SONOFF MINI-DIM Smart Dimmer Matter over Wi-Fi Module with Energy Monitor

Troubleshooting in a compact module

Many homeowners want to make their existing dimmable lighting smart without infringing on physical switches or the aesthetics of the home. The Sonoff MINI-DIM solves this by disappearing invisibly behind an existing wall switch as an ultra-compact flush-mounted module (only 45 x 39.4 x 16.8 mm). Thanks to Matter over WiFi, it works directly with Apple Home, Google Home, Amazon Alexa, Samsung SmartThings and Home Assistant without a separate hub or bridge. The module combines trailing-edge dimming technology with real-time power measurement and built-in overheating protection, allowing you to safely and precisely dim what you want, from subtle mood lighting to full brightness.

Power and Connectivity

The MINI-DIM operates on 220–240 V~ 50 Hz (single phase grid) and requires a neutral wire in the flush-mounted box. The module draws a maximum of 2 A (400 W resistive / 200 VA LED) and is powered via screw terminals (L, N, Lout). It communicates wirelessly via Wi-Fi 2.4 GHz (IEEE 802.11 b/g/n) with Matter-over-WiFi certification. This means no Thread Border Router is needed - the module connects directly to your existing Wi-Fi network and Matter fabric. The MCU is an ESP32-C3, which ensures fast response, OTA updates, and local LAN control (even without internet). External switches are connected to S1 and S2 (potential-free contacts) and support both toggle switches and momentary buttons in 1-way, 2-way, and 3-way configurations.

Functionality and Settings

The dimmer uses trailing-edge dimming technology, which is the standard for modern dimmable LED lighting and electronic transformers. Supported loads:

• Dimmable LED: up to 200 VA
• Incandescent / halogen lamps: up to 400 W
• Dimmable electronic transformers: up to 200 W

Calibration is possible both automatically (via app or by pressing the button for 10 s) and manually. During calibration, the module measures the actual dimming range of the connected lamp and precisely sets the minimum/maximum brightness limits, which guarantees flicker-free dimming from 0–100 %. The module measures real-time voltage (V), current (A), power (W) and reports this via Matter to your smart home platform.

External switch behavior is configurable per type:

• Single toggle switch (1-way): short press = on/off
• Single momentary button (1-way): short press = on/off, hold = dim (alternating)
• Double momentary button (2-way): S1 short = on / long = brighter; S2 short = off / long = dimmer
• Triple momentary button (3-way): S1 = step/follow brighter, middle = on/off, S2 = step/follow dimmer

The power-on state (behavior after power failure) is adjustable: off, on, toggle, or previous state. Overheating protection via built-in NTC temperature sensor automatically switches off the output in case of overtemperature and issues a warning in the app.

Expansion and Accessories

For a complete installation, the SONOFF EDIM enclosure is available - a compact flush-mounted enclosure specifically designed for the MINI-DIM and MINI-ZBDIM, for a neat finish in the flush-mounted box. In addition, you can expand the module with wireless Zigbee buttons (e.g., Sonoff SNZB-01P or SNZB-04P) via Home Assistant automations for additional control points without extra wiring. For Zigbee networks, we recommend a Zigbee USB controller.

Safety and Reliability

• PC V0 housing (flame retardant, UL94 V-0)
• CE / RoHS certified
• Overheating protection with automatic shutdown and UI warning
• Load detection prevents damage with unsuitable lamps
• IP20 (for indoor use only, dry environment)
• Installation by qualified electrician mandatory (230V mains voltage)

Home Assistant Integration (Matter over WiFi)

The MINI-DIM integrates locally and fully via Matter in Home Assistant - no cloud, no eWeLink account required for local use.

Pairing Procedure Step-by-Step

1. Ensure Home Assistant OS is up-to-date and the Matter integration is installed (Settings → Devices & Services → Add integration → "Matter").
2. Install the Home Assistant Companion App on your smartphone.
3. Put the MINI-DIM into pairing mode: press and hold the button on the module for 5–10 seconds until the LED flashes rapidly.
4. Open the Companion App → Settings → Devices & Services → Add integration → "Matter" → "Add Matter device" → choose "No, it's new".
5. Scan the Matter QR code on the module/packaging or manually enter the setup code.
6. Choose "Add to Home Assistant" and assign it to an area.

Entities after Pairing (Matter)

• light (state, brightness 0–100 %, transition supported)
• sensor.power (W), sensor.voltage (V), sensor.current (A)
• sensor.energy (kWh, cumulative)
• select.power_on_behavior (off / on / toggle / previous)
• number.min_brightness, number.max_brightness (calibration limits)
• button.calibration_start / button.calibration_stop
• switch.overheat_protection (status)

Local control confirmed: Yes - Matter over WiFi works completely locally (LAN). Cloud access is optional for remote access via Nabu Casa or VPN. OTA firmware updates are pushed via Matter.

Homey Integration

The MINI-DIM works on Homey Pro (early 2023 or later) via the Matter app (official Athom app). Homey Bridge is not supported for Matter-over-WiFi devices (only Thread/Matter-over-Thread). Pairing is analogous to HA: Homey App → Devices → + → Matter → scan QR code. Limitation compared to HA: no direct access to advanced entities such as calibration buttons or min/max brightness via Homey UI - these must be set via the eWeLink app or HA and then exposed to Homey via Matter.

Other Platforms

Automation Examples (Home Assistant)

1. Everyday: "Gentle Wake-up" Schedule (timer + fade-in)

Goal: The bedroom light gradually dims up over 15 minutes every weekday at 06:30.

alias: "Gentle wake-up bedroom"
trigger:
  - platform: time
    at: "06:30:00"
condition:
  - condition: time
    weekday: [mon, tue, wed, thu, fri]
action:
  - service: light.turn_on
    target:
      entity_id: light.slaapkamer_mini_dim
    data:
      brightness_pct: 1
      transition: 900
  - delay: "00:15:00"
  - service: light.turn_on
    target:
      entity_id: light.slaapkamer_mini_dim
    data:
      brightness_pct: 80

2. Advanced: "Motion-activated night light with energy limit" (sensor + condition + notification)

Goal: At night, when motion is detected, the kitchen light turns on softly (10%), but only if the daily consumption is < 5 kWh. If exceeded: notification.

alias: "Kitchen night light with energy monitoring"
trigger:
  - platform: state
    entity_id: binary_sensor.keuken_beweging
    to: "on"
condition:
  - condition: time
    after: "22:00:00"
    before: "06:00:00"
  - condition: template
    value_template: "{{ states('sensor.keuken_dagverbruik') | float(0) < 5 }}"
action:
  - service: light.turn_on
    target:
      entity_id: light.keuken_mini_dim
    data:
      brightness_pct: 10
      transition: 2
  - delay: "00:02:00"
  - service: light.turn_off
    target:
      entity_id: light.keuken_mini_dim
    data:
      transition: 5
  - condition: template
    value_template: "{{ states('sensor.keuken_dagverbruik') | float(0) >= 4.5 }}"
  - service: notify.mobile_app_telefoon
    data:
      title: "Energy Warning"
      message: "Kitchen daily consumption approaching 5 kWh (current: {{ states('sensor.keuken_dagverbruik') }} kWh)."

Points of Attention and Limitations

• Neutral wire mandatory in the flush-mounted box - no "no-neutral" version available.
• 230V AC only - not suitable for 12V/24V low-voltage systems.
• Maximum 2 A / 400 W - not for fans, motors, or inductive loads without transformer.
• No Zigbee/Thread - purely Wi-Fi + Matter. Want Zigbee? Choose the MINI-ZBDIM (sold separately).
• No dry-contact relay - the output is phase-cut dimmed, not switching (for switching: MINI-R4 or MINI-D).
• eWeLink app required for initial calibration and switch type configuration if you don't have a Matter controller with those options.
• Homey Bridge does not support Matter-over-WiFi - only Homey Pro.
• Philips Hue Bridge compatibility: no (Hue's Matter bridge function is limited to lights).

Box Contents

• 1x Sonoff MINI-DIM module (MINI Extreme series)
• 1x Quick installation guide (multilingual, NL included)
• 1x Matter QR code card (for pairing)
• Mounting materials: no screws/plugs included (standard flush-mounted box installation)

Compatibility Rule

The Sonoff MINI-DIM (EAN 6979033600003) is compatible with:

• Home Assistant (via Matter integration, local)
• Homey Pro (via Matter app)
• Apple Home / HomeKit (via Matter)
• Google Home (via Matter)
• Amazon Alexa (via Matter)
• Samsung SmartThings (via Matter)
• eWeLink App (cloud / local LAN)
• All Matter-certified controllers that support Wi-Fi Matter devices

Not compatible with: Zigbee hubs (Sonoff ZBBridge, Hue Bridge, Homey Bridge), Thread-only controllers, Z-Wave controllers.

Frequently Asked Questions

How do I pair the Sonoff MINI-DIM with Home Assistant?

Install the Matter integration in Home Assistant, open the Companion App, put the module into pairing mode (press and hold the button for 5–10 s), scan the QR code and add to Home Assistant. See the detailed steps in the Home Assistant section.

Is a hub or bridge required?

No. The MINI-DIM uses Matter over WiFi and connects directly to your Wi-Fi network. No Zigbee hub, Thread Border Router, or Sonoff bridge needed. Required: a Matter controller (Home Assistant, Homey Pro, Apple Home, Google Home, Alexa, SmartThings).

Are batteries included?

No. The module is powered by 230V mains voltage (L + N). There are no batteries in the module and none are needed.

Can I expand the MINI-DIM with extra switches?

Yes. The module supports two external switch inputs (S1, S2) for toggle switches or momentary buttons in 1-way, 2-way, or 3-way configuration. In addition, you can pair wireless Zigbee buttons (e.g., Sonoff SNZB-01P) via Home Assistant automations as additional control points.

Is the MINI-DIM compatible with my dimmable LED lamps?

The MINI-DIM uses trailing-edge dimming technology and supports dimmable LEDs up to 200 VA. Through automatic/manual calibration, the module adjusts the dimming range to your specific lamps, guaranteeing flicker-free dimming. Always check if your LED lamps are marked as "dimmable."

What are the limitations compared to the Zigbee version (MINI-ZBDIM)?

The MINI-DIM (Matter/WiFi) has no Zigbee mesh function (router/repeater), does not work on Homey Bridge, and requires Wi-Fi range. The MINI-ZBDIM (Zigbee) acts as a Zigbee router, works on Homey Pro and Bridge, and is more robust in large Zigbee networks. Choose MINI-DIM for Matter/WiFi simplicity, MINI-ZBDIM for Zigbee mesh power.

Can I use the module without a neutral wire?

No. The MINI-DIM requires a neutral wire in the flush-mounted box for the module's power supply itself. For installations without a neutral wire, no Sonoff dimmer module is available; consider a smart dimmable lamp (e.g., Philips Hue or Zigbee LED spotlight) or a no-neutral switch (for switching only, not dimming).

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