# Video Intercom and Doorbell

[中文]

## Introduction

The video-intercom and doorbell solution runs camera capture, encode/decode, two-way calling, and a display on ESP32-S3 / ESP32-P4. Product forms include a peephole, door lock, doorbell, or care camera. The device captures the door or indoor scene and sends it over WebRTC, RTMP, RTSP, or SIP to a phone or indoor panel. Depending on the protocol, it provides remote video preview, video streaming, or two-way video intercom. Audio uses a 1-to-3-mic array with noise suppression and acoustic echo cancellation. Display interfaces include SPI, 8080, and RGB; the UI can use LVGL.

Product differences are mainly the camera interface (USB, DVP, or MIPI) and panel size. Software structure is similar for a lock, doorbell, and care camera.

            flowchart LR
        Cam["Camera"]
        Enc["Video codec"]
        Rtc["WebRTC / RTMP / RTSP / SIP"]
        Lcd["Video preview/two-way video intercom"]
        Cam --> Enc
        Enc --> Rtc
        Rtc --> Lcd

## Applications

- Home security: smart peephole, video doorbell, lock with a screen, and access control

- Care devices: infant or elder-care terminals for remote video preview and video intercom

- Home appliances: remote video preview and video intercom on pet feeders, indoor monitors, and similar devices

- Interactive toys: a toy or desktop robot with video calling

## Features

- Two-way video intercom and voice calling

- Transport over WebRTC, RTMP, RTSP, or SIP

- 1-to-3-mic arrays with noise suppression and acoustic echo cancellation

- SPI, 8080, or RGB panels for preview and a simple UI

- Wi-Fi keep-alive: ESP32-S3 standby can reach about 600 µA; ESP32-P4 current depends on the companion Wi-Fi chip

- Calls started from a phone app or mini program

## Hardware and software

Pick the SoC by resolution and codec: H.264 calling uses ESP32-P4; MJPEG up to 480×800 can use ESP32-S3, and higher resolutions can use ESP32-S31. The camera interface can be USB, DVP, or MIPI.

Real-time calling is in ESP-WebRTC Real-Time Communication Solution. H.264 and JPEG are in ESP H264 and ESP NEW JPEG. The audio front end is in ESP-SR. A doorbell example is doorbell_demo.

## References

- ESP-WebRTC Real-Time Communication Solution

- doorbell_demo

- ESP H264

- ESP NEW JPEG

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