How do I get rid of "ENTER PASSWORD" after entering the first character?

Projects Programming
1 
#include <Keypad.h>
#include <Servo.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
int position = 0;
char password[5] = "1234";
char input[5];
bool canType = true;

const byte rows = 4;
const byte cols = 4;

char keys[rows][cols] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

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

Keypad customKeypad = Keypad(makeKeymap(keys), rowPins, colPins, rows, cols);

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.print("ENTER PASSWORD");
}

void loop() {
  char key = customKeypad.getKey();

  if (key && position < 4 && canType) {
    if (key == '#') {
      lcd.clear();
      lcd.print("ENTER PASSWORD");
      position = 0;
    } else {
      lcd.setCursor(position, 0);
      lcd.print(key);
      input[position] = key;
      position++;
    }
  }

  //Checking
  if (position == 4) {
    canType = false;
    delay(1000);
    lcd.clear();
    position = 0;
    if (strcmp(input, password) == 0) {
      lcd.print("CORRECT");
    } else {
      lcd.print("WRONG");
    }
    delay(2000);
    lcd.clear();
    lcd.print("ENTER PASSWORD");
    canType = true;
  }
}
2

By using lcd.clear () when you accept the first character

4

I tried adding typed variable that gets added by 1 before showing it to display unlike position variable. So I checked if typed is equal to 1. If it is I cleared lcd, but it cleared the first character as well.

5

So, you put the code you didn't post in the wrong place.
You already have a variable that tells you if you've accepted a character or not
Why didn't you use that?

6

i think i commented on your code already in some other post

why not just do a lcd.clear when position == 0 in your code that recognizes a keypress, instead of checking for '#'.

7

Oh yeah. I cleared lcd after checking if position is equal to 1. Then cleared it and printed the first array element so it actually shows up after clearing.

8

but I need to clear lcd when i press #

9

my mistake. so add another case for position == 0

may make sense to have a sub-function the resets the display for a new password that is called in setup(), for '#' and after a password is entered, rather than have duplicate code in 3 places.

that sub-function can also reset position to zero

and why is there a delay preceding processing of the password? there's a delay afterwards

10

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