password for each user

Using Arduino Project Guidance
1

I am currently making a project which involves the need for a password for each user. Once the user inputs their password, the LCD would display their name. Can you help me on how this could be implemented?

2

I can help with that. See attachment below.

Added:
I just made this sketch, it shows how you can use a LCD with the library. Note, I have a I2C lcd, so you may need to change a few things if you have a regular lcd.

#include <NewPasswordV2.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20,20,4);

NewPasswordV2 Mypass;

char Name[10]= {NULL};
char Pword[5] = {'\0'};
char data;

void setup(){
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  Serial.begin(9600);
  Mypass.Init(5); // how long will the password be + null terminator.
  Mypass.AddPassword("1234","Andy");
  Mypass.AddPassword("abcd","Joe");
  Mypass.AddPassword("ASDF","John");
  Mypass.AddPassword("8520","Sam");
  Mypass.AddPassword("1111","Mike");
}

void loop() {
  lcd.setCursor(0,0);
  if(Serial.available() > 0 ){
    data = Serial.read();
    strncpy(Pword, Mypass.EnterData(data),  sizeof(Pword));
   
    switch( Mypass.Check(Pword) )
    {
    case 1:
      lcd.clear();
      lcd.print("Password was found: ");
      lcd.setCursor(0,1);
      lcd.print(Mypass.CheckUser());
      //lcd.println();  
      break;

    case 0:
      lcd.clear();
      lcd.print("Password not found ");
      EnterNewPassword(); // Comment this out if you do not want to add new passwords
      break;   
    }
  }
}

void EnterNewPassword()
{ 
  lcd.setCursor(0,1);
  lcd.print("Store it? Y | N: ");
  while(1)
  {
    if(Serial.available() > 0 )
    {
      char choice = Serial.read();
      if(choice == 'y' || choice == 'Y')
      {
        lcd.print(choice);
        lcd.setCursor(0,2);
        lcd.print("Enter name.");
        int cnt = 0;
        while(1)
        {
          if(Serial.available() > 0 )
          {
            char name = Serial.read(); 
            if(name == '.' || cnt > 9) break;
            else
            {
              Name[cnt++] = name;
              Name[cnt] = '\0';
            }
          }
        }
        Newpassword(Pword,Name);
        break;
      }
      else{
        lcd.print(choice); 
        break;
      }
      break;
    }
  }
}

void Newpassword(char * New_Pass, char * New_U)
{
  Mypass.AddPassword(New_Pass, New_U);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Password was added: ");
}

NPV2.zip (2.69 KB)