#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define DHTPIN 25
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

int buzzer = 14;
int led = 2;

int trig = 5;
int echo = 4;

long duracao;
float distancia;

void setup() {
  dht.begin();

  lcd.init();
  lcd.backlight();

  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);

  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}

void loop() {

  float temp = dht.readTemperature();
  float umid = dht.readHumidity();

  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  duracao = pulseIn(echo, HIGH);
  distancia = duracao * 0.034 / 2;

  if (isnan(temp) || isnan(umid)) {
    lcd.setCursor(0,0);
    lcd.print("Erro no sensor ");
    noTone(buzzer);
    return;
  }


  if (temp > 35 && umid < 30 && distancia < 10) {
    lcd.setCursor(0,0);
    lcd.print("!!! PERIGO !!! ");

    digitalWrite(led, HIGH);
    tone(buzzer, 1000);
  }

  else if (temp > 30 || umid < 40) {
    lcd.setCursor(0,0);
    lcd.print("Temp:");
    lcd.print(temp);

    lcd.setCursor(0,1);
    lcd.print("Umid:");
    lcd.print(umid);

    tone(buzzer, 1000);
    delay(200);
    noTone(buzzer);
    delay(200);
  }

  else if (distancia < 10) {
    lcd.setCursor(0,0);
    lcd.print("Objeto perto  ");

    digitalWrite(led, HIGH);
    noTone(buzzer);
  }

  else {
    lcd.setCursor(0,0);
    lcd.print("Sistema OK    ");
    lcd.setCursor(0,1);
    lcd.print("              ");

    digitalWrite(led, LOW);
    noTone(buzzer);
  }

  delay(300);
}