LPD8806 PIR Interrupt

LPD8806_PIR_Interrupt.ino

#include "LPD8806.h"
#include "SPI.h"

int dataPin = 2;   
int clockPin = 3;
int pirPin = 7; //digital 7
int stripSpeed = 10;
int pirVal 	= 0;	// PIR sensor

LPD8806 strip = LPD8806(32, dataPin, clockPin);

void setup() {
  Serial.begin(9600);
  strip.begin();
  strip.show();		// write all the pixels out
  pinMode(pirPin, INPUT);
}

void loop() {
  pirVal = digitalRead(pirPin);
  Serial.println(pirVal);

  switch (pirVal) {
  case LOW:                    
    strip.show();              // write all the pixels out
    rainbowCycle(stripSpeed);  // make it go through the cycle fairly fast
    break;

  case HIGH:                                     
    strip.show();                                // write all the pixels out
    colorWipe(strip.Color(127,0,0), stripSpeed); // red
    break;
  } 
}

//-------------------------------------------
void rainbowCycle(uint8_t wait) {
  uint16_t i, j;

  for (j=0; j < 384 * 5; j++) {     // 5 cycles of all 384 colors in the wheel
    for (i=0; i < strip.numPixels(); i++) {
      // tricky math! we use each pixel as a fraction of the full 384-color wheel
      // (thats the i / strip.numPixels() part)
      // Then add in j which makes the colors go around per pixel
      // the % 384 is to make the wheel cycle around
      strip.setPixelColor(i, Wheel( ((i * 384 / strip.numPixels()) + j) % 384) );
    }  
    strip.show();   // write all the pixels out
    
  switch (pirVal) {
    case LOW: 
      delay(wait);  
      break;

    case HIGH:
      delay(0);      
      break;
    }  
  }

}

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 */
//Input a value 0 to 384 to get a color value.
//The colours are a transition r - g -b - back to r

uint32_t Wheel(uint16_t WheelPos) {
  byte r, g, b;
  switch(WheelPos / 128) {
  case 0:
    r = 127 - WheelPos % 128;   //Red down
    g = WheelPos % 128;      // Green up
    b = 0;                  //blue off
    break; 
  case 1:
    g = 127 - WheelPos % 128;  //green down
    b = WheelPos % 128;      //blue up
    r = 0;                  //red off
    break; 
  case 2:
    b = 127 - WheelPos % 128;  //blue down 
    r = WheelPos % 128;      //red up
    g = 0;                  //green off
    break; 
  }
  return(strip.Color(r,g,b));
}