Entering password while countdown

Projects Programming
1

Hi, everyone I am new to Arduino and programing. I am working on a small project. I am making small security system consistPreformátovaný text of arduino mega 2560, lcd display, keypad, pir and door sensor, and some LEDs and buzzer. Everything works quite fine but I have one problem.
I would like to enter password to disable the system after motion detection while countdown before buzzer occur, but I dont know how to code it. Is there anybody who could help me figure it out?

Here is my code:

#include <Wire.h>                           
#include <LiquidCrystal_I2C.h>             
#include <Keypad.h>
                                 
int PIR = 10;
int MagKont = 24;
int buzzer = 12;           
int ledR = 22;
int ledG = 23;

const byte ROWS = 4;                
const byte COLS = 4;                
char keypressed;                   
char keyMap[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 myKeypad = Keypad(makeKeymap(keyMap), rowPins, colPins, ROWS, COLS);          

const int en = 2, rw = 1, rs = 0, d4 = 4, d5 = 5, d6 = 6, d7 = 7, bl = 3;          
const int i2c_addr = 0x27;                                                           
LiquidCrystal_I2C lcd(i2c_addr, en, rw, rs, d4, d5, d6, d7, bl, POSITIVE);            

String password = "2580";                
String tempPassword;                  
int screenOffMsg =0;
boolean activated = false;                   
boolean activateAlarm = false;             
boolean alarmActivated = false;             
boolean enteredPassword;                    

void setup() {
  lcd.begin(16, 2);
  pinMode(PIR, INPUT);
  pinMode(MagKont, INPUT);
  pinMode(buzzer, OUTPUT);               
  pinMode(ledR, OUTPUT);
  pinMode(ledG, OUTPUT);

}

void loop() {
  if (activateAlarm) {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Alarm bude");
    lcd.setCursor(0,1);
    lcd.print("aktivovany za:");

    int countdown = 9;
    while (countdown !=0) {
      lcd.setCursor(15,1);
      lcd.print(countdown);
      countdown--;
      tone(buzzer, 700, 100);
      delay(1000);
    }
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Alarm aktivovany");
    lcd.setCursor(7,1);
    lcd.print("!!!!");
    digitalWrite(ledG, HIGH);
    activateAlarm = false;
    alarmActivated = true;
  }
  if (alarmActivated == true) {
    int pir = digitalRead(PIR);
    int doorSensor = digitalRead(MagKont);

    if (pir == HIGH) {
      lcd.clear();
      enterPassword();
    }
    else if (doorSensor == HIGH) {
      lcd.clear();
      enterPassword();
    }
  }

  if (!alarmActivated) {
    if (screenOffMsg == 0) {
      lcd.clear();
      lcd.setCursor(5,0);
      lcd.print("Vitajte!");
      lcd.setCursor(0,1);
      lcd.print("Pre aktivaciu= A");
      screenOffMsg = 1;
    }
    keypressed = myKeypad.getKey();
    if (keypressed == 'A') {
      tone(buzzer, 1000, 200);
      activateAlarm = true;
    }
  }
}

void enterPassword() {
    int k=10;
    tempPassword = "";
    activated = true;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Alarm za:");
    lcd.setCursor(0,1);
    lcd.print("Zadaj pin:");
   
    int countdown = 9;
    while (countdown !=0) {
      lcd.setCursor(15,0);
      lcd.print(countdown);
      countdown--;
      tone(buzzer, 700, 100);
      delay(1000);
  }
   lcd.clear();
   lcd.setCursor(4,0);
   lcd.print("Alarm!");
   lcd.setCursor(0,1);
   lcd.print("Zadaj pin:");
   digitalWrite(buzzer, HIGH);
   digitalWrite(ledG, LOW);
   digitalWrite(ledR, HIGH);
    
   while(activated) {
    keypressed = myKeypad.getKey();
    if (keypressed != NO_KEY){
        if (keypressed == '0' || keypressed == '1' || keypressed == '2' || keypressed == '3' ||
            keypressed == '4' || keypressed == '5' || keypressed == '6' || keypressed == '7' ||
            keypressed == '8' || keypressed == '9' ) {
          tempPassword += keypressed;
          lcd.setCursor(k,1);
          lcd.print("*");
          k++;
       }
     }
    if (k > 14 || keypressed == '#') {
      tempPassword = "";
      k=10;
      lcd.clear();
      lcd.setCursor(4,0);
      lcd.print("Alarm!");
      lcd.setCursor(0,1);
      lcd.print("Zadaj pin:");
    }
    if (keypressed == '*') {
      if (tempPassword == password) {
        activated = false;
        alarmActivated = false;
        digitalWrite(ledR, LOW);
        digitalWrite(buzzer, LOW);
        digitalWrite(ledG, HIGH);
        screenOffMsg = 0;
      }
      else if (tempPassword != password) {
        lcd.setCursor(0,0);
        lcd.print("Zly pin!");
        lcd.setCursor(0,1);
        lcd.print("Zadaj znova!");
        delay(2000);
        lcd.clear();
        lcd.setCursor(4,0);
        lcd.print("Alarm!");
        lcd.setCursor(0,1);
        lcd.print("Zadaj pin:");
      }
    }
  }
}
2

use non blocking code and possibly a state machine.

Look at Using millis() for timing. A beginners guide and Several things at the same time

1 Like
3

Your sketch can't do anything else while you are doing this countdown. Use millis() instead of a while loop and delay() to do the timing:

  static int countdown = 9;
  static unsigned long countTime = 0;

  if (countdown != 0 && millis() - countTime >= 1000)
  {
    countTime = millis();
    lcd.setCursor(15, 1);
    lcd.print(countdown);
    countdown--;
    tone(buzzer, 700, 100);
  }
1 Like
4

Thanks you guys! I figure it out with your help :slight_smile:

5

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