How can I fix this problem occur in code

Other Hardware Displays
1

When I upload code then first "PASSWARD...?" is showing on lcd diaplay,but when i press any key on keypad then only "lcd.clear()" is done and code ask to enter one more key to enter in following code.
How I remove this bug so, I can enter password just after the "PASSWARD...?" word.

#include <LiquidCrystal.h>
#include <Keypad.h>
/* Display */
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};

Keypad customkeypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 1);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("PASSWARD...?");
}
void loop()
{
  while (1)
  {
    char customkey = customkeypad.getKey();
    if (customkey)
    {
      lcd.clear();
      break;
    }
  }

  while (1)
  {
    char customkey = customkeypad.getKey();
    if (customkey)
    {

      Serial.println(customkey);
      lcd.print(customkey);

      if (customkey == '#')
      {
        lcd.clear();
        break;
      }

    }
  }
}
2

Move the LCD clear command to setup().

3

What does this code do? Why did you put it there?

4

If I move their then my "password...?" word not print on lcd,
and delay is not solution for it...

5

this code get any key and
go into following code

6

Hi,
See if this code meets your needs.
I changed the keyboard setting to 3 because your keyboard is 4 rows x 3 columns.
const byte KEYPAD_COLS = 3;

#include <LiquidCrystal.h>
#include <Keypad.h>
/* Display */
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 3;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};
Keypad customkeypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);
//-------------------------------------------------------------
void setup() {
  Serial.begin(9600);
  lcd.begin(16, 1);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("PASSWARD...?");
}
//-------------------------------------------------------------
void loop()
{
  bool first = false;
  while (1)
  {
    char customkey = customkeypad.getKey();
    if (customkey)
    {
      if (first == false)
      {
        first = true;
        lcd.clear();
      }
      Serial.println(customkey);
      lcd.print(customkey);
      if (customkey == '#')
      {
        lcd.clear();
        break;
      }
    }
  }
}
8

Hi
???????

wokwi
wokwi1366×662 86.6 KB

9

thank you sir✌️

10

Okay, why does it clear the screen?

11

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