• Author: Joita Anca-Stefania
• E-mail: anca_stefania.joita@stud.etti.upb.ro
• Master: ACES
• Source code, demo and PPT:

The motivation of this project is to implement a device that improves an usual doorbell.

When a visitor at the door presses the doorbell button, the device will send a notification the owner's phone with a link to the video streaming page where the owner can see the person at the door from anywhere in the world.

The owner can choose to answer the visitor with a few pre-recorded voice responses which are played through the doorbell, such as “Someone is coming at the door”, “No one can come at the door”, “Someone is coming to the door in 5 minutes”.

For the hardware part, an ESP32-CAM module is used for sending the live video stream. For transmitting the pre-recorded responses, I will use a DF-Player mini with a microSD card and a speaker.

The doorbell is controlled through Home Assistant, along with ESPHome.

For creating the doorbell, I used the following components:

• ESP32-CAM - module that integrates Wi-Fi and Bluetooth
• OV2640 Camera - supports up to 15 fps of video in UXGA(1632×1232) resolution
• DFPlayer Mini and microSD Card - supports MP3, WAV and WMA files
• USB to TTL RS232 Converter UART CH340 - used to upload the flash code to ESP32-CAM module
• Speaker
• Push button
• Green LED
• Resistor - 470 Ω

In order for the Doorbell to work as expected, the software configuration created is shown in the figure below:

• Home Assistant - Open-source platform used for automating the application by controlling it remotely through the phone application
• ESPHome - Open-source platform used for creating the firmware of the application and automating the entire behaviour of the Smart Doorbell
• WSL2 - Hyper-V virtual machine for configuring the Home Assistant Core

I successfully configured Home Assistant with Nabu Casa Cloud, ensuring accessibility and control of the Smart Doorbell from the web browser and mobile phone as well. In this project, Home Assistant is used for receiving the notification with the live camera stream whenever someone presses the doorbell and to answer the doorbell with the desired response.