eBUS Adapter Shield v5 provides an interface to a 2-wire eBUS with galvanic isolation and thus enables communication with an eBUS enabled heating, ventilation or solar system.

It is the continuation of previous designs with a significantly smaller footprint (37x26mm), pluggable eBUS connection, on-board WIFI by using an ESP32-C3, support for different Ethernet modules, and many more features.

Please also check the successor product eBUS Adapter Shield C6 with extended capabilities and better availablity.

Please refer to the documentation page for all details: adapter.ebusd.eu/v5

This interface was born to life early 2023 after several rounds of prototyping and is already in use by many people. Since then, multiple design optimizations were performed including an eFuse for over voltage+current protection.

Features

Full galvanic isolation with zero power drawn from eBUS (class 0 as of eBUS specification)
Flexible host connection via:
- USB (builtin)
- WIFI (builtin) with onboard PCB antenna
- directly pluggable onto a Raspberry Pi
- Ethernet (with addon module USR-ES1)
Full support for ebusd enhanced protocol
Web-based configuration and updatability by free-of-cost firmware
Optional connection to sensors
Optimized and built for use with ebusd

Specifications

PCB: 4-layer SMD+THT, HASL lead free
Chip: ESP32-C3 with onboard antenna
Host/Power connector: Micro-USB (cable available as option)
eBUS connector: pluggable 3.5 mm (plug included), polarization does not matter
Dimension: 37mm x 26mm (without antenna/connectors), 53mm x 26mm (with antenna+plugged in eBUS connector)
Operating voltage: 5V
Operating current: <120mA with WIFI
Protection: eFuse for over voltage and current protection
Testing/QA: every adapter is fully tested under real conditions with an eBUS power source