Code for Artificial Candle

artificial_candle.ino

#include <Adafruit_NeoPixel.h>
#include <ColorConverter.h>


int currentLevel = 1;
int change = 1;
byte levelTable[256]; // pre-calculated PWM levels
 
const int neoPixelPin = 5;   // control pin
const int pixelCount = 7;    // number of pixels
//float change = 1;              // increment to change hue by

const int buttonPin = 2;
int buttonState = 0; 
 
// set up strip:
Adafruit_NeoPixel strip = Adafruit_NeoPixel(pixelCount, neoPixelPin, NEO_GRBW + NEO_KHZ800);
ColorConverter converter;
 
int h = 10;         // hue
int s = 100;        // saturation
int i = 100;        // intensity
 
void setup() {
  Serial.begin(9600);
  // pre-calculate the PWM levels from the formula:
  fillLevelTable();

  strip.begin();    // initialize pixel strip
  strip.clear();    // turn all LEDs off
  strip.show();     // update strip

  pinMode(neoPixelPin, OUTPUT);      
  pinMode(buttonPin, INPUT);  
}
 
void loop() {
  // create a single color from hue, sat, intensity:
  RGBColor color = converter.HSItoRGB(h, s, i);

  buttonState = digitalRead(buttonPin);
 
  // loop over all the pixels:
  for (int pixel = 0; pixel < pixelCount; pixel++) {
    strip.setPixelColor(pixel, color.red, color.green, color.blue);    // set the color for this pixel
    strip.show();   // update the strip
//    delay(random(0,1000));
  }
 
  // increment hue to fade from red (0) to reddish orange (15) and back:
  h = h + change;
  if (h <= random(8, 14) || h >= 15) {//15
    change = -change;
  }

  currentLevel += change;


    //PWM output the result:
  delay(random(3, 20));
  analogWrite(9, levelTable[currentLevel]);
  
  Serial.println(levelTable[currentLevel]);


  if (buttonState == HIGH) {
    digitalWrite(neoPixelPin, LOW);  
    
  } else {
    // turn LED off:
    digitalWrite(neoPixelPin, HIGH); 
  }

  Serial.print(buttonState);
}


void fillLevelTable() {
  // set the range of values:
  float maxValue = 255;

  // iterate over the array and calculate the right value for it:
  for (int l = 0; l <= maxValue; l++) {
    // square the current value:
    float lightLevel = pow(l, 2);
    // map the result back to a 0-255 range:
    lightLevel = map(lightLevel, 0, 65535, 0, 255);
    levelTable[l] = lightLevel;
    
  }
}