#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  // Sets the trigger pin to HIGH state for 10 microseconds
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  // Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin, HIGH);
}

void setup()
{
  lcd.init();
  lcd.setBacklight(1);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(1, OUTPUT);
}

void loop()
{
  if (0.01723 * readUltrasonicDistance(12, 11) < 10) {
    digitalWrite(10, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 20) {
    digitalWrite(10, LOW);
    digitalWrite(9, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 30) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 40) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 50) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 60) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 70) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 80) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 90) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    digitalWrite(3, LOW);
    digitalWrite(2, HIGH);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) < 100) {
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    digitalWrite(3, LOW);
    digitalWrite(2, LOW);
    digitalWrite(1, HIGH);
  }
  if (0.01723 * readUltrasonicDistance(12, 11) > 110) {
    lcd.setCursor(0,0);
    lcd.print("      FARE      ");
    lcd.setCursor(0,1);
    lcd.print("  RIFORNIMENTO  ");
  }
  else{lcd.setCursor(0,0);
    lcd.print("                ");
    lcd.setCursor(0,1);
    lcd.print("                ");
    }
     
  delay(10); // Delay a little bit to improve simulation performance
}