ESP32-CAM Smart Doorbell with Camera & Notifications

/*********************************************************************
 * ESP32-CAM Smart Doorbell with Telegram Notifications
 * 
 * Features:
 * - Motion detection
 * - Photo capture on button press
 * - Telegram notifications with photo
 * - Buzzer alert
 * 
 * Hardware: ESP32-CAM, Relay, Push Button, Buzzer
 * 
 * Libraries Required:
 * - UniversalTelegramBot (install from Library Manager)
 * - ESP32 Camera (install from Library Manager)
 *********************************************************************/

#include 
#include 
#include 
#include "esp_camera.h"

// ============== WIFI CONFIGURATION ==============
const char* wifi_ssid = "YOUR_WIFI_SSID";
const char* wifi_password = "YOUR_WIFI_PASSWORD";

// ============== TELEGRAM CONFIGURATION ==============
#define BOT_TOKEN "YOUR_TELEGRAM_BOT_TOKEN"
#define CHAT_ID "YOUR_CHAT_ID"

WiFiClientSecure client;
UniversalTelegramBot bot(BOT_TOKEN, client);

// ============== PIN CONFIGURATION ==============
#define DOORBELL_BUTTON 14
#define RELAY_PIN 2
#define BUZZER_PIN 12
#define MOTION_SENSOR 13

// ============== CONFIGURATION ==============
#define FLASH_LED_PIN 4
bool doorbellState = false;
unsigned long lastMotionTime = 0;
const unsigned long MOTION_COOLDOWN = 5000; // 5 seconds

// ============== CAMERA PINS (AI-THINKER) ==============
#define PWDN_GPIO_NUM 32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 0
#define SDA_GPIO_NUM 26
#define SCL_GPIO_NUM 27
#define Y9_GPIO_NUM 35
#define Y8_GPIO_NUM 34
#define Y7_GPIO_NUM 39
#define Y6_GPIO_NUM 36
#define Y5_GPIO_NUM 21
#define Y4_GPIO_NUM 19
#define Y3_GPIO_NUM 18
#define Y2_GPIO_NUM 5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM 23
#define PCLK_GPIO_NUM 22

// ============== SETUP ==============
void setup() {
  Serial.begin(115200);
  Serial.println(F("\n======================================"));
  Serial.println(F("ESP32-CAM Smart Doorbell Starting..."));
  Serial.println(F("======================================"));
  
  // Configure pins
  pinMode(DOORBELL_BUTTON, INPUT_PULLUP);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(MOTION_SENSOR, INPUT);
  pinMode(FLASH_LED_PIN, OUTPUT);
  
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);
  digitalWrite(FLASH_LED_PIN, LOW);
  
  // Connect to WiFi
  connectToWiFi();
  
  // Initialize Camera
  initializeCamera();
  
  // Initialize Telegram
  client.setCACert(TELEGRAM_CERTIFICATE_ROOT);
  
  Serial.println(F("Setup complete!"));
  Serial.println(F("Doorbell is active. Press button or detect motion..."));
}

// ============== MAIN LOOP ==============
void loop() {
  // Check doorbell button
  if (digitalRead(DOORBELL_BUTTON) == LOW) {
    Serial.println(F("Doorbell pressed!"));
    triggerDoorbell();
    delay(1000);  // Debounce
  }
  
  // Check motion sensor
  if (digitalRead(MOTION_SENSOR) == HIGH) {
    if (millis() - lastMotionTime > MOTION_COOLDOWN) {
      Serial.println(F("Motion detected!"));
      triggerDoorbell();
      lastMotionTime = millis();
    }
  }
  
  delay(100);
}

// ============== FUNCTIONS ==============

void connectToWiFi() {
  Serial.print(F("Connecting to WiFi"));
  WiFi.begin(wifi_ssid, wifi_password);
  
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 30) {
    delay(500);
    Serial.print(F("."));
    attempts++;
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println(F(" Connected!"));
    Serial.print(F("IP Address: "));
    Serial.println(WiFi.localIP());
  } else {
    Serial.println(F(" Connection failed!"));
  }
}

void initializeCamera() {
  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_sscb_sda = SDA_GPIO_NUM;
  config.pin_sscb_scl = SCL_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
  
  // Init with high quality for face recognition
  config.frame_size = FRAMESIZE_SVGA;
  config.jpeg_quality = 10;
  config.fb_count = 2;
  
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf(F("Camera init failed with error 0x%x\n"), err);
    return;
  }
  
  Serial.println(F("Camera initialized successfully!"));
}

void triggerDoorbell() {
  Serial.println(F("=== DOORBELL TRIGGERED ==="));
  
  // Play buzzer sound
  playBuzzer();
  
  // Turn on flash LED
  digitalWrite(FLASH_LED_PIN, HIGH);
  delay(500);
  
  // Capture photo
  camera_fb_t *fb = esp_camera_fb_get();
  if (fb) {
    // Send photo to Telegram
    sendTelegramPhoto(fb->buf, fb->len);
    esp_camera_fb_return(fb);
  }
  
  // Turn off flash
  digitalWrite(FLASH_LED_PIN, LOW);
  
  Serial.println(F("Doorbell action complete!"));
}

void playBuzzer() {
  // Play doorbell sound
  for (int i = 0; i < 3; i++) {
    digitalWrite(BUZZER_PIN, HIGH);
    delay(200);
    digitalWrite(BUZZER_PIN, LOW);
    delay(100);
  }
}

void sendTelegramPhoto(uint8_t* image_data, size_t image_len) {
  Serial.println(F("Sending photo to Telegram..."));
  
  // Send notification first
  String message = "🔔 Someone is at your door!\nTime: " + String(millis()/1000) + "s ago";
  if (bot.sendMessage(CHAT_ID, message, "")) {
    Serial.println(F("Notification sent!"));
  }
  
  // Send photo
  if (bot.sendPhotoByBinary(CHAT_ID, "image/jpeg", image_len,
      []()(size_t buffer_len, uint8_t* buffer, size_t* idx, uint8_t* data, size_t len)->size_t {
        for (size_t i = 0; i < len; i++) {
          buffer[*idx + i] = data[i];
        }
        *idx += len;
        return len;
      }, nullptr, image_data)) {
    Serial.println(F("Photo sent successfully!"));
  } else {
    Serial.println(F("Failed to send photo"));
  }
}

// ============== END OF CODE ==============