#include "DHT.h"
#include "LiquidCrystal_I2C.h"
#include "RTClib.h"

#define DHTPIN 27
RTC_DS1307 rtc;
#define DHTTYPE DHT22
int relay = 13, r = 32;
int reNF;
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  pinMode(relay, OUTPUT);
  lcd.init();
  lcd.backlight();
  dht.begin();
#ifndef ESP8266
  while (!Serial);
#endif
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }
}

void loop() {
  DateTime now = rtc.now();
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  int val = analogRead(r);
  float v = val * 3.3 / 4095;
  int PR = map(val, 0, 4095, 0, 100);

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print("%, Potentiometer Voltage: ");
  Serial.print(v);
  Serial.print("V, Time: ");
  Serial.print(now.hour());
  Serial.print(":");
  Serial.print(now.minute());
  Serial.print(":");
  Serial.print(now.second());
  Serial.print(", Relay: ");
  
 // Control relay based on humidity and potentiometer voltage
if (h > 65 && v < 1.7) {
  // Calculate the time elapsed since the last 18-second interval
  int timeElapsed = now.second() % 18;
//The relay will turn on every 18 seconds (18, 36, 54, etc.).
//It will stay on for 3 seconds before turning off (18 + 3 = 21, 36 + 3 = 39, 54 + 3 = 57, etc.).
  // Turn on the relay if it's within the first 3 seconds of the 18-second interval
  if (timeElapsed < 3) {
    digitalWrite(relay, HIGH);
    reNF = 1;
    Serial.print("ON");
  } else {
    // Otherwise, turn off the relay
    digitalWrite(relay, LOW);
    reNF = 0;
    Serial.print("OFF");
  }
} else if (h < 65 && v > 1.7) {
  // If conditions are not met, turn off the relay
  digitalWrite(relay, LOW);
  reNF = 0;
  Serial.print("OFF");
}

  Serial.println();

  // Display humidity and potentiometer voltage on LCD line 1
  lcd.setCursor(0, 0);
  lcd.print("H:");
  lcd.print(h);
  lcd.print("% P:");
  lcd.print(v);
  lcd.print("V");

  // Display time and relay status on LCD line 2
  lcd.setCursor(0, 1);
  lcd.print("T:");
  lcd.print(now.hour());
  lcd.print(":");
  lcd.print(now.minute());
  lcd.print(":");
  lcd.print(now.second());
  lcd.print("R: ");
  if (reNF == 1) {
    lcd.print("ON");
  } else {
    lcd.print("OFF");
  }

  if (now.second() == 59) {
    delay(500);
    lcd.clear();
  }
  delay(500);
}