#include <EasyUltrasonic.h>
#include <LiquidCrystal_I2C.h>

EasyUltrasonic sonic;
LiquidCrystal_I2C lcd(0x27, 16, 2);

int led[8] = { 2, 3, 4, 5, 6, 7, 8, 9 };
int trig = 10, echo = 11;

void setup() {
  lcd.init();
  lcd.backlight();
  sonic.attach(trig, echo);
  for (int i = 0; i < 8; i++) {
    pinMode(led[i], OUTPUT);
    digitalWrite(led[i], HIGH);
  }
}

void loop() {
  int cm = sonic.getDistanceCM();
  int numled = 0;
  if (cm < 20) {
    for (int i = 0; i < 8; i++) {
      digitalWrite(led[i], HIGH);
    }
  } else {
    if (cm <= 90) {
      numled = map(cm, 20, 90, 1, 8);
    } else {
      numled = 8;
    }
    for (int i = 0; i < numled; i++) {
      digitalWrite(led[i], LOW);
    }
    for (int i = numled; i< 8; i++){
      digitalWrite(led[i],HIGH);
    }
  }
  lcd.setCursor(0, 0);
  lcd.print("Distance: " + String(cm) + "cm  ");
  lcd.setCursor(0, 1);
  lcd.print("Da bat  : " + String(numled) + " led");
}