Limiting the length of a password or number of characters for keypad

Projects Programming
1

Hello :blush:

I am having this code here :

if    //(keypad.key[i].stateChanged)  //case PRESSED: 
    (key == 'B')
    {
      if (input_password.length() > 0)
      {
        lcd.setCursor(input_password.length(), 1); // move cursor to the last added character
        lcd.print(' ');  // Replace it with a blank
        input_password.remove(input_password.length() - 1);
      } 
    }

I just want to limit the length of password to 3 digits and if we try to press after entering 3 digit
it ll simply not getting entered or displayed on screen

How to go for that ??

2

Create a variable to hold the count of characters entered. Increment the count each time a character is entered. If 3 or more, stop inputting from the keyboard until you need to enter another password. Then clear the count and start again.

Please post the whole program. Snippets are often less than helpful.

3

Thanks Sir . . But can you elaborate in the form of script required to add . . Just that part only

4

Please post the whole program.

5 
if(key == '#')  
    {
      lcd.setCursor(0,1);               
      lcd.print("   ");

                    
                    
                    if  (input_password == password_1)     
                    {
                       digitalWrite(13, 1);
                    }
else 
                                        { 
                                                  //Serial.println("password is incorrect, try again"); 
                                                  lcd.setCursor(0,1);
                                                  lcd.print("Denied");
                                                  delay(5);     
                                                 lcd.setCursor(0,1);   
                                                 lcd.print("      ");
        
                                              
                                                 }


                                            
                                                 
                            input_password = ""; // reset the input password
      
    }
else 
    {
      if(input_password.length() == 0) 
    {
        lcd.clear();
    }
      input_password += key; // append new character to input password string
      lcd.setCursor(input_password.length(), 1); // move cursor to new position
      lcd.print(key);
}
6

As asked, please post the COMPLETE program.

Before copying from the IDE, please use tools -> autoformat in the IDE; your indentations seem to be all over the show.

7

Please post the whole program.

Use the IDE autoformat tool (ctrl-t or Tools, Auto format) before posting code in code tags.

8

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