#include <Keypad.h>
#include <EEPROM.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <HTTPClient.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* token = "u9kXU"; 
int Button=4;
int Button1=18; 
int Lock = 23; 
const byte numRows= 4; 
const byte numCols= 4; 
int buzzerPin = 15;
char keymap[numRows][numCols]=
{
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
char keypressed; 
char code[]= {'1','2','3','4'}; 
char check1[sizeof(code)]; 
char check2[sizeof(code)]; 
short a=0,i=0,s=0,j=0; 
byte rowPins[numRows] = {13,12,14,27}; 

byte colPins[numCols]= {26,25,33,32}; 
Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows,
numCols);
LiquidCrystal_I2C lcd(0x27, 16, 2); 
void setup()
{
lcd.init(); 
lcd.backlight();
lcd.print("CircuitSchools");
lcd.setCursor(0,1);
lcd.print("Password Lock");
delay(2000);
lcd.clear();
lcd.print("* to unlock");
lcd.setCursor(0,1);
lcd.print("B to lock");
delay(2000);
lcd.clear();
lcd.print("Press* to unlock"); 

pinMode(Button,INPUT);
pinMode(Button1,INPUT);
pinMode(Lock, OUTPUT);
for(i=0 ; i<sizeof(code);i++){ 
 
 EEPROM.get(i, code[i]); 
 }
 Serial.begin(9600);
 WiFi.begin("Wokwi-GUEST", "", 6);
 while (WiFi.status() != WL_CONNECTED) {
 delay(1000);
 Serial.println("Connecting to WiFi...");
 }
 }
 void loop()
 {
 keypressed = myKeypad.getKey();

 if (keypressed == '*'){
 playTone(1000, 100); 
 lcd.clear();
 lcd.setCursor(0,0);
 lcd.print("Enter code"); 
 ReadCode(); 
 if (a==sizeof(code)) 
 OpenDoor(); 

 else{
 playTone(300, 100);
 lcd.clear();
 lcd.print("Wrong code"); 
 lcd.setCursor(0,1);
 lcd.print("Press * to Unlock");
 }
 delay(2000);
 lcd.clear();
 lcd.print("Standby"); 
 }
 if(keypressed == '#'){
 playTone(1000, 100); 
 ChangeCode();
 lcd.clear();
 lcd.print("Standby"); 
 lcd.setCursor(0,1);
 lcd.print("Press * to Unlock");
 }
 if(digitalRead(Button)==HIGH){ 
 digitalWrite(Lock, HIGH);
 OpenDoor();
 }
 if(digitalRead(Button1)==HIGH){ 
 lcd.clear();
 digitalWrite(Lock, LOW);
 lcd.print("Locked: Press * to ");
 lcd.setCursor(0,1);
 lcd.print("to unlock!!");
 }
 if(keypressed == 'B'){ 

 lcd.clear();
 digitalWrite(Lock, LOW);
 lcd.print("Locked: Press * to ");
 lcd.setCursor(0,1);
 lcd.print("to unlock!!");
 }
 }
 void ReadCode(){ 
 i=0;
 a=0;
 j=0;
 while(keypressed != 'A'){ 
 keypressed = myKeypad.getKey();
 playTone(1000, 100);
 if(keypressed != NO_KEY && keypressed != 'A' ){ 
 lcd.setCursor(j,1); 

 lcd.print("*");
 playTone(1000, 100);
 j++;
 if(keypressed == code[i]&& i<sizeof(code)){ 
 a++;
 i++;
 }
 else
 a--; 
 }

 }
 keypressed = NO_KEY;
 }
 void ChangeCode(){ 
 lcd.clear();
 lcd.print("Changing code");
 delay(1000);
 lcd.clear();
 lcd.print("Enter old code");
 ReadCode(); 

 if(a==sizeof(code)){ 
 lcd.clear();
 lcd.print("Changing code");
 GetNewCode1();
 GetNewCode2(); 
 s=0;
 for(i=0 ; i<sizeof(code) ; i++){ 
 if(check1[i]==check2[i])
 s++; 
 }
 if(s==sizeof(code)){ 
 for(i=0 ; i<sizeof(code) ; i++){
 code[i]=check2[i]; 
 EEPROM.put(i, code[i]); 

 }
 lcd.clear();
 lcd.print("Code Changed");
 playTone(1000, 1000);
 delay(2000);
 }
 else{ 
 lcd.clear();
 playTone(300, 100);
 lcd.print("Codes are not");
 lcd.setCursor(0,1);
 lcd.print("matching !!");
 delay(2000);
 }
 }
 else{ 
 lcd.clear();
 lcd.print("Wrong");
 delay(2000);
 }
 }
 void GetNewCode1(){
 i=0;
 j=0;
 lcd.clear();
 lcd.print("Enter new code"); 
 lcd.setCursor(0,1);
 lcd.print("and press A");
 delay(2000);
 lcd.clear();
 lcd.setCursor(0,1);
 lcd.print("and press A"); 
 while(keypressed != 'A'){ 
 keypressed = myKeypad.getKey();
 if(keypressed != NO_KEY && keypressed != 'A' ){
 playTone(1000, 100);
 lcd.setCursor(j,0);
 lcd.print("*"); 
 check1[i]=keypressed; 
 j++;
 }
 }
 keypressed = NO_KEY;
 }
 void GetNewCode2(){ 
 i=0;
 j=0;
 lcd.clear();
 lcd.print("Confirm code");
 lcd.setCursor(0,1);
 lcd.print("and press A");
 delay(3000);
 lcd.clear();
 lcd.setCursor(0,1);
 lcd.print("and press A");
 while(keypressed != 'A'){
 keypressed = myKeypad.getKey();
 playTone(1000, 100);
 if(keypressed != NO_KEY && keypressed != 'A' ){
 lcd.setCursor(j,0);
 lcd.print("*");
 check2[i]=keypressed;
 i++;
 j++;
 }
 }
 keypressed = NO_KEY;
 }
 void OpenDoor(){ 
 lcd.clear();
 lcd.print("Unlocked:Welcome");
 playTone(1000, 1000);
 digitalWrite(Lock,HIGH);
 if (WiFi.status() == WL_CONNECTED) {
 HTTPClient http;
 Serial.println("WiFi connect");
 http.begin("https://notify-api.line.me/api/notify");
 http.addHeader("Authorization", "Bearer " + String(token));
 http.addHeader("Content-Type", "application/x-www-form-urlencoded");
 http.POST("");
 Serial.println("");
 http.end();
 }
 }
 void playTone(int frequency, int duration) {
 tone(buzzerPin, frequency, duration);
 delay(duration);
 noTone(buzzerPin); 
 }