#include <ESP32Servo.h>
#include "RTClib.h"
#include <Wire.h>
#include "SPI.h"
#include <LiquidCrystal_I2C.h>


LiquidCrystal_I2C lcd (0x27, 16,2);

const float GAMMA = 0.7;
const float RL10 = 50;
const int relayPinUV = 34;
RTC_DS1307 rtc;
int pos;
#define Trig 27
#define Echo 14
#define push 13

Servo myservo1;  
Servo myservo2;  




void setup() {

  Serial.begin(115200);  
  // print the Message on the LCD. 
    lcd. init ();
  
  // Turn on the backlight on LCD. 
  lcd. backlight ();   

 

    myservo1.attach(19);
    myservo2.attach(18);
pinMode(Trig, OUTPUT);
pinMode(Echo, INPUT);
pinMode(relayPinUV, OUTPUT);
pinMode(push, INPUT);


// put your setup code here, to run once:
  Wire.begin(21,22);
 rtc.begin();
 
}



float readDistanceCM() {
  digitalWrite(Trig, LOW);
  delayMicroseconds(2);
  digitalWrite(Trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig, LOW);
  int duration = pulseIn(Echo, HIGH);
  return duration * 0.034 / 2;
}


void loop() {
 

   DateTime now = rtc.now();
  

  // put your main code here, to run repeatedly:
   int analogValue = analogRead(12);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  float distance = readDistanceCM();

    if(lux >3800 & distance >=200){
       myservo1.write(90);
       myservo2.write(90); 
       digitalWrite( relayPinUV, LOW); 
      
              
    }

else if (lux <3800 & lux >2800 & distance >=200) {
myservo1.write(0);
myservo2.write(90);

}


else if (lux <2800 & lux >0 & distance <=200) {
myservo1.write(90);
myservo2.write(0);

  
delay( 600);

}

else if (lux <3600 ) {

digitalWrite( relayPinUV, HIGH);
  


}

else if (lux <3600 ) {

digitalWrite( relayPinUV, LOW);
  
}


else {
myservo1.write(0);  
myservo2.write(90);
 
}


 
if (digitalRead (push) == HIGH)
myservo1.write(30);


    //Here cursor is placed on first position (col: 0) of the second line (row: 1) 
  lcd. setCursor (0, 1);
   // We write the number of seconds elapsed 

  lcd.println(lux);


  delay (100);
 Serial.print("Lux: ");
  Serial.print(lux);


}