/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-dht22
 */

#include <DHT.h>
#include <LiquidCrystal.h>
#define DHT22_PIN  21 // ESP32 pin GPIO21 connected to DHT22 sensor
const int relay = 26;

DHT dht22(DHT22_PIN, DHT22);
LiquidCrystal lcd(19, 23, 18, 17, 16, 15);

void setup() {
  Serial.begin(9600);
  dht22.begin(); // initialize the DHT22 sensor
    // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("Temp | Humidity:");
  pinMode(relay, OUTPUT);
}

void loop() {
  // read humidity
  float humi  = dht22.readHumidity();
  // read temperature in Celsius
  float tempC = dht22.readTemperature();
  // read temperature in Fahrenheit
  float tempF = dht22.readTemperature(true);

  // check whether the reading is successful or not0
  if ( isnan(tempC) || isnan(tempF) || isnan(humi)) {
    Serial.println("Failed to read from DHT22 sensor!");
  } else {
    Serial.print("Humidity: ");
    Serial.print(humi);
    Serial.print("%");

    Serial.print("  |  ");

    Serial.print("Temperature: ");
    Serial.print(tempC);
    Serial.print("°C  ~  ");
    Serial.print(tempF);
    Serial.println("°F");
    lcd.setCursor(0, 1);
    lcd.print(tempC);
    lcd.print(" | ");
    lcd.println(humi);
  
  if (tempC < 20){
  digitalWrite(relay, LOW);
  Serial.println("Current Flowing");
  delay(1000); 
  } else {
  // Normally Open configuration, send HIGH signal stop current flow
  // (if you're usong Normally Closed configuration send LOW signal)
  digitalWrite(relay, HIGH);
  Serial.println("Current not Flowing");
  }
  }
  // wait a 2 seconds between readings
  delay(5000);
}