IoT Doorbell

IoT Doorbell

Image: Electric doorbell.JPG by Dmitry G via Wikimedia Commons, CC BY-SA 3.0

How It Works

• A push button at the door, wired to an ESP8266/ESP32, is monitored continuously for a press.
• On a press, the microcontroller sends a push notification (via a service like IFTTT, Blynk, or a custom app) to the resident's registered phone over Wi-Fi.
• If a camera module (e.g. ESP32-CAM) is included, it captures and attaches a snapshot of the visitor at the same moment as the notification.
• A local chime/buzzer can still ring at the door too, so the system works as a doorbell even when no one's carrying their phone.

Components

ESP8266 or ESP32 (ESP32-CAM for the camera variant)
Push button
Buzzer/chime (local doorbell sound)
Notification service (IFTTT/Blynk) or custom app backend

Applications

• Home security and visitor notification
• Small offices and apartment entryways
• Remote-property visitor logging

Advantages

• Notifies the resident anywhere with Wi-Fi/mobile data, not just within earshot of the chime
• Optional camera snapshot gives a visual record of who visited
• Local chime still works even if the network is briefly down

Sample Code — Button Press to Push Notification

// Simplified IoT doorbell - ESP8266
#include 
#include 
int buttonPin = D2;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  WiFi.begin("SSID", "PASSWORD");
}

void loop() {
  if (digitalRead(buttonPin) == LOW) { // button pressed
    HTTPClient http;
    http.begin("https://maker.ifttt.com/trigger/doorbell/with/key/YOUR_KEY");
    http.GET(); // triggers push notification via IFTTT
    http.end();
    delay(3000); // debounce / avoid repeat triggers
  }
}

Related Research

• Smart Doorbell Using ESP32 Cam/ESP-Eye and Blynk with Object Recognition Using YOLO — IJISRT