byte trigger = 8, echo = 10;

void setup() {
  /*
  pinMode(8, OUTPUT);
  */
  for(int pin = 2; pin <= 9; pin++){
    pinMode(pin, OUTPUT);
  }

  pinMode(echo, INPUT);
  Serial.begin(9600);

}

void loop() {
  /*
  int pot = analogRead(A0);
  
  Serial.println(pot);
  */

  //envia pulso de 10uS
  digitalWrite(trigger, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigger, LOW);

  //calculo la distancia
  int time = pulseIn(echo, HIGH);
  int distancia = time/58;
  Serial.println(distancia);

  LEDSR(distancia, 600);

}

void LEDSR(int dist, int pot){
  if(dist > 100){
    for(int l = 2; l <= 7; l++){
      digitalWrite(l, LOW);
    }
  }else if(dist > 70 && dist <= 100){
    for(int l = 6; l <= 7; l++){
      digitalWrite(l, HIGH);
      digitalWrite(5, LOW);
      digitalWrite(4, LOW);
      digitalWrite(3, LOW);
      digitalWrite(2, LOW);

      tone(9, pot);
      delay(600);
      noTone(9);
    }
  }else if(dist > 45 && dist <= 70){
    for(int l = 4; l <= 7; l++){
      digitalWrite(l, HIGH);
      digitalWrite(3, LOW);
      digitalWrite(2, LOW);

      tone(9, pot);
      delay(400);
      noTone(9);
    }
  }else if(dist > 20 && dist <= 45){
    for(int l = 2; l <= 3; l++){
      digitalWrite(l, HIGH);
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, LOW);
      digitalWrite(7, LOW);
    }
  }else if(dist > 10 && dist <= 20){
    led1(1,1,1,1,1,1);
    tone(9, pot);
    delay(200);
    noTone(9);
    led1(0,0,0,0,0,0);
    delay(200);
  }
}

void led1(int led2, int led3, int led4, int led5, int led6, int led7){
  digitalWrite(2, led2);
  digitalWrite(3, led3);
  digitalWrite(4, led4);
  digitalWrite(5, led5);
  digitalWrite(6, led6);
  digitalWrite(7, led7);
}