#define I2C_ADDR1   0x27
#define I2C_ADDR2   0x26
#define TRIG_PIN_LONG 13
#define ECHO_PIN_LONG 12
#define TRIG_PIN_SHORT 8
#define ECHO_PIN_SHORT 7
#include <LiquidCrystal_I2C.h>
#include <MPU6050_light.h>
#include <Wire.h>
#include <RTClib.h>
int ldrval = 0; 
int ldrPin = A0; 
int pirPin = 4; 
int pirState = LOW;            
int val = 0; 

const float GAMMA = 0.7;
const float RL10 = 50;

LiquidCrystal_I2C lcd1(0x27, 20, 4);
LiquidCrystal_I2C lcd2(0x26, 16, 2);
MPU6050 mpu(Wire);
RTC_DS1307 rtc;

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN_LONG, OUTPUT);
  pinMode(ECHO_PIN_LONG, INPUT);
  pinMode(TRIG_PIN_SHORT, OUTPUT);
  pinMode(ECHO_PIN_SHORT, INPUT);
  pinMode(pirPin, INPUT);
  lcd1.init();
  lcd1.backlight();
  lcd2.init();
  lcd2.backlight();
  mpu.begin();

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);  // Stop execution if RTC is not found
  }
  DateTime utcTime = DateTime(F(__DATE__), F(__TIME__));
  DateTime istTime = utcTime + TimeSpan(5 * 3600 + 30 * 60);
  rtc.adjust(istTime);
  
}

float read_longdist() {
  digitalWrite(TRIG_PIN_LONG, HIGH);
  delayMicroseconds(10); 
  digitalWrite(TRIG_PIN_LONG, LOW);
  
  int duration = pulseIn(ECHO_PIN_LONG, HIGH);
  return duration * 0.0343 / 2; // Calculate distance in cm
}

float read_shortdist() {
  digitalWrite(TRIG_PIN_SHORT, HIGH);
  delayMicroseconds(10); 
  digitalWrite(TRIG_PIN_SHORT, LOW);

  int duration2 = pulseIn(ECHO_PIN_SHORT, HIGH);
  return duration2 * 0.0343 / 2; 
}


void loop() {
  mpu.update();
  delay(1000);
  ldrval = analogRead(ldrPin);
  Serial.println("LDR: " + String(ldrval));
  Serial.println("Torch Brightness:" + String(ldrval));
  pirState= digitalRead(pirPin);
  if (pirState == HIGH){
    Serial.println("Person: Present");}
  else{
    Serial.println("Person: Absent");}
 


  
  

  DateTime now = rtc.now();

  if (now.hour()==0 && now.minute()==0 && now.second()==0){
    lcd1.clear();
    float longDistance = read_longdist();
    if (longDistance >= 150 && longDistance <= 400) {
      Serial.println("Distance Value: " + String(longDistance) + " cm");
      lcd1.clear();
      lcd1.print("Distance: " + String(longDistance) + " cm");
    }

    // Short-distance reading
    float shortDistance = read_shortdist();
    if (shortDistance >= 2 && shortDistance < 100) {
      Serial.println("Distance Value: " + String(shortDistance) + " cm");
      lcd1.clear();
      lcd1.print("Distance: " + String(shortDistance) );
    }

    
    if (longDistance >= 100 && longDistance < 150) {
      float avgDistance = (0.4*longDistance + 0.6*shortDistance) ;
      Serial.println("Distance Value: " + String(avgDistance) + " cm");
      lcd1.clear();
      lcd1.print("Distance: " + String(avgDistance) + " cm");
    }
    lcd1.setCursor(0,1);
    Serial.println("Z-axis Angular Position: " + String(mpu.getAngleX()));
    lcd1.setCursor(0,1);
    if (mpu.getAngleX()==0) {
      lcd1.print("Z Pos: "+ String(mpu.getAngleX())+ " SUCCESS!");}
    else {
      lcd1.print("Z Position:"+ String(mpu.getAngleX()));}
    lcd1.setCursor(0,2);
    lcd1.print("Use Switch For Time.");
  }
  else{
    lcd1.clear();
    lcd1.setCursor(0,0);
    float longDistance = read_longdist();
    if (longDistance >= 150 && longDistance <= 400) {
      Serial.println("Distance Value: " + String(longDistance) + " cm");
      lcd1.clear();
      lcd1.print("Distance: " + String(longDistance) + " cm");
    }

  
    float shortDistance = read_shortdist();
    if (shortDistance >= 2 && shortDistance < 100) {
      Serial.println("Distance Value: " + String(shortDistance) + " cm");
      lcd1.clear();
      lcd1.print("Distance: " + String(shortDistance) );
    }

  
    if (longDistance >= 100 && longDistance < 150) {
      float avgDistance = (0.4*longDistance + 0.6*shortDistance) ;
      Serial.println("Distance Value: " + String(avgDistance) + " cm");
      lcd1.clear();
      lcd1.print("Distance: " + String(avgDistance) + " cm");
    }
    lcd1.setCursor(0,1);
    lcd1.print("Time:");
    Serial.print("Time: ");
    if (now.hour() < 10) {
      Serial.print('0');
      lcd1.print('0');}  
    Serial.print(now.hour());
    lcd1.print(now.hour());
    Serial.print(':');
    lcd1.print(':');
    if (now.minute() < 10){
      Serial.print('0');
      lcd1.print('0');
    }  
    Serial.print(now.minute());
    lcd1.print(now.minute());
    Serial.print(':');
    lcd1.print(':');
    if (now.second() < 10){ 
      Serial.print('0');
      lcd1.print('0');} // 
    Serial.println(now.second());
    lcd1.print(now.second());
    lcd1.setCursor(0,2);
    lcd1.print("NewTime:");
    Serial.print("NewTime: ");
    DateTime now = rtc.now()+ TimeSpan(3);
    if (now.hour() < 10) {
      Serial.print('0');
      lcd1.print('0');}  
    Serial.print(now.hour());
    lcd1.print(now.hour());
    Serial.print(':');
    lcd1.print(':');
    if (now.minute() < 10){
      Serial.print('0');
      lcd1.print('0');
    }  
    Serial.print(now.minute());
    lcd1.print(now.minute());
    Serial.print(':');
    lcd1.print(':');
    if (now.second() < 10){ 
      Serial.print('0');
      lcd1.print('0');} 
    Serial.println(now.second());
    lcd1.print(now.second());
    lcd1.setCursor(0,3);
    lcd1.print("Use Switch For Z pos");


  }


}