int in[5] =  {A1 , A2, A3, A4, A5};
#define GREEN   9
#define RED    10
#define BLUE   11
#define TIME   2000
#define TIME_INC   10
#define inc 255*TIME_INC/TIME

#define COLOUR BLUE

const long referenceMv = 5000;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  analogWrite(RED, 0);
  analogWrite(GREEN, 0);
  analogWrite(BLUE, 0);
}

unsigned long time_sensor = millis();
unsigned long time_fade = millis();
unsigned long time_inc = millis();

int value = 0;

void loop() {
  // put your main code herddfe, to run repeatedly:
  if ((millis()-time_sensor)>=100)
    {
      Serial.print("Sensor:");
      for(int i=0; i<5; i++)
        {
          int val = analogRead(in[i]);
          int mV = (val * referenceMv) / 1023;
          int cm = getDistance(mV);
          Serial.print(cm);
          if (i<4)Serial.print(",");
          else Serial.println(); 
        }
      time_sensor = millis();
    }
  if ((millis()-time_fade)<TIME)
    {
      if ((millis()-time_inc)>=TIME_INC) 
        {
          if((value+inc)>255) value = 255;
          else value = value+inc;
          analogWrite(COLOUR, value);
          time_inc = millis();
        }
    }
  else if ((millis()-time_fade)<2*TIME)
    {
      if ((millis()-time_inc)>=TIME_INC) 
        {
          if((value-inc)<0) value = 0;
          else value = value-inc;
          analogWrite(COLOUR, value);
          time_inc = millis();
        }
    }
  else time_fade = millis();
  
    
}

//interpolación de la distancia a intervalos de 250mV
const int TABLE_ENTRIES = 12;
const int INTERVAL  = 250;
static int distance[TABLE_ENTRIES] = {150,140,130,100,60,50,40,35,30,25,20,15};
int getDistance(int mV) {
   if (mV > INTERVAL * TABLE_ENTRIES - 1)      return distance[TABLE_ENTRIES - 1];
   else {
      int index = mV / INTERVAL;
      float frac = (mV % 250) / (float)INTERVAL;
      return distance[index] - ((distance[index] - distance[index + 1]) * frac);
   }
}