strip.show();
delay(wait);
}



// 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;
}