NeoPixelRingLDR.ino

#include <Adafruit_NeoPixel.h>

#define LDR_PIN A0
#define PIN 2	 // input pin Neopixel is attached to

#define NUMPIXELS      12 // number of neopixels in Ring

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

int delayval = 0; // timing delay

int redColor = 0;
int greenColor = 0;
int blueColor = 0;

int lightLevel = 0;
int preLightLevel = 0;

void setup() {
  pixels.begin(); // Initializes the NeoPixel library.
//  Serial.begin(9600);
}

void loop() {
  setColor();

  for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(redColor, greenColor, blueColor)); // Moderately bright green color.

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

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

  }

}

// setColor()
// picks random values to set for RGB
void setColor(){
  lightLevel = map(analogRead(LDR_PIN), 0, 1023, 255, 10);
  Serial.println(lightLevel);

  if( preLightLevel != lightLevel ) {
  	redColor = random(0, 10) + lightLevel;
  	greenColor = random(0, 10) + lightLevel;
  	blueColor = random(0, 10) + lightLevel;
  }
  
  preLightLevel = lightLevel;
}