gistfile1.ino

#include <WS2812.h>

#define outputPin 13  // Digital output pin (default: 7)
#define LEDCount 50   // Number of LEDs to drive (default: 9)

WS2812 LED(LEDCount);
cRGB value;
cRGB previousValue;

byte base_r = 80;
byte base_g = 80;
byte base_b = 0;

byte p = random(50);
byte previous_position = 0;

long loopc = 0;

void setup() {
  LED.setOutput(outputPin); // Digital Pin 7

  /* You may uncomment one of the following three lines to switch
  to a different data transmission sequence for your addressable LEDs.
  (These functions can be used at any point in your program as needed.)   */

  LED.setColorOrderRGB();  // Uncomment for RGB color order

  refresh();
}


void refresh() {
  byte i = 0;
  while (i < LEDCount) {
    if ((i % 2) == 0) {
      value.b = 0;
      value.g = base_g;
      value.r = 0;
    } else {
      value.b = 0;
      value.g = 0;
      value.r = base_r; 
    }

    LED.set_crgb_at(i, value); // Set value at LED found at index i
    i++;
  }

  LED.sync(); // Sends the data to the LEDs
}


void blink() {  
  p = random(50);  
  previousValue = LED.get_crgb_at(p);
  
  value.b = 255;
  value.g = 255;
  value.r = 255;
  
  LED.set_crgb_at(p, value);
  LED.sync(); // Sends the data to the LEDs
  delay(25);
  LED.set_crgb_at(p, previousValue);
  LED.sync(); // Sends the data to the LEDs    
}

void loop() {
  blink();
  delay(random(100, 2000));
}