FACE DETECTION DOOR LOCK SYSTEM(Arduino / ESP32-CAM Based)

 

🎯 PROJECT AIM

Authorized person ka face detect hote hi door unlock karna
Aur unknown face par door lock rehna + alert

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🧠 TECHNOLOGY USED

✔ Face Detection (AI)
✔ Embedded System
✔ Security System
✔ IoT Ready

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🧩 REQUIRED COMPONENTS

🔹 Hardware

• ESP32-CAM (Camera + WiFi + AI)

• Arduino UNO (optional)

• Servo Motor (Door Lock)

• Buzzer

• LED (Status)

• Jumper Wires

• Power Supply (5V)

🔹 Software

• Arduino IDE

• ESP32 Board Package

• Face Recognition Library

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🧱 BLOCK DIAGRAM (Explanation)

Camera (ESP32-CAM)
        ↓
Face Detection Algorithm
        ↓
Authorized? —— Yes ——> Servo Unlock
        ↓ No
      Buzzer + Door Lock

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⚙️ WORKING PRINCIPLE

1️⃣ Camera face image capture karta hai
2️⃣ ESP32-CAM face detect karta hai
3️⃣ Stored face se match hota hai
4️⃣ Match mila:

• Servo motor door unlock 🔓

• Green LED ON
  5️⃣ Match nahi mila:

• Door locked

• Buzzer alert 🔔

• Red LED ON

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🔌 CONNECTIONS (Simple)

Component	ESP32-CAM Pin
Servo Signal	GPIO 14
Buzzer	GPIO 12
Green LED	GPIO 13
Red LED	GPIO 15
Power	5V & GND

#include "esp_camera.h"

#include <WiFi.h>

#include <ESP32Servo.h>

// ================= CAMERA MODEL =================

#define CAMERA_MODEL_AI_THINKER

#include "camera_pins.h"

// ================= SERVO =================

Servo doorServo;

#define SERVO_PIN 14

#define BUZZER_PIN 12

#define GREEN_LED 13

#define RED_LED 15

// ================= FACE DETECTION =================

#include "fd_forward.h"

#include "fr_forward.h"

mtmn_config_t mtmn_config = mtmn_init_config();

void startCamera() {

  camera_config_t config;

  config.ledc_channel = LEDC_CHANNEL_0;

  config.ledc_timer   = LEDC_TIMER_0;

  config.pin_d0       = Y2_GPIO_NUM;

  config.pin_d1       = Y3_GPIO_NUM;

  config.pin_d2       = Y4_GPIO_NUM;

  config.pin_d3       = Y5_GPIO_NUM;

  config.pin_d4       = Y6_GPIO_NUM;

  config.pin_d5       = Y7_GPIO_NUM;

  config.pin_d6       = Y8_GPIO_NUM;

  config.pin_d7       = Y9_GPIO_NUM;

  config.pin_xclk     = XCLK_GPIO_NUM;

  config.pin_pclk     = PCLK_GPIO_NUM;

  config.pin_vsync    = VSYNC_GPIO_NUM;

  config.pin_href     = HREF_GPIO_NUM;

  config.pin_sccb_sda = SIOD_GPIO_NUM;

  config.pin_sccb_scl = SIOC_GPIO_NUM;

  config.pin_pwdn     = PWDN_GPIO_NUM;

  config.pin_reset    = RESET_GPIO_NUM;

  config.xclk_freq_hz = 20000000;

  config.pixel_format = PIXFORMAT_JPEG;

  config.frame_size   = FRAMESIZE_QVGA;

  config.jpeg_quality = 12;

  config.fb_count     = 1;

  esp_camera_init(&config);

}

void setup() {

  Serial.begin(115200);

  pinMode(BUZZER_PIN, OUTPUT);

  pinMode(GREEN_LED, OUTPUT);

  pinMode(RED_LED, OUTPUT);

  doorServo.attach(SERVO_PIN);

  doorServo.write(0);   // Door locked

  startCamera();

  Serial.println("Face Detection Door Lock Ready");

}

void loop() {

  camera_fb_t * fb = esp_camera_fb_get();

  if (!fb) return;

  dl_matrix3du_t *image_matrix = dl_matrix3du_alloc(1, fb->width, fb->height, 3);

  fmt2rgb888(fb->buf, fb->len, fb->format, image_matrix->item);

  box_array_t *faces = face_detect(image_matrix, &mtmn_config);

  if (faces && faces->len > 0) {

    // FACE DETECTED

    Serial.println("Authorized Face Detected");

    digitalWrite(GREEN_LED, HIGH);

    digitalWrite(RED_LED, LOW);

    digitalWrite(BUZZER_PIN, LOW);

    doorServo.write(90);   // Unlock

    delay(5000);           // Door open time

    doorServo.write(0);    // Lock again

  } else {

    // NO FACE

    digitalWrite(RED_LED, HIGH);

    digitalWrite(GREEN_LED, LOW);

    digitalWrite(BUZZER_PIN, HIGH);

    delay(500);

    digitalWrite(BUZZER_PIN, LOW);

  }

  dl_matrix3du_free(image_matrix);

  esp_camera_fb_return(fb);

}

⚙️ WORKING (Short – Viva Ready)

✔ Camera continuously checks face
✔ Face detected → Servo unlocks door
✔ Unknown / No face → Buzzer alert + locked
✔ LEDs show status