Modular alarm system with motion detection!

#include <Keypad.h>
#include <SoftwareSerial.h>
#include <U8g2lib.h>
#include <SPI.h>
#include <Wire.h>

#define Password_Length 6

char Data[Password_Length];
char Master[Password_Length] = "B1234;
byte data_count = 0;
char customKey;

// *** KEYPAD CONFIGURATION ***
const byte ROWS = 4;
const byte COLS = 4;

char hexaKeys [ROWS][COLS]={
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
  }; // Keys on keypad

byte rowPins[ROWS] = {9,8,7,6};
byte colPins[COLS] = {5,4,3,2};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

unsigned long tiempo1, tiempo2;

int siren     = 10;
int signalPin = 11; // digitalni pin
int pirSensor = 12; // digitalni pin
int led_Alarm = 13; // digitalni pin

int alarmSystem = 1; //ALARM IS OFF (0) OR ON (1)

int senzorValue = 0;

int ledHigh = 0;

int counter = 0;

int state = 0;

U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0); 


void setup() {

  Serial.begin(9600);
  u8g2.begin();
  delay(5000);
  Serial.println("Secutiry Alarm System");
  pinMode(signalPin, OUTPUT);
  pinMode(pirSensor, INPUT);
  pinMode(led_Alarm, OUTPUT);
  pinMode(siren, OUTPUT);
  Serial.print("Alarmsystem has status:");
  Serial.println(alarmSystem);
  Serial.println("Program started");
  delay(1999);  
}

void loop() {

  if (alarmSystem == 1){

    if (state == 0){
      digitalWrite(led_Alarm, LOW);
      digitalWrite(siren, LOW);
      u8g2.clearBuffer(); 
      u8g2.setFont(u8g2_font_courR10_tf);
      u8g2.drawStr(8,10, "Alarm is");
      u8g2.drawStr(8,24, "ON!");
      u8g2.sendBuffer();
      tiempo1 = millis(); // read the internal clock
      tiempo2 = millis(); // read the internal clock
      Serial.println("WE ARE IN STATE 0");  
      Event();
      senzorValue = digitalRead(pirSensor); // Sensor returns 1 - HIGH, if detects motion and 0 - LOW if does not detect motion
                                            // Senzor nam vrne 1 - HIGH e je zaznal gibanje in 0 - LOW e ni zaznal gibanja

      if (senzorValue == HIGH){
        state = 1;
        u8g2.clearBuffer(); 
        u8g2.setFont(u8g2_font_courR14_tf);
        u8g2.drawStr(16,12, "MOTION");
        u8g2.drawStr(16,28, "DETECTED!");
        u8g2.sendBuffer();

        while (tiempo1 < tiempo2 + 20000){
          customKey = customKeypad.getKey();
          if (customKey == '*'){
            Event2();
            tiempo1 = tiempo1 + 50000;
            //Serial.println("SMO TUKAJ 1");
            Serial.println(tiempo1);
            Serial.println(tiempo2);
            delay(2000);
          }
          else{tiempo1 = millis(); 
		  //Serial.println("SMO TUKAJ 2");
		  }
        }
      }
    }
    
    if (state == 1){  

      // ADD COUNT DOWN FOR TURN ON ALARM SYSTEM, IF PASSWORD IS   
      // DODAMO COUNT DOWN ZA PRIIG ALARMA, E V TEM ASU VNESE GESLO SE ALARM RESETIRA!
      
      tiempo2 = millis();
      unsigned long i = 5000;
      tiempo2 = tiempo2 + i;
      int x = 0;
      int y = 0;
  
      while (tiempo1 < tiempo2) // loop for counting down 30 seconds if password is correct
      {
        //Serial.println("SMO TUKAJ 3");      
        tiempo1 = millis();
        x = (tiempo2 - tiempo1) / 1000;
  
        // if is oply for print on the display!
        if ( y != x){
          u8g2.clearBuffer();          
          u8g2.setFont(u8g2_font_courR14_tf);
          u8g2.drawStr(16,12, "Countdown: ");
          u8g2.setCursor(40,32);
          u8g2.print(x);
          u8g2.sendBuffer();                              
        }
        y = x;          
      }        

      while (state != 0){
        //Serial.println("SMO TUKAJ 4");
        u8g2.clearBuffer();          
        u8g2.setFont(u8g2_font_courR14_tf);
        u8g2.drawStr(16,12, "Siren is");
        u8g2.drawStr(16,32, "turnedOn");
        u8g2.sendBuffer();   
        digitalWrite(led_Alarm, HIGH);
        digitalWrite(siren, HIGH);        
        Event();
      }
      digitalWrite(led_Alarm, LOW);
      digitalWrite(siren, LOW);  
    }    
  }

  // ALARM SYSTEM IS OFF (alarmSystem = 0) 
  else {

    //Serial.print("Counter je: ");
    //Serial.println(counter);
    //Serial.println("SMO TUKAJ 0");
        
    u8g2.clearBuffer(); 
    u8g2.setFont(u8g2_font_courR10_tf);
    u8g2.drawStr(8,10, "Alarm is");
    u8g2.drawStr(8,24, "turnedOff");
    u8g2.setCursor(96,24);
    u8g2.print(alarmSystem);
    u8g2.sendBuffer();    
    Event(); 
  }
}


//////// ******* Methods ******* ////////  

void PreverjanjeGesla(){

  u8g2.clearBuffer();

  if(!strcmp(Data, Master)){ // if password is correct, e je geslo pravilno 

    tiempo2 = millis();
    unsigned long i = 0;

    if (alarmSystem == 0){
    i = 30000; 	// by default here is 30 seconds time to move out from PIR sensor, 
				// po defaultu bo tukaj 30 sekund, da se lahko v miru umakne, ko bo alarmni sistem vkljuen 
    }
    else{
    i = 5000;
    }
    tiempo2 = tiempo2 + i;
    int x = 0;
    int y = 0;

    while (tiempo1 < tiempo2) 	//	loop for countdown of 10 seconds if password was typed correctly, 
								// 	zanka za odtevanje 10 sekund e je geslo PRAVILNO
    {      
      digitalWrite(signalPin, HIGH);

      tiempo1 = millis();
      x = (tiempo2 - tiempo1) / 1000;

      // if is only for output on display
	  // if je samo za izpis na zaslon!
      if ( y != x){
        u8g2.clearBuffer();          
        u8g2.setFont(u8g2_font_courR14_tf);
        u8g2.drawStr(16,12, "Countdown: ");
        u8g2.setCursor(40,32);
        u8g2.print(x);
        u8g2.sendBuffer();                              
      }
      y = x;          
    }
    
    digitalWrite(signalPin, LOW);
    u8g2.clearBuffer();
    
    if (alarmSystem == 1){
      alarmSystem = 0; // Alarm turns off
      state = 0;
    }
    else{
      alarmSystem = 1; // Alarm turns on
      state = 0;     
    }    
  }
  
  else{
    while ( ledHigh < 5 ){
      Serial.println("Password is incorect!");
      u8g2.setFont(u8g2_font_courR10_tf);
      u8g2.drawStr(24,14, "False");
      u8g2.drawStr(24,30, "Password!");
      u8g2.sendBuffer();
      digitalWrite(signalPin, HIGH);
      delay(500);
      digitalWrite(signalPin, LOW);
      delay(500);
      ledHigh++;
    }
    counter = 0;
    ledHigh = 0;
  }
  
  u8g2.clearBuffer();
  clearData();  
}

void Event(){
  customKey = customKeypad.getKey();
  if (customKey == '*'){
    u8g2.clearBuffer(); 
    u8g2.setFont(u8g2_font_courR10_tf);
    u8g2.drawStr(8,10, "*pressed" );    
    u8g2.drawStr(8,22, "Typepassword!");
    u8g2.sendBuffer(); 
    counter = 1;
    tiempo2 = millis();

    unsigned long i = 10000; 
    tiempo2 = tiempo2 + i; 
  }

  while (counter == 1){    
    tiempo1 = millis();
    customKey = customKeypad.getKey(); 
    if (customKey){
      Data[data_count] = customKey; 
      data_count++; 
    }
    if(tiempo1 > tiempo2) {
    // A sentence where we check whether we have entered the password within 10 seconds after pressing the * key. 
	// If the password has not been entered within 10 seconds, the counter is reset to 0.
    // This means that the alarm system is switched off.      
      counter = 0;
      Serial.print("Counter:");
      Serial.println(counter);
      Serial.println("tiempo1:");
      Serial.println(tiempo1);
      Serial.println("tiempo2:");
      Serial.println(tiempo2);           
    }
    if(data_count == Password_Length-1){PreverjanjeGesla();}
  }
}

void Event2(){

  u8g2.clearBuffer(); 
  u8g2.setFont(u8g2_font_courR10_tf);
  u8g2.drawStr(8,10, "*pressed");    
  u8g2.drawStr(8,22, "Typepassword!");
  u8g2.sendBuffer(); 
  counter = 1;
  tiempo2 = millis(); // in the variable we get the current time tiempo2

  unsigned long i = 10000; 
  tiempo2 = tiempo2 + i; // we add 10s to the tiempo, this time is later compared to tiempo1, whose time increases in the if statement (tiempo1> tiempo2)

  while (counter == 1){    
    tiempo1 = millis();
    customKey = customKeypad.getKey(); // When the * key has already been pressed, the following key presses up to length of six are recorded in Data.
    if (customKey){
      Data[data_count] = customKey; 
      data_count++; 
    }
    if(tiempo1 > tiempo2) {
    // A sentence where we check whether we have entered the password within 10 seconds after pressing the * key. If the password has not been entered within 10 seconds, the counter is reset to 0.
    // This means that the alarm system is switched off.  
      counter = 0;
      u8g2.clearBuffer(); 
      u8g2.setFont(u8g2_font_courR10_tf);
      u8g2.drawStr(2,10, "Passwordwasnot");    
      u8g2.drawStr(2,22, "typed in a timely manner");
      u8g2.sendBuffer();
      delay(3000);                      
    }
    if(data_count == Password_Length-1){PreverjanjeGesla();}
  }
} 

void clearData()
{
  while(data_count != 0)
  {
    Data[data_count--] = 0;
  }
  return;
}