#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // Initialize the library with the numbers of the interface pins;
  // Define variables to store the input values
  //12: RS (Register Select) pin
  //11: E (Enable) pin
  //5: D4 (Data Bit 4) pin
  //4: D5 (Data Bit 5) pin
  //3: D6 (Data Bit 6) pin
  //2: D7 (Data Bit 7) pin
int MEm1;     //Medical Emergency;
int REm1;     //Rescue Emergency;
int SEm1;     //Security Emergency;
int scon=1;   //control Home1;
int scon1=0;  //control Home2;
int scon2=0;  //control Home3;
int scon3=0;  //control Home4;
int buzzer_butt=1; // buzzer control button;
int Home1;  // 1st home data hold;
int Home2;  // 2nd home data hold;
int Home3;  // 3rd home data hold;
int Home4;  // 4th home data hold;
void setup() {
  // put your setup code here, to run once:
  Home1=Home2=Home3=Home4=0; // All Home data is make 0;
  pinMode(6, INPUT);    // 1st Input from Reciver;
  pinMode(7, INPUT);    // 2nd Input from Reciver;
  pinMode(8, INPUT);    // 3rd Input from Reciver;
  pinMode(9, OUTPUT);   // Input for 1st NPN transistor;
  pinMode(10, OUTPUT);  // Input for 2nd NPN transistor;
  pinMode(13, OUTPUT);  // buzzer;
  pinMode(0, INPUT);
  lcd.begin(20, 4);     // Set up the LCD's number of columns and rows:

  lcd.clear();          // initioal screen display
  lcd.setCursor(0, 0);
  lcd.print("HOME SAFETY EMERGENC"); // 1st line
  lcd.setCursor(0, 1);
  lcd.print("Y RESPONSE SYSTEM");     // 2nd line
  delay(1000);
  digitalWrite(13, LOW);
}

void loop() {
  if (Home1 == 0 && Home2 == 0 && Home3 == 0 && Home4 == 0 && scon == 1) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("HOME 1 NO_EMERGENCY"); // initioal screen
    lcd.setCursor(0, 1);
    lcd.print("HOME 2 NO_EMERGENCY");
    lcd.setCursor(0, 2);
    lcd.print("HOME 3 NO_EMERGENCY");
    lcd.setCursor(0, 3);
    lcd.print("HOME 4 NO_EMERGENCY");
    scon=0;
  }
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
 

  // Read the input values
  MEm1 = digitalRead(6);
  REm1 = digitalRead(7);
  SEm1 = digitalRead(8);

  // Check the conditions
  if (MEm1 == 0 && REm1 == 1 && SEm1 == 1) {
    Home1=1;    // medical emergency
    scon=3; 
    
  } else if (MEm1 == 1 && REm1 == 0 && SEm1 == 1) {
    Home1=2; //rescue emergency
    scon=3;
    
  } else if (MEm1 == 1 && REm1 == 1 && SEm1 == 0) {
    Home1=3;  //security emergency
    scon=3; 

  }
  if (MEm1 == 0 && REm1 == 0 && SEm1 == 0) {
    Home1=0; // clear emergency
    scon=3;  
  }
  // Wait a little before reading again
  delay(1);


  digitalWrite(9, HIGH);
  digitalWrite(10, LOW);
  // Read the input values
  MEm1 = digitalRead(6);
  REm1 = digitalRead(7);
  SEm1 = digitalRead(8);

  // Check the conditions
  if (MEm1 == 0 && REm1 == 1 && SEm1 == 1) {
    Home2=1;
    scon1=3; 
    
  } else if (MEm1 == 1 && REm1 == 0 && SEm1 == 1) {
    Home2=2;
    scon1=3; 
    
  } else if (MEm1 == 1 && REm1 == 1 && SEm1 == 0) {
    Home2=3;
    scon1=3; 
    
  }
  if (MEm1 == 0 && REm1 == 0 && SEm1 == 0) {
    Home2=0;  // clear emergency
    scon1=3; 
    
  }

  // Wait a little before reading again
  delay(1);

  digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
  // Read the input values
  MEm1 = digitalRead(6);
  REm1 = digitalRead(7);
  SEm1 = digitalRead(8);

  // Check the conditions
  if (MEm1 == 0 && REm1 == 1 && SEm1 == 1) {
    Home3=1;
    scon2=3;
    
  } else if (MEm1 == 1 && REm1 == 0 && SEm1 == 1) {
    Home3=2;
    scon2=3;
    
  } else if (MEm1 == 1 && REm1 == 1 && SEm1 == 0) {
    Home3=3;
    scon2=3;
    
  }
  if (MEm1 == 0 && REm1 == 0 && SEm1 == 0) {
    Home3=0;  // clear emergency
    scon2=3;
    
  }

  // Wait a little before reading again
  delay(1);
  
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  // Read the input values
  MEm1 = digitalRead(6);
  REm1 = digitalRead(7);
  SEm1 = digitalRead(8);

  // Check the conditions
  if (MEm1 == 0 && REm1 == 1 && SEm1 == 1) {
    Home4=1;
    scon3=3;
    
  } else if (MEm1 == 1 && REm1 == 0 && SEm1 == 1) {
    Home4=2;
    scon3=3;
    
  } else if (MEm1 == 1 && REm1 == 1 && SEm1 == 0) {
    Home4=3;
    scon3=3;
    
  }
  if (MEm1 == 0 && REm1 == 0 && SEm1 == 0) {
    Home4=0;  // clear emergency
    scon3=3;
    
  }

  // Wait a little before reading again
  delay(1);
  // put your main code here, to run repeatedly:
  


  // display emergence massage
  if (Home1 != 0 || Home2 != 0 || Home3 != 0 || Home4 != 0) {
    if (Home1 == 1 && scon == 3){
      //Medical Emergency
      clearLine(0);
      lcd.setCursor(0, 0);
      lcd.print("HOME 1 MEDICAL_EMERG");
      digitalWrite(13, HIGH);

    } else if (Home1 == 2 && scon == 3) {
      //Rescue emergency
      clearLine(0);
      lcd.setCursor(0, 0);
      lcd.print("HOME 1 RESCUE_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home1 == 3 && scon == 3) {
      //Security Emergence
      clearLine(0);
      lcd.setCursor(0, 0);
      lcd.print("HOME 1 SECURITY_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home1 == 0 && scon == 3) {
      //Security Emergence
      clearLine(0);
      lcd.setCursor(0, 0);
      lcd.print("HOME 1 NO_EMERGENCY");
      digitalWrite(13, HIGH);
    }
    if (Home2 == 1 && scon1 == 3){
      //Medical Emergency
      clearLine(1);
      lcd.setCursor(0, 1);
      lcd.print("HOME 2 MEDICAL_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home2 == 2 && scon1 == 3) {
      //Rescue emergency
      clearLine(1);
      lcd.setCursor(0, 1);
      lcd.print("HOME 2 RESCUE_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home2 == 3 && scon1 == 3) {
      //Security Emergence
      clearLine(1);
      lcd.setCursor(0, 1);
      lcd.print("HOME 2 SECURITY_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home2 == 0 && scon1 == 3) {
      //Security Emergence
      clearLine(1);
      lcd.setCursor(0, 1);
      lcd.print("HOME 2 NO_EMERGENCY");
      digitalWrite(13, HIGH);
    }

    if (Home3 == 1 && scon2 == 3){
      //Medical Emergency
      clearLine(2);
      lcd.setCursor(0, 2);
      lcd.print("HOME 3 MEDICAL_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home3 == 2 && scon2 == 3) {
      //Rescue emergency
      clearLine(2);
      lcd.setCursor(0, 2);
      lcd.print("HOME 3 RESCUE_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home3 == 3 && scon2 == 3) {
      //Security Emergence
      clearLine(2);
      lcd.setCursor(0, 2);
      lcd.print("HOME 3 SECURITY_EMER");
      digitalWrite(13, HIGH);
    } else if (Home3 == 0 && scon2 == 3) {
      //Security Emergence
      clearLine(2);
      lcd.setCursor(0, 2);
      lcd.print("HOME 3 NO_EMERGENCY");
      digitalWrite(13, HIGH);
    }

    if (Home4 == 1 && scon3 == 3){
      //Medical Emergency
      clearLine(3);
      lcd.setCursor(0, 3);
      lcd.print("HOME 4 MEDICAL_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home4 == 2 && scon3 == 3) {
      //Rescue emergency
      clearLine(3);
      lcd.setCursor(0, 3);
      lcd.print("HOME 4 RESCUE_EMERG");
      digitalWrite(13, HIGH);
    } else if (Home4 == 3 && scon3 == 3) {
      //Security Emergence
      clearLine(3);
      lcd.setCursor(0, 3);   
      lcd.print("HOME 4 SECURITY_EMER");
      digitalWrite(13, HIGH);
    } else if (Home4 == 0 && scon3 == 3) {
      //Security Emergence
      clearLine(3);
      lcd.setCursor(0, 3);
      lcd.print("HOME 4 NO_EMERGENCY");
      digitalWrite(13, HIGH);
    }
    buzzer_butt=digitalRead(0);
    if (buzzer_butt == 0) {
      digitalWrite(13, LOW);
    }

    scon=0;   //control Home1;
    scon1=0;  //control Home2;
    scon2=0;  //control Home3;
    scon3=0;  //control Home4;

  }


}
//end 
void clearLine(int line) {  // for lcd line clear 0 to 4;
  lcd.setCursor(0, line);
  for (int i = 0; i < 20; i++) {
    lcd.print(" ");
  }
  lcd.setCursor(0, line);
}
 //clearLine(0);  // Clear line 0
 //clearLine(1);  // Clear line 1
 //clearLine(2);  // Clear line 2
 //clearLine(3);  // Clear line 3
    //clearLine(0);
    //lcd.setCursor(0, 0);
    //lcd.print("location1");