//exercicio 4
//Gabriel Lisboa Leite de Melo
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define PIN_TRIG 3
#define PIN_ECHO 2

void setup() {
  lcd.init();
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
}
void loop() {
  
 lcd.setBacklight(1);
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
   int duration = pulseIn(PIN_ECHO, HIGH);

 int distanciaCM = (duration/58);
 int distanciaM = (distanciaCM/100);
 int distancia = distanciaCM - 2;
 if(distancia > 400){
  int distancia = 400;
 }
lcd.clear();
 lcd.setCursor(3,0);
 lcd.print("Distancia");
 lcd.setCursor(2,1);
 lcd.print(distancia);
 lcd.print("Cm");
 lcd.setCursor(11,1);
 lcd.print(distanciaM);
 lcd.print("M");
 
 delay(500);

}