/*
  HC-SR04 Ultrasonic Sensor Example.

  Turn the LED on when an object is within 100cm range.

  Copyright (C) 2021, Uri Shaked
*/
#include <DHT.h>
#include <Wire.h>
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define ECHO_PIN 2
#define TRIG_PIN 3

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
LiquidCrystal_I2C lcd2(0x30, 16, 2);
int val = 0;

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  lcd.init();
  lcd.backlight();
  lcd2.init();
  lcd2.backlight();

   dht.begin();

}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
   float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  float distance = readDistanceCM();

  bool isNearby = humidity < 20;
  digitalWrite(LED_BUILTIN, isNearby);

  Serial.print("Distância: ");
  Serial.print(readDistanceCM());
Serial.println("mm");
  delay(100);

  distance = map(readDistanceCM(), 0, 100, 100, 0);
if (distance < 0){
  distance = 0;
}
  lcd2.setCursor(0, 0);
  lcd2.print("Distan:");
  lcd2.setCursor(7, 0);
  lcd2.print(distance);
  lcd2.print("% ");

  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.setCursor(6, 0);
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Umidade: ");
  lcd.setCursor(9, 1);
  lcd.print(humidity);
  lcd.print(" %");
}