DIN-rail smart home modules for Home Assistant and ESPHomeWired smart home that runs on its own
An open wired alternative to KNX: lights, heating, alarms and energy with local logic in every module, ESPHome pre-installed, in Home Assistant in minutes.
- 10countries with an installer
- 20countries with customers
- 0cloud accounts
- RS-485Modbus RTU bus
- Made for ESPHomeMiniPLC and OpenTherm Gateway
- CEmade in Romania
Know the price before you ask anyone
Describe your rooms and get the exact module list with live shop prices, the DIN-rail layout and the ESPHome bus configuration — in about a minute.
Prices are for HomeMaster modules. The configurator also lists the enclosure, protection, terminals and power supply for local sourcing.
How it works
One controller, one wired bus, a module for each job. Every module keeps its own logic.
DIO-430relays
DIM-420dimming
RGB-621LED strips
STR-3221stairs, floor heating
AIO-4220–10 V, PT100
ALM-173alarm inputs
WLD-521leaks, water
ENM-223energyLocal logic in every module
A wall switch drives its relay, a leak closes the valve, a meter sheds load — on the module itself, without a round trip to the server.
A wired bus in the cabinet
Modules sit on one RS-485 line in the distribution board. No batteries, no pairing, no Wi-Fi coverage to plan.
Home Assistant through ESPHome
The controller appears in Home Assistant with every input and output as a ready entity — no MQTT broker, no register mapping.
Standard Modbus RTU
The modules also work with openHAB, ioBroker, Node-RED, MQTT gateways and SCADA systems.
Products
Controllers and DIN-rail modules. Prices are live from the shop.
MiniPLC
ESP32 PLC on a DIN rail: 6 relays, 0–10 V, PT100/PT1000 and Ethernet in one housing.
MicroPLC
Compact ESP32 controller for the RS-485 bus, with one fail-safe relay and 1-Wire.
First batch December
Thermostat for OpenTherm
Wall thermostat with a 2.8″ screen, presence radar and room sensors.
OpenTherm Gateway
ESPHome OpenTherm gateway for the boiler, on a DIN rail, with external temperature probes.
RGB-621-R1
RGB+CCT LED controller, 5 PWM channels with 12-bit dimming.
DIM-420-R1
2-channel phase-cut AC dimmer with 4 inputs for wall switches.
STR-3221-R1
32 channels for LED stair lighting or underfloor heating zones.
DIO-430-R1
3 relays and 4 inputs with manual override buttons.
AIO-422-R1
4 × 0–10 V in, 2 × 0–10 V out, 2 × PT100/PT1000.
WLD-521-R1
Leak detection and water metering, 2 relays to close the valve.
ALM-173-R1
17 inputs for contacts and detectors, 3 relays, loop power.
ENM-223-R1
3-phase energy meter with 2 relays for local load shedding.
ISYSTEMS AUTOMATION · since 2007
Built by an industrial automation company
We have been building control systems for power plants and refineries in Ploiești, Romania since 2007 — automation that has to run around the clock. HomeMaster is what the same engineers build for a house.
- 2007founded
- 24/7plants running on our control systems
- In-housedesigned, assembled and tested in Romania
Guides and builds
Real projects with ESPHome and Home Assistant, step by step.
4–20 mA to 0–10 V: reading industrial wind sensors
A weather mast on an AIO-422-R1 and a MicroPLC over Modbus RTU.
Read →
What your boiler exposes over OpenTherm
A full 0–255 register scan, read-only, entirely local.
Read →
Weather-compensated heating
Boiler water temperature follows the outdoor curve, trimmed by the room.
Read →
KNX, Modbus panel or a device in every box
What a wired smart home really costs, priced line by line.
Read →
For electricians and integrators
Grow your smart home business
- Ready cabinet layouts, wiring diagrams and project templates
- Home Assistant and ESPHome integration with local control
- DIN-rail hardware made for the distribution board
- Open architecture, no vendor lock-in
- Direct technical support from the engineers who build the platform