/**
   ESP32 + DHT22 Example for Wokwi
   
   https://wokwi.com/arduino/projects/322410731508073042
*/

#include "DHTesp.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x3F or 0x27 16 column and 2 rows

const int DHT_PIN = 15;
#define fan 4 // ESP32 pin connected to relay
#define TEMP_UPPER_THRESHOLD  30 // upper temperature threshold
#define TEMP_LOWER_THRESHOLD  15 // lower temperature threshold

DHTesp dhtSensor;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
 // dht_sensor.begin(); // initialize the DHT sensor
  lcd.init();         // initialize the lcd
  lcd.backlight();    // open the backlight
  pinMode(fan, OUTPUT);

}

void loop() {
  lcd.clear();
  lcd.setCursor(0, 0);
 // float temperature = dht_sensor.readTemperature();;  // read temperature in Celsius

  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  float humi  = dhtSensor.getHumidity();    // read humidity
  float tempC = dhtSensor.getTemperature(); // read temperature
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
    lcd.print("Temp: ");
    lcd.print(tempC);     // display the temperature
    lcd.print(" C");

    lcd.setCursor(0, 1);  // display position
    lcd.print("Humi: ");
    lcd.print(humi);      // display the humidity
    lcd.print(" %");
  delay(1000);

  if (isnan(tempC)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    if (tempC > TEMP_UPPER_THRESHOLD) {
      Serial.println("Turn the fan on");
      digitalWrite(fan, HIGH); // turn on
    } else if (tempC < TEMP_LOWER_THRESHOLD) {
      Serial.println("Turn the fan off");
      digitalWrite(fan, LOW); // turn off
    }
  }



}