Circuit Diagram of Safe lock Project with Arduino

Code for Safe Lock with Arduino:

#define CLK 9   // Pin for CLK
#define DT 10    // Pin for DT
#define SW 11    // Pin for SW
#define Red_LED A2      // Pin for Red LED
#define Green_LED A3    // Pin for Green LED
#define buttonPin A4    // Pin for the button
#define Buzzer A5       // Pin for the buzzer

// Define Connections to 74HC595 Shift Register
const int dataPin = 6; // DS pin
const int latchPin = 7; // ST_CP pin
const int clockPin = 8; // SH_CP pin

// Define Connections to BCD
int a1 = 2;
int a2 = 5;
int a3 = 4;
int a4 = 3;

// Patterns for characters 0,1,2,3,4,5,6,7,8,9,
int datArray[16] = {B11111010, B01100000, B11011100, B11110100, B01100110, B10110110, B10111110, B11100000, B11111110, B11110110};

bool P_Mode = false;
int counter = 0;
int currentStateCLK;
int lastStateCLK;
int a = 0, b = 0, c = 0;
int p1 = 2, p2 = 4, p3 = 6;
int i = 0, Try = 3;
String currentDir = "";
bool flagbtn = true, flagclk = true;
bool Start = false, Unlock = false, state = true;
unsigned long prevmls, prevmlsG;

void setup() {
  // Setup Serial Monitor
  Serial.begin(9600);
  pinMode(a1, OUTPUT);
  pinMode(a2, OUTPUT);
  pinMode(a3, OUTPUT);
  pinMode(a4, OUTPUT);
  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT_PULLUP);
  pinMode(buttonPin, INPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(Red_LED, OUTPUT);
  pinMode(Green_LED, OUTPUT);
  pinMode(Buzzer, OUTPUT);
  // Read the initial state of CLK
  lastStateCLK = digitalRead(CLK);
  Turn_OFF_Display();
}

void loop() {
  Read_button(); // Check button status
  read_encoder(); // Read rotary encoder
  Update_display(a, b, c); // Update the display based on the selected digits
  Update_LEDs();  // Update the LEDs
}


//------------------------------------------------Status LEDs----------------------------
void Update_LEDs()
{
  if (Start == true)
  { if (P_Mode == false) {
      if (Unlock == true)
      { digitalWrite(Green_LED, HIGH);
        digitalWrite(Red_LED, LOW);
      }
      else
      { digitalWrite(Red_LED, HIGH);
        digitalWrite(Green_LED, LOW);
      }
    }
    else if (P_Mode == true)
    { digitalWrite(Red_LED, LOW);
      if (millis() - prevmlsG > 500)
      {
        state = !state;
        digitalWrite(Green_LED, state);
        prevmlsG = millis();
      }
    }
  }
}


//---------------------------------------------Reading Button--------------------------
void Read_button()
{
  if (digitalRead(buttonPin) == HIGH && flagbtn == true)
  { flagbtn = false;
    Start = !Start;
    prevmls = millis();
    if (Start == true)
    {
      for (int j = 0; j < 10; j++) // Display numbers 0-9 on the 7-segment display
      {
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, MSBFIRST, datArray[j]);
        shiftOut(dataPin, clockPin, MSBFIRST, datArray[j]);
        digitalWrite(latchPin, HIGH);
        disp1(j);
        delay(50);
      }
    }
  }
  else if (digitalRead(buttonPin) == LOW && flagbtn == false)
  { flagbtn = true;
    if (millis() - prevmls > 2000)
    { Start = true;
      P_Mode = !P_Mode;
      if (P_Mode == true)
        Serial.println("Password Mode Activated!");
      else
      { Serial.println("Password Mode Deactivated!");
        p1 = a;
        p2 = b;
        p3 = c;
        Serial.println((String)"\nNew Password Saved as: " + p1 + p2 + p3 + "\n");
        a = 0; b = 0; c = 0;
      }
    }
  }
}



//-------------------------------------------------Encoder---------------------------------------
void read_encoder()
{ if (Start == true)
  {
    currentStateCLK = digitalRead(CLK);

    if (currentStateCLK != lastStateCLK  && currentStateCLK == 1) {

      if (digitalRead(DT) != currentStateCLK) {
        // Encoder is rotating CW so increment
        counter ++;
        if (counter > 9)
          counter = 0;
        currentDir = "CW";
      }
      else {
        // Encoder is rotating CCW so increment
        counter --;
        currentDir = "CCW";
        if (counter < 0)
          counter = 9;
      }

      if (i == 0)
        a = counter;
      if (i == 1)
        b = counter;
      if (i == 2)
        c = counter;
      //    Serial.print("Direction: ");    Serial.print(currentDir);
      //    Serial.print(" | Counter: ");    Serial.println(counter);
    }

    // Remember last CLK state
    lastStateCLK = currentStateCLK;

    //If we detect LOW signal, button is pressed
    if (digitalRead(SW) == LOW && flagclk == true) {
      flagclk = false;
      Serial.println("Button pressed!");
      i++;
      if (i > 2)
      { i = 0;
        if (P_Mode == false) {
          if (p1 == a && p2 == b && p3 == c)
          {
            Unlock = true;
            Serial.println("Correct Password!");
            a = 0; b = 0; c = 0;
            digitalWrite(Buzzer, HIGH);
            delay(500);
            digitalWrite(Buzzer, LOW);
            delay(500);
          }
          else
          { digitalWrite(Red_LED, HIGH);
            digitalWrite(Green_LED, LOW);

            Serial.println("Wrong Password, Try Again!");
            for (int j = 0; j < 2; j++) {
              digitalWrite(Buzzer, HIGH);
              delay(300);
              digitalWrite(Buzzer, LOW);
              delay(300);
            }

            a = 0; b = 0; c = 0;
            Try--;
            Update_display(Try, Try, Try);
            delay(1500);
            if (Try == 0)
            {
              for (int k = 0; k < 10; k++)
              {
                digitalWrite(Buzzer, HIGH);
                delay(200);
                digitalWrite(Buzzer, LOW);
                delay(200);
              }

              Start = false;
              digitalWrite(Red_LED, LOW);
              digitalWrite(Green_LED, LOW);
            }
          }
        }
      }

      delay(500);
    }
    else if (digitalRead(SW) == HIGH && flagclk == false) {
      flagclk = true;
    }
  }
}



void disp1(int num) { //this method entails making 0-9 combinations using the BCD pins by sending different outputs to turn each segment on or off.
  if (num == 0) //0000
  {
    digitalWrite(a1, LOW);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(a4, LOW);
  }
  if (num == 1) //0001
  {
    digitalWrite(a1, HIGH);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(a4, LOW);
  }
  if (num == 2) //0010
  {
    digitalWrite(a1, LOW);//0
    digitalWrite(a2, HIGH);//1
    digitalWrite(a3, LOW);//0
    digitalWrite(a4, LOW);//0
  }
  if (num == 3) //0011
  {
    digitalWrite(a1, HIGH);//1
    digitalWrite(a2, HIGH);//1
    digitalWrite(a3, LOW);//0
    digitalWrite(a4, LOW);//0
  }
  if (num == 4) //0100
  {
    digitalWrite(a1, LOW);//0
    digitalWrite(a2, LOW);//0
    digitalWrite(a3, HIGH);//1
    digitalWrite(a4, LOW);//0
  }
  if (num == 5) //0101
  {
    digitalWrite(a1, HIGH);//1
    digitalWrite(a2, LOW);//0
    digitalWrite(a3, HIGH);//1
    digitalWrite(a4, LOW);//0
  }
  if (num == 6) //0110
  {
    digitalWrite(a1, LOW);//0
    digitalWrite(a2, HIGH);//1
    digitalWrite(a3, HIGH);//1
    digitalWrite(a4, LOW);//0
  }
  if (num == 7) //0111
  {
    digitalWrite(a1, HIGH);//1
    digitalWrite(a2, HIGH);//1
    digitalWrite(a3, HIGH);//1
    digitalWrite(a4, LOW);//0
  }
  if (num == 8) //1000
  {
    digitalWrite(a1, LOW);//0
    digitalWrite(a2, LOW);//0
    digitalWrite(a3, LOW);//0
    digitalWrite(a4, HIGH);//1
  }
  if (num == 9) //1001
  {
    digitalWrite(a1, HIGH);//1
    digitalWrite(a2, LOW);//0
    digitalWrite(a3, LOW);//0
    digitalWrite(a4, HIGH);//1
  }

}

//------------------------Function for turning of all the 7-Segments--------------------
void Turn_OFF_Display()
{
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, datArray[0]);
  shiftOut(dataPin, clockPin, MSBFIRST, datArray[0]);
  digitalWrite(latchPin, HIGH);
  disp1(0);
}

//-------------------------------------------Functino to update 7-Segments
void Update_display(int x, int y, int z)
{ if (Start == true) {
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, datArray[x]);
    shiftOut(dataPin, clockPin, MSBFIRST, datArray[y]);
    digitalWrite(latchPin, HIGH);
    disp1(z);

  }
}

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