Wearable Computing

Now, we'll make a series of four NeoPixels slowly blink. Copy the following code into the Arduino IDE:

#include <Adafruit_NeoPixel.h>

#define PIN 12 //We'll be using pin D12 to build out our project

#define NUMPIXELS 4 

// Next, we'll tell the board to interact with the NeoPixels, as before

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

// This time, we've added an integer we've named 'delayval'.

  int delayval = 500; // delay for half a second
  void setup() {

      pixels.begin(); // This initializes the NeoPixel library.
      pixels.setBrightness(50);
      pixels.show();
}

// In this loop, we've added a for statement, allowing us to write code for all pixels as opposed to individually
    void loop() {

    for(int i=0; i<NUMPIXELS; i++){
      for(int j=0; j<NUMPIXELS; j++) {
      // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
      pixels.setPixelColor(i, pixels.Color(50,0,50)); 

      pixels.show(); // This sends the updated pixel color to the Flora.

      delay(delayval); // Delay for a period of time (in milliseconds). 

      pixels.setPixelColor(j, pixels.Color(0,0,0));
      pixels.show();
}
}
    }

Next, we'll add a bit more complexity by making NeoPixels cycle through a rainbow. Copy the following code into the Arduino IDE:

#include <Adafruit_NeoPixel.h>


#define PIN 12
#define NUMPIXELS 4

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  pixels.begin();
  pixels.setBrightness(50);
  pixels.show(); // Initialize all pixels to 'off'
}

void loop() {
  rainbow(20);
}

//In the above loop we specified an action named 'rainbow'. This code is outlining what rainbow is. 
void rainbow(int wait) {
  int i, j;

  for(j=0; j<256; j++) {
    for(i=0; i<NUMPIXELS; i++) {
      pixels.setPixelColor(i, Wheel((i+j) & 255));
    }
    pixels.show();
    delay(wait);
  }
}


// Rainbow references 'Wheel' to determine its color. For 'Wheel', this code commands the color specifications.
// The colors are a transition r - g - b - back to r.
int Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
    return pixels.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
    WheelPos -= 85;
    return pixels.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return pixels.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}

NeoPixel Blink and Rainbow code by Andy Boyles Petersen, revised and adapted from Adafruit.