// Exercício 4
// Breno Correia Lociks

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#define PIN_ECHO 2
#define PIN_TRIG 3

void setup() {
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

  lcd.init();
  lcd.setBacklight(HIGH);

  lcd.setCursor(0,0);
  lcd.print("Dist. em CM: ");

  lcd.setCursor(0,1);
  lcd.print("Dist. em IN: ");
}

void loop() {
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  int duration = pulseIn(PIN_ECHO, HIGH);

  int distCM = duration / 58;
  int distIN = duration / 148;

  lcd.setCursor(13,0);
  lcd.print(distCM);

  if(distCM < 10){
    lcd.setCursor(14,0);
    lcd.print("  ");
  }

  if(distCM < 100){
    lcd.setCursor(15,0);
    lcd.print(" ");
  }

  lcd.setCursor(13,1);
  lcd.print(distIN);

  if(distIN < 10){
    lcd.setCursor(14,1);
    lcd.print("  ");
  }

  if(distIN < 100){
    lcd.setCursor(15,1);
    lcd.print(" ");
  }
}