//Luke Woodbury 4/11/15 dotLib.org
//Use Piezo as pressure sensor inside squashy foam filled bag
//to trigger colour change in LED animation
//Code based on:
// - NeoPixie Dust Bag by John Edgar Park jpixl.net
// - Adafruit GEMMA earring code and Adafruit NeoPixel buttoncycler code
// - Arduino knock sensor example



#include <Adafruit_NeoPixel.h>  //Include the NeoPixel library

#define NEO_PIN 1        // DIGITAL IO pin for NeoPixel OUTPUT from GEMMA
#define PIXEL_COUNT 4   // Number of NeoPixels connected to GEMMA
#define DELAY_MILLIS 10  // delay between blinks, smaller numbers are faster 
#define DELAY_MULT 8     // Randomization multiplier on the delay speed of the effect
#define BRIGHT 100        // Brightness of the pixels, max is 255

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number on Arduino (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_GRB     Pixels are wired for GRB bitstream, correct for neopixel stick (most NeoPixel products)
//   NEO_KHZ400  400 KHz bitstream (e.g. FLORA pixels)
//   NEO_KHZ800  800 KHz bitstream (e.g. High Density LED strip), correct for neopixel stick
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(PIXEL_COUNT, NEO_PIN, NEO_GRB + NEO_KHZ800);

//Piezo bits
#define knockSensor 1 // the piezo is connected to analog pin 1
const int threshold = 50;  // threshold value to decide when the detected sound is a knock or not
int sensorReading = 0;      // variable to store the value read from the sensor pin

int showColor = 0;    //color mode for cycling

void setup() {
  pixels.begin();
  pixels.setBrightness(BRIGHT);
  pixels.show();                //Set all pixels to "off"

  //pinMode(knockSensor, INPUT);
}


void loop() {
   
  int RColor = 100; //color (0-255) values to be set by cylcing touch switch, initially GOLD
  int GColor = 0 ;
  int BColor = 0 ;
  
       if (showColor==0) {//Garden PINK
         RColor = 242;
         GColor = 90;
         BColor = 255; 
       }
       if (showColor==1) {//Pixie GOLD
         RColor = 255;
         GColor = 222;
         BColor = 30; 
       }
       if (showColor==2) {//Alchemy BLUE
         RColor = 50;
         GColor = 255;
         BColor = 255; 
       }
       if (showColor==3) {//Animal ORANGE
         RColor = 255;
         GColor = 100;
         BColor = 0; 
       }
       if (showColor==4) {//Tinker GREEN
         RColor = 0;
         GColor = 255;
         BColor = 40; 
       }
  
  //sparkling
  int p = random(PIXEL_COUNT); //select a random pixel
  pixels.setPixelColor(p,RColor,GColor,BColor); //color value comes from cycling state of momentary switch
  pixels.show();
  delay(DELAY_MILLIS * random(DELAY_MULT) ); //delay value randomized to up to DELAY_MULT times longer
  pixels.setPixelColor(p, RColor/10, GColor/10, BColor/10); //set to a dimmed version of the state color
  pixels.show();
  pixels.setPixelColor(p+1, RColor/15, GColor/15, BColor/15); //set a neighbor pixel to an even dimmer value
  pixels.show();

  //piezo check
   // read the sensor and store it in the variable sensorReading:
  sensorReading = analogRead(knockSensor);

  // if the sensor reading is greater than the threshold:
  if (sensorReading >= threshold) {
      showColor++;
      if (showColor > 4)
        showColor=0;
       }   
  }