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Modular Smart Home Automation System with Local Logic

HomeMaster is a modular smart home automation system with fully local operation and built-in logic in every module. Control lighting, heating, security, and energy systems without internet dependency.
Compatible with ESPHome and Home Assistant.

  • Works without internet or cloud  

  • Local logic on every module (fail-safe)  
  • Reliable wired communication between devices

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Modular smart home automation system with local control — HomeMaster

System architecture

HomeMaster is a distributed smart home automation system designed for reliable, local operation.

Unlike cloud-based systems, each module runs its own logic, ensuring that lighting, heating, and security continue working even if the controller or network is unavailable.

Deterministic Communication

RS-485 Modbus ensures stable, interference-resistant communication across all modules, even in electrically noisy environments.

Modular & Scalable

DIN-rail modules allow flexible expansion for I/O, lighting, energy monitoring, and sensors.

Local Logic (Fail-Safe)

Each module can operate independently and execute logic locally. Critical functions continue working even if the controller or network fails.

Fully Local Operation

All automation runs locally without cloud dependency. The system continues working even without internet or server connection.
HomeMaster distributed smart home architecture with RS-485 Modbus

News & Updates

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Our Products

Smart Home Controllers

MiniPLC

DIN-rail controller with 6 relays, I/O, temperature sensing, and display. Integrated AC/DC supply and RS-485 Modbus expansion.HomeMaster MiniPLC modular smart home controller for Home Assistant

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MicroPLC

Minimal DIN-rail controller built for modular automation. Controls RS-485 modules, reduces cost, and scales as needed.

HomeMaster MicroPLC compact ESPHome smart home controller

  

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Smart Home Modules for Lighting, Heating, Security, and Energy

Opentherm GatewayHomeMaster OpenTherm Gateway for smart boiler and heating control
Opentherm

Energy Metering

HomeMaster energy metering module for smart home power monitoring
ENM-223-R1

Energy & Monitoring

LED RGBCCT

HomeMaster LED RGBCCT controller for smart home lighting
RGB-621-R1

AC Dimmer

HomeMaster AC dimmer module for ESPHome smart lighting
DIM-420-R1

Stair LEDs

HomeMaster stair LED controller with motion-activated lighting
STR-3221-R1

Lighting & Dimming

Analog & RTD

HomeMaster analog input and RTD temperature sensor module
AIO-422-R1

Relay & Digital inputs

HomeMaster relay and digital input module for home automation
DIO-430-R1

Control & I/O


Water Meter & Leak

HomeMaster water meter and leak detection module for smart home
WLD-521-R1

Alarm Systems

HomeMaster alarm system module for local smart home security
ALM-173-R1

Safety & Detection

Smart Home Automation Guides & System Design

Learn how to build smart home systems using ESPHome and Home Assistant, design reliable automation, and create a fully local setup without cloud dependency. 

Explore system architecture, device configuration, and fail-safe design principles.

What Your Boiler Really Exposes over OpenTherm — a Full Register Scan 

 Read the full 0–255 OpenTherm register map of your boiler — including the undocumented OEM registers — with a read-only ESPHome scanner, entirely local, no cloud.

Learn more

4–20 mA to 0–10 V: Reading Industrial Wind Sensors with the AIO-422-R1

A small weather mast — wind speed, wind direction, PT100 temperature — wired into an AIO-422-R1 and read by a MicroPLC over RS-485 Modbus RTU. 

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 EU Compliance & Standards

Behind the scenes of HomeMaster's regulatory journey — EMC, LVD and RED conformity assessment, electrical-safety testing, and EU Declarations of Conformity for every module in the lineup.

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 Weather-Compensated Heating

Turn the factory OpenTherm Gateway config into a weather-compensated controller: the boiler's water temperature follows an outdoor-reset curve, gets trimmed by a room thermostat, and a relay opens the upper-floor zone

Learn more

About HomeMaster

European industrial automation company with 17+ years of experience.

Founded in Romania, we design and build reliable automation systems inspired by industrial standards — but adapted for modern smart homes and buildings.

Why can’t smart homes be as reliable as industrial systems — and as open as maker platforms?

HomeMaster combines both approaches:

industrial-grade reliability with open, developer-friendly technology.

We design and build every product in-house, focusing on:

  • Deterministic and reliable operation (RS-485 wired communication)
  • Fully local automation (no cloud dependency)
  • Developer-friendly integration (ESPHome & Home Assistant)
  • Full transparency (open schematics and firmware)
  • Zero vendor lock-in

Our systems are built to be stable, maintainable, and scalable — from small installations to complex automation projects.

Open Source & Documentation

All hardware and firmware are publicly available:

  • GitHub repository (firmware, schematics, examples)
  • ESPHome configurations (ready-to-use YAML)
  • Modbus documentation and module configuration
  • Integration examples for Home Assistant

👉 View Hardware, Firmware & Full Documentation on GitHub

HomeMaster open-source smart home hardware

Grow Your Smart Home Business

Join the HomeMaster Partner Program and build reliable, profitable smart home systems with an open automation platform.

Built for Professional Installations

Deliver professional smart home projects with an open automation platform designed for electrical contractors and system integrators.

✔Ready-to-use electrical cabinet designs, wiring diagrams and project templates

✔ Native Home Assistant & ESPHome integration with local control

✔ Industrial DIN-rail hardware designed for electrical cabinets

✔ Open architecture with no vendor lock-in

✔ Direct technical support from the engineers who build the platform


Join the Partner Program