// Link library needed 
#include <RTClib.h> 
#include <Adafruit_Sensor.h>    //For DHT22 Sensor 
#include <DHT.h> 
#include <DHT_U.h> 
#include <LiquidCrystal_I2C.h>  //LCD Display 
 

// Declare Pins & Variable 
#define SW_In_Pin 13
#define DataPin 20            // Pins for Sensor Input 
#define DHTPIN DataPin        
#define DHTTYPE DHT22        
#define LEDPin  17            // Pin for temperature warning Led
#define LED_Out_Pin 11        // Pin for Light system
#define BuzzerPin  16         // Pin for temperature warning buzzer

DHT dht(DHTPIN, DHTTYPE); 
RTC_DS1307 rtc;   //declare rtc object
LiquidCrystal_I2C lcd(0x27,20,4);   //set lcd to I2c . 20 column , 4 rows 
char Light[15];  
char weather[10];
int sensorVal;
const int ANALOG_READ_PIN = 2; 
float Temperature; 
float Humidity; 
char daysOfWeek[7][12] = { 
  "Sunday", 
  "Monday", 
  "Tuesday", 
  "Wednesday", 
  "Thursday", 
  "Friday", 
  "Saturday" 
}; 


void setup() { 
  Serial.begin(115200); 

  // SETUP PIN MODES 
  pinMode(SW_In_Pin, INPUT);
  pinMode(DataPin, INPUT); 
  pinMode(BuzzerPin, OUTPUT); 
  pinMode(LEDPin, OUTPUT); 
  pinMode(LED_Out_Pin, OUTPUT);

  // SETUP DHT22
  dht.begin(); 
 
  // SETUP RTC MODULE 
  if (! rtc.begin()) { 
    Serial.println("RTC module is NOT found"); 
    Serial.flush(); 
    while (1); 
  } 

  // Set the time zone offset to +8 hours 
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)) + TimeSpan(8 * 3600)); 
  // automatically sets the RTC to the date & time on PC this sketch was compiled 
  // manually sets the RTC with an explicit date & time, for example to set 
  // January 21, 2021 at 3am you would call: 
  // rtc.adjust(DateTime(2021, 1, 21, 3, 0, 0)); 
} 


void loop() { 
  // Data print out of DHT22 
  Temperature = dht.readTemperature(); 
  Humidity = dht.readHumidity(); 

  Serial.print("Temperature = "); 
  Serial.print(Temperature); 
  Serial.print(" °C "); 
  Serial.print("    Humidity = "); 
  Serial.print(Humidity); 
  Serial.println(" % "); 

  // Initial promote for temperature
  if (Temperature <= 0) {
      strcpy(weather, "Frozen!");
    } else if (Temperature <= 15) {
      strcpy(weather, "Cold!");
    } else if (Temperature <= 35) {
      strcpy(weather, "Warm");
    } else if (Temperature <= 45) {
      strcpy(weather, "Hot!");
    } else if (Temperature > 45) {
      strcpy(weather, "Alert!!");
    }


  // Warning system for High or Low temperature 
  if (Temperature >= 45) { 
    if(digitalRead(SW_In_Pin) == 0){ //Stop the warning system if bottom click
    Serial.println("Warning! Temperature is too high!"); 
    digitalWrite(LEDPin, HIGH);     // Activate warning LED 
    digitalWrite(BuzzerPin, HIGH);  // Activate buzzer 
    delay(200); 
    digitalWrite(LEDPin, LOW); 
    digitalWrite(BuzzerPin, LOW); 
    delay(5);
    }
  
  } else if (Temperature <= -10) { 
    if(digitalRead(SW_In_Pin) == 0){
    Serial.println("Warning! Temperature is low!"); 
    digitalWrite(LEDPin, HIGH);     // Activate warning LED 
    delay(200); 
    digitalWrite(LEDPin, LOW); 
    delay(5);
   }

  } else{ 
    digitalWrite(LEDPin, LOW);      // Deactivate warning LED 
    digitalWrite(BuzzerPin, LOW);   // Deactivate buzzer
    delay(5);
  }

  //Read and print the light sensor pin value
  sensorVal = analogRead(ANALOG_READ_PIN);
  Serial.print("Lux: ");
  Serial.print(sensorVal);
  Serial.print("     Current situation: ");
  Serial.println(Light);

  // Determine light condition based on sensor value
  if (sensorVal > 7813){         //<1LM
    strcpy(Light, "starga.");
  } else if (sensorVal > 6862){  //<10LM
    strcpy(Light, "Dark");
  } else if (sensorVal > 5062){  //<25LM
    strcpy(Light, "dim");
  } else if (sensorVal > 1360){  //<50LM 
    strcpy(Light, "Light");
  } else if (sensorVal <= 1360){  //<1000LM
    strcpy(Light, "glare");
  }
  if(sensorVal > 5062){
  digitalWrite(LED_Out_Pin, HIGH);   // Activate Street light
  } else {
  digitalWrite(LED_Out_Pin, LOW);  
  }


  // Data print out of RTC_DS1307 
  DateTime now = rtc.now(); 
  Serial.print("ESP32 RTC Date Time: "); 
  Serial.print(now.year(), DEC); 
  Serial.print('/'); 
  Serial.print(now.month(), DEC); 
  Serial.print('/'); 
  Serial.print(now.day(), DEC); 
  Serial.print(" ("); 
  Serial.print(daysOfWeek[now.dayOfTheWeek()]); 
  Serial.print(") "); 
  Serial.print(now.hour(), DEC); 
  Serial.print(':'); 
  Serial.print(now.minute(), DEC); 
  Serial.print(':'); 
  Serial.println(now.second(), DEC); 
  Serial.println("=====================================================");

  //lcd printout 
  lcd.init();                   // initalize 
  lcd.backlight();              // background colour

  // Temperature
  lcd.setCursor(0, 0);
  lcd.print("Temp:");  
  lcd.setCursor(5,0); 
  lcd.print(Temperature); 
  lcd.setCursor(10,0); 
  lcd.print((char)223);         // Printing the temperature symbol 
  lcd.setCursor(11,0); 
  lcd.print("C"); 
  lcd.setCursor(13,0);
  lcd.print(weather);

  // Humidity
  lcd.setCursor(0, 1); 
  lcd.print("Humidity:"); 
  lcd.setCursor(9, 1); 
  lcd.print(Humidity); 
  lcd.setCursor(14, 1);         
  lcd.print("%");               // Printing the humidity symbol 

  // Day
  lcd.setCursor(0, 2);
  lcd.print(now.day());
  lcd.setCursor(2, 2);
  lcd.print("/");
  lcd.print(now.month());
  lcd.setCursor(5,2);
  lcd.print("/");
  lcd.setCursor(6,2);
  lcd.print(now.year());
  lcd.setCursor(11,2);
  lcd.print(daysOfWeek[now.dayOfTheWeek()]);

  // Time
  lcd.setCursor(0,3);
  lcd.print(now.hour());
  lcd.setCursor(2,3);
  lcd.print(":");
  lcd.setCursor(3,3);
  lcd.print(now.minute());
  lcd.setCursor(5,3);
  lcd.print(":");
  lcd.setCursor(6,3);
  lcd.print(now.second());  

  //Light
  lcd.setCursor(9,3);
  lcd.print("Lm:");
  lcd.print(Light);
}