dunno

#include <LiquidCrystal.h>

int buzzer = 24;
int leds[6] = {53, 51, 49, 47, 45, 43};
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

#include <Ultrasonic.h>

Ultrasonic ultrasonic(31, 30);
int distance;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  for(int i = 0; i <7; i++){
    pinMode(leds[i], OUTPUT);
  }
  pinMode(buzzer, OUTPUT);
}

void loop() {
  // Pass INC as a parameter to get the distance in inches
  distance = ultrasonic.read(CM);

  lcd.print("Dist: ");
  lcd.println(distance);
  delay(300);
  lcd.clear();


  if(distance < 10){
    tone(buzzer, 4000);
    for(int i = 0; i <7; i++){
    digitalWrite(leds[i], 1);
  }

  //  led(6);

  }
  if(distance >=10 && distance<20){
    tone(buzzer, 3300);
    for(int i = 0; i <6; i++){
    digitalWrite(leds[i], 1);
  }
   //  led(5);


  }
  if(distance>= 20 && distance < 30){
    tone (buzzer, 2000);
    for(int i = 0; i <5; i++){
    digitalWrite(leds[i], 1);
  }

    // led(4);

  }
if(distance>=30 && distance <40){
  tone(buzzer, 1500);
  for(int i = 0; i <4; i++){
    digitalWrite(leds[i], 1);
  }

   //led(3);

}
if(distance>= 40 && distance<50){
  tone(buzzer, 1000);
  for(int i = 0; i <3; i++){
    digitalWrite(leds[i], 1);
  }

   //led(2);

}
if(distance>=50){
  tone(buzzer, 500);
  for(int i = 0; i <2; i++){
    digitalWrite(leds[i], 0);
  }

  // led(1);

}
}
/*
void led(int qntdLeds){
  for(int i = 0; i < qntdLeds; i++){
    digitalWrite(led[i], HIGH);
  }
  for(int i = 5; i > qntdLeds - 1; i--){
    digitalWrite(led[i], LOW);
  }
}*/