// the pin we're reading from
int distance_sensor = A0;
// store the distance value / reading from the sensor
int distance_measure = 0;

const int sampleWindow = 10;


int numPins = 6;
int ledPins[ 6 ] = { D0, D1, D2, D3, D4, D5};

void setup(){

  // start serial connection
  Serial.begin(9600);


  for( int i = 0 ; i < numPins; i++ ){
    pinMode(ledPins[ i ], OUTPUT);
  }

  // Share the value as a distance level
  // reading through the cloud
  Particle.variable( "distance", &distance_measure, INT );

}

void loop()
{
  distance_measure = analogRead( distance_sensor );
  //distance_measure = sampleDistance( );
  Serial.println( distance_measure );

  displayDistanceOnLEDs();

  delay( 100 );
}



void displayDistanceOnLEDs(){

  int level = 10;

  for( int i = 0 ; i < numPins; i++ ){
    int led = ledPins[ i ];
    int desiredDistance = level * (i+1);
    if( distance_measure > desiredDistance ){
      digitalWrite( led, HIGH);
    }else{
   digitalWrite( led, LOW);
    }

    }

    int sampleDistance( )
    {
      unsigned long startMillis = millis(); // Start of sample window
      int highest_sample = 0;
      int lowest_sample = 80;
      // collect data for 100 mS
      while (millis() - startMillis < sampleWindow)
      {
        int sample = analogRead( distance_sensor );
      	// invert the range, and convert it to a percent
      	sample = map( sample, 0, 4095, 1000, 0, );
      	// now see if the sample is the lowest;

      	if ( sample > highest_sample ){
      	highest_sample = sample ;
      	}
      	if ( sample < lowest_sample ){
      	lowest_sample = sample;
      	}
      }
      int peakToPeak = highest_sample - lowest_sample;
      return peakToPeak;
    }