A simple circuit

code.ino

#include <Password.h>

#include <Wire.h>

#include <Key.h>
#include <Keypad.h>

#define trigPin_1 3 
#define echoPin_1 4

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

Password password = Password( "2004" );

long distanta;
int citit = 0;

int melody[] = {
  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
};

// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {
  4, 8, 8, 4, 4, 4, 4, 4
};


const byte numRows= 4;

const byte numCols= 4;

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

byte rowPins[numRows] = {13,12,11,10}; //Rows 0 to 3

byte colPins[numCols]= {7,6,5,2}; //Columns 0 to 

//initializes an instance of the Keypad class

Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);


void setup(){

  
pinMode(trigPin_1, OUTPUT); 
        pinMode(echoPin_1, INPUT);
        pinMode(8,INPUT);
        pinMode(9,OUTPUT);
        Serial.begin(9600);
}

void loop(){

  char keypressed = myKeypad.getKey();

if (keypressed != NO_KEY)

{

  password.append(keypressed);

  Serial.println( password.evaluate()?"true":"false" );

  if ((int) sizeof(password) > 3) {
    if (password.evaluate()?"true":"false" == false) {
      for (int thisNote = 0; thisNote < 8; thisNote++) {

      // to calculate the note duration, take one second divided by the note type.
      //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
      int noteDuration = 1000 / noteDurations[thisNote];
      tone(9, melody[thisNote], noteDuration);
  
      // to distinguish the notes, set a minimum time between them.
      // the note's duration + 30% seems to work well:
      int pauseBetweenNotes = noteDuration * 1.30;
      delay(pauseBetweenNotes);
      // stop the tone playing:
      noTone(9);
    }
    
      
      password.reset();
    } else {
      //password.reset();
  }

}
  
  citit=digitalRead(8);
  if(citit==0&&distanta<=30){
    
  }
      
    }else{
      digitalWrite(9,0);
    }
 long duratie;
          
     digitalWrite(trigPin_1, LOW);  
     delayMicroseconds(2);              
     digitalWrite(trigPin_1, HIGH); 
     delayMicroseconds(5);              
     digitalWrite(trigPin_1, LOW);  
     duratie = pulseIn(echoPin_1, HIGH); 
     distanta = duratie/58;
     //Serial.println(distanta+);
     }