DIN-rail expansion module with 3 × 16A relay outputs (NO/NC), 4 isolated 24V digital inputs, RS-485 Modbus RTU slave, and 3 user buttons + LEDs on the front panel. Configurable via WebConfig over USB-C. Each input can be wired to a wall switch, motion sensor or door contact and used as a Home Assistant binary_sensor. Ideal for controlling pumps, gas boilers, valves, and high-current loads through a HomeMaster MicroPLC or MiniPLC.

Smart stair lighting controller for up to 32 steps with Modbus integration. Drives RGB or single-color LEDs with progressive on/off lighting per step, ambient light sensor, and dual motion-sensor input (top and bottom of stairs). RS-485 Modbus RTU slave, ESPHome firmware, configurable via WebConfig over USB-C. Designed for residential staircase lighting that activates only when someone is walking up or down.

Modbus RGBCCT LED controller for 12-24V LED strips. Five MOSFET PWM channels (RGB + warm/cool white) with smooth dimming, 4 digital inputs for wall buttons, RS-485 Modbus RTU slave, and ESPHome firmware. Configure via WebConfig over USB-C, integrate with Home Assistant in seconds. Suitable for ambient lighting, RGBCCT strips in living rooms, kitchen under-cabinet, and decorative installations.

17-zone Modbus alarm module on DIN-rail. Connects up to 17 dry-contact sensors (door, window, PIR motion, glass-break, water leak) with individual zone status reporting via RS-485 Modbus RTU. Integrated buzzer output, programmable zone debouncing, and 24V isolated inputs. Pairs with HomeMaster MicroPLC or MiniPLC and Home Assistant for whole-house intrusion detection, occupancy monitoring, and automation triggers.

3-phase energy metering DIN-rail module with two CT clamp inputs and one pulse-counting input. Measures voltage, current, active and reactive power, energy consumption per phase, power factor, and frequency. RS-485 Modbus RTU slave, ESPHome firmware, configurable via WebConfig over USB-C. Ideal for whole-house energy monitoring, solar PV generation tracking, EV charging measurement, and integration with Home Assistant Energy Dashboard.

Analog I/O expansion module with 4 isolated analog inputs (0-10V or 4-20mA configurable), 2 analog outputs (0-10V), and RTD support for PT100/PT1000 temperature probes. RS-485 Modbus RTU slave, RJ45 sensor connectors, ESPHome firmware, configurable via WebConfig over USB-C. Ideal for industrial-grade sensor integration, HVAC monitoring, water tank level, soil moisture, and process control with Home Assistant.

Water leak detection and flow metering module with 5 dry-contact leak sensor inputs (kitchen, bathroom, washing machine, boiler room, basement), 2 pulse flow meter inputs with built-in heat-meter calculator (pulses per litre, supply and return DS18B20 temperatures, kWh accumulator), and 1-Wire bus for additional sensors. RS-485 Modbus RTU slave, ESPHome firmware, configurable via WebConfig. Pairs with valves and HomeMaster MicroPLC for full smart-home water protection and heat monitoring.

Modbus AC dimmer module for incandescent, halogen, and dimmable LED bulbs. Two independent MOSFET channels with leading-edge phase-cut dimming, 4 digital inputs for physical wall buttons (long-press toggle, short-press dim), zero-crossing detection for flicker-free output. RS-485 Modbus RTU slave, ESPHome firmware. Configurable via WebConfig over USB-C. Pairs with HomeMaster MicroPLC and Home Assistant for smooth, smart lighting control of legacy AC fixtures.