Zhenxuan’s week5 homework

#include <Adafruit_NeoPixel.h>

#define PIN 6

#define NUM_LEDS 4

#define BRIGHTNESS 5

// Parameter 1 = number of pixels in strip

// Parameter 2 = pin number (most are valid)

// Parameter 3 = pixel type flags, add together as needed:

//   NEO_RGB     Pixels are wired for RGB bitstream

//   NEO_GRB     Pixels are wired for GRB bitstream, correct if colors are swapped upon testing

//   NEO_RGBW    Pixels are wired for RGBW bitstream

//   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 strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRBW + NEO_KHZ800);

void setup() {

  strip.setBrightness(BRIGHTNESS);

  strip.begin();

  strip.show(); // Initialize all pixels to ‘off’

}

void loop() {

  // Some example procedures showing how to display to the pixels:

  colorWipe(strip.Color(255, 0, 0), 50); // Red

  colorWipe(strip.Color(0, 255, 0), 50); // Green

  colorWipe(strip.Color(0, 0, 255), 50); // Blue

  colorWipe(strip.Color(0, 0, 0, 255), 50); // White

  pulseWhite(5); 

  // fullWhite();

  // delay(2000);

}

// Fill the dots one after the other with a color

void colorWipe(uint32_t c, uint8_t wait) {

  for(uint16_t i=0; i<strip.numPixels(); i++) {

    strip.setPixelColor(i, c);

    strip.show();

    delay(wait);

  }

}

void pulseWhite(uint8_t wait) {

  for(int j = 0; j < 256 ; j++){

      for(uint16_t i=0; i<strip.numPixels(); i++) {

          strip.setPixelColor(i, strip.Color(0,0,0, j ) );

        }

        delay(wait);

        strip.show();

      }

  for(int j = 255; j >= 0 ; j–){

      for(uint16_t i=0; i<strip.numPixels(); i++) {

          strip.setPixelColor(i, strip.Color(0,0,255, j ) );

        }

        delay(wait);

        strip.show();

      }

}

// 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) {

  WheelPos = 255 – WheelPos;

  if(WheelPos < 85) {

    return strip.Color(255 – WheelPos * 3, 0, WheelPos * 3,0);

  }

  if(WheelPos < 170) {

    WheelPos -= 85;

    return strip.Color(0, WheelPos * 3, 255 – WheelPos * 3,0);

  }

  WheelPos -= 170;

  return strip.Color(WheelPos * 3, 255 – WheelPos * 3, 0,0);

}

uint8_t red(uint32_t c) {

  return (c >> 8);

}

uint8_t green(uint32_t c) {

  return (c >> 16);

}

uint8_t blue(uint32_t c) {

  return (c);

}

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