Fusion Chime Vision is an open-source smart doorbell system comprised of three items, each powered by an ESP32 WiFi and Bluetooth MCU: a doorbell based on the ESP32-CAM board, a 2.4-inch display, a microphone, and a speaker; a smart chime with a 0.96 OLED and a speaker; and an indoor display with a 3.5-inch IPS LCD, a speaker, and a microphone.
Fusion Chime Vision doorbell
Specifications:
- ESP32-CAM board
- SoC – ESP32 microcontroller
- CPU – Dual-core Tensilica LX6 @ up to 240 MHz
- Memory – 520 KB SRAM
- Wireless 802.11 b/g/n WiFi 4, Bluetooth 4.2
- Memory – 4MBit PSRAM
- Storage – 32Mbit SPI flash, microSD card slot
- Antenna – PCB antenna, u.FL connector
- SoC – ESP32 microcontroller
- Display – 2.4-inch TFT LCD, 240×320 resolution
- Camera – OV5640 Camera
- Audio
- Microphone for visitor voice capture and two-way audio communication (half-duplex)
- Speaker for two-way communication (half-duplex)
- Wireless
- WiFi from ESP32 for web access and connection to the indoor display panel
- 433 MHz RF RX/TX module
- Sensors – PIR motion
- Misc
- Metallic button with LED for doorbell press
- Screw terminals for connecting doorbell wires to the wall
- Mounting: Snap-Fit Mounting Bracket, Screws, or Double-Sided Tape
- Power Supply
- 12V-24V AC (standard doorbell transformer)
- Phase-sharing design allows continuous operation
- Dimensions – TBD; Weather-resistant enclosure, designed for outdoor use
The small display provided basic information about the Wi-Fi connection, whether a visitor is detected, SD card capacity status, IP address, etc… There’s no USB port, and programming/firmware flashing is done over WiFi (OTA).
Smart Chime
Specifications:
- Based on the HW-463 board with an ESP32-WROOM-32 WiFi and Bluetooth module
- Display – 0.91-inch OLED, 128×64 resolution for status feedback
- Audio – Speaker for custom chime sounds
- Wireless
- WiFi from the ESP32 board for web interface access
- 433 MHz RF RX module
- USB – 1x USB Type-C port for programming
- Misc
- Power on/off switch
- Mounting: screws or double-sided tape
- Power Supply – 12V-24V AC (standard doorbell transformer)
It can be programmed over USB-C or WiFi (OTA).
Fusion Chime Vision Display
Specifications:
- Based on the HW-463 board with an ESP32-WROOM-32 WiFi and Bluetooth module
- Display – 3.5-inch capacitive touchscreen IPS LCD with 480×320 resolution
- Audio
- Microphone for two-way audio communication (half-duplex)
- Speaker for two-way communication (half-duplex) and playing customized chime sounds
- Wireless
- Wi-Fi from ESP32
- 433 MHz RF RX/TX module (TX for automations like door locks or home devices, RX for receiving doorbell button press data)
- USB – USB Type-C port for programming and power
- Expansion – 2.54mm pitch GPIO header
- Misc – Mounting: snap-fit mounting bracket, screws, or double-sided tape
- Power Supply – 5V via USB Type-C port
Like the Chime, the Display can be programmed over USB or WiFi.
Wiring and resources
The diagram below shows the internal design of each device and how they are connected.
Netherlands-based FusionXvision says the Chime Vision has a fully open-source firmware. However, none of that is available now, and they plan to release schematics, 3D models (STL format), Tinkercad design, and resources enabling integration with home automation projects, new chime sounds, and other features.
It’s not the first ESP32 video doorbell we’ve covered, but it was a DIY doorbell based on the ESP32-CAM board with ESPHome firmware, while the Fusion Chime Vision is ready to use and offers a more complete solution with a chime and a display, and is compatible with commercial wired doorbells. The video and audio quality will, however, not be quite as good as commercial solutions. Sadly, we can’t check that by ourselves, as the video embedded below only provides an overview of the three devices, without any actual demo…
The Fusion Chime Vision smart doorbell solution has just launched on Crowd Supply with a $18,750 funding goal. Three rewards are available: the Chime for $59, the Display for $74, and the doorbell itself for $89. Somehow, there’s no bundle with all three, so you just have to pick the one you need. Shipping is free to the US and adds $12 (per item?) for the rest of the world. Deliveries are scheduled to start by mid-January 2026.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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Nice that it is open-source but it would have been more interesting if it was instead done using only ESPHome firmware and integrated into Home Assistant similar to that DIY doorbell.
Not bad at all, I was thinking making something similar (at least the part with the button) and connect it to my Home Assistant but using a radar sensor, no screen and ESP32-s3-cam. My only concerns were the power supply is AC but seems the basic schematics explains how to use it correctly (and to not overload the whole building entrance system)
Don’t build this with an ESP32, use an RV1106 or RV1109 instead. ESP32 can’t do h.264 encode and the Rockchip processors can. Here’s an RV1106 board for $12. https://www.cnx-software.com/2024/02/29/luckfox-pico-pro-pico-max-rockchip-rv1106-boards-100m-ethernet-5mp-camera/
Yeah.. sure.. but why use Linux for a doorbell system? Seems very complex and, frankly, risky, as it is a lot harder to build a safe and hardened Linux dist, than an embedded firmware binary.
In not saying this particular fw is safe, because i haven’t looked at it, but it is a lot simpler to make it safer.
Rockchip offers bare metal libraries too if you are a glutton for punishment.
The larger point here is that the ESP can’t do h.264 encode, and unencoded video is HUGE.
Esp32-p4 solves this problem 🙂
Esphome support is currently experimental, but it supports h264 natively.