#include <LiquidCrystal_I2C.h> 
#include <RTClib.h> 
#include <Wire.h>

#define Button 2
#define led 8
#define led2 7
#define led3 6
#define led4 5
#define SERIAL_OPTION 0        


LiquidCrystal_I2C lcd(0x27,16,2); 
RTC_DS1307 RTC;
int temp;
const float GAMMA = 0.7;
const float RL10 = 50;

byte lastButtonState;
byte ledstate = LOW;
byte ledtest = LOW;
void setup() {
  Serial.begin(9600);  
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(Button, INPUT_PULLUP);
  lcd.init();  
  lcd.backlight(); 

  lastButtonState = digitalRead(Button);
  RTC.begin();
 // RTC.adjust(DateTime(2022,9,30,18,13,40));
}

void loop() {
  DateTime now=RTC.now();
  byte buttonState = digitalRead(Button);
  if(buttonState != lastButtonState){
    lastButtonState = buttonState;
    if(buttonState == LOW ){
      if(ledstate == HIGH){
        ledstate = LOW;
      }else{
        ledstate = HIGH;
      }
    }
  }
    light_check();
    temp_check();
    lcd.setCursor(0,0); lcd.print("DATE: ");
    lcd.print(now.year()); lcd.print("/"); lcd.print(now.month()); lcd.print("/"); lcd.print(now.day());
    lcd.setCursor(0,1); lcd.print("TIME: ");
    lcd.print(now.hour()); lcd.print(":"); lcd.print(now.minute());
    delay(100);
   temp = now.second();
    if(temp == 30){
     digitalWrite(led2, HIGH);
     digitalWrite(led3, LOW);
     digitalWrite(led4, LOW);
    }
    if(temp == 45){
     digitalWrite(led2, LOW);
     digitalWrite(led3, HIGH);
     digitalWrite(led4, LOW);
    }
    if(temp == 0){
     digitalWrite(led2, LOW);
     digitalWrite(led3, LOW);
     digitalWrite(led4, HIGH);
    }
}
void light_check(){
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.print("Lux = ");
  Serial.println(lux);
  if(lux >= 400){
    digitalWrite(led, HIGH);
  }else{
    digitalWrite(led, LOW);
  }
  delay(1000);
}
void temp_check() {
   int tempu = analogRead(A1);
   const float BETA = 3950; // should match the Beta Coefficient of the thermistor
   float celsius = 1 / (log(1 / (1023. / tempu - 1)) / BETA + 1.0 / 298.15) - 273.15;


  Serial.print("Temperature: ");
  Serial.print(celsius);    // print the temperature in Celsius
  Serial.println("°C");
   delay(1000); // update sensor reading each one second
}