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DimmerLink ESPHome Component

ESPHome external component for external_components: github://robotdyn-dimmer/DimmerLink@main — AC TRIAC dimmer controller with I2C interface.



Features

  • Smooth brightness control (0-100%)
  • Multiple dimming curves: LINEAR, RMS, LOG
  • Real-time status monitoring
  • AC frequency detection (50/60 Hz)
  • Device reset and recalibration commands
  • Full Home Assistant integration



Requirements

  • ESPHome 2024.1.0 or newer
  • ESP32 or ESP8266 board
  • DimmerLink controller connected via I2C



Installation

Add to your ESPHome configuration:

yaml
external_components:
  - source: github://robotdyn-dimmer/DimmerLink@main
    components: [dimmerlink]

For local development:

yaml
external_components:
  - source: components
    components: [dimmerlink]



Wiring

DimmerLink ESP32 ESP8266
SDA GPIO21 GPIO4
SCL GPIO22 GPIO5
GND GND GND
VCC 3.3V 3.3V



Quick Start

yaml
i2c:
  sda: GPIO21
  scl: GPIO22

dimmerlink:
  id: dimmer1
  address: 0x50

light:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    name: "Living Room Light"



Configuration Reference


Hub Configuration

The dimmerlink hub establishes I2C communication with the device.

yaml
dimmerlink:
  id: dimmer1
  address: 0x50  # Optional, default: 0x50
Option Type Default Description
id ID Required Hub identifier
address hex 0x50 I2C address (0x08-0x77)


Light Platform

Controls dimmer brightness.

yaml
light:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    name: "Dimmer"
    default_transition_length: 1s
    gamma_correct: 1.0
Option Type Default Description
dimmerlink_id ID Required Reference to hub
name string Required Entity name
default_transition_length time 1s Fade duration
gamma_correct float 1.0 Gamma correction (1.0 = disabled)


Sensor Platform

Monitors device parameters.

yaml
sensor:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    update_interval: 60s
    ac_frequency:
      name: "AC Frequency"
    level:
      name: "Brightness Level"
    firmware_version:
      name: "Firmware"
    ac_period:
      name: "AC Period"
Sensor Unit Description
ac_frequency Hz AC mains frequency (50 or 60)
level % Current brightness (0-100)
firmware_version - Device firmware version
ac_period μs AC half-period in microseconds


Binary Sensor Platform

Device status indicators.

yaml
binary_sensor:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    update_interval: 5s
    ready:
      name: "Ready"
    error:
      name: "Error"
    calibration_done:
      name: "Calibration Done"
Sensor Description
ready Device is ready for commands
error Error condition detected
calibration_done Zero-crossing calibration complete


Select Platform

Dimming curve selection.

yaml
select:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    curve:
      name: "Dimming Curve"

Available curves:

Curve Description
LINEAR Linear brightness control
RMS RMS-based power control (constant power)
LOG Logarithmic curve (perceived brightness)


Button Platform

Device control commands.

yaml
button:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    reset:
      name: "Reset"
    recalibrate:
      name: "Recalibrate"
Button Description
reset Restart the DimmerLink device (~3 sec)
recalibrate Recalibrate AC zero-crossing (~200 ms)



Complete Example

yaml
esphome:
  name: dimmerlink-demo
  friendly_name: DimmerLink Demo

esp32:
  board: esp32dev

logger:
api:
  encryption:
    key: !secret api_key
ota:
  - platform: esphome
    password: !secret ota_password

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:
    ssid: "DimmerLink-Fallback"

captive_portal:
web_server:

external_components:
  - source: github://robotdyn-dimmer/DimmerLink@main
    components: [dimmerlink]

i2c:
  sda: GPIO21
  scl: GPIO22
  scan: true
  frequency: 100kHz

dimmerlink:
  id: dimmer1
  address: 0x50

light:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    name: "Light"
    default_transition_length: 500ms

sensor:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    ac_frequency:
      name: "AC Frequency"
    level:
      name: "Brightness"
    firmware_version:
      name: "Firmware"

binary_sensor:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    ready:
      name: "Ready"
    error:
      name: "Error"

select:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    curve:
      name: "Curve"

button:
  - platform: dimmerlink
    dimmerlink_id: dimmer1
    reset:
      name: "Reset"
    recalibrate:
      name: "Recalibrate"



Multiple Devices

Connect multiple dimmers on the same I2C bus:

yaml
dimmerlink:
  - id: dimmer_living
    address: 0x50
  - id: dimmer_bedroom
    address: 0x51
  - id: dimmer_kitchen
    address: 0x52

light:
  - platform: dimmerlink
    dimmerlink_id: dimmer_living
    name: "Living Room"
  - platform: dimmerlink
    dimmerlink_id: dimmer_bedroom
    name: "Bedroom"
  - platform: dimmerlink
    dimmerlink_id: dimmer_kitchen
    name: "Kitchen"



Troubleshooting


Device Not Found

  1. Check I2C wiring (SDA, SCL, GND, VCC)
  2. Enable I2C scan:
    yaml i2c: scan: true
  3. Verify device address in ESPHome logs


AC Frequency Shows "Unknown"

  • Wait for calibration to complete (~2 seconds after power-up)
  • Check calibration_done binary sensor
  • Press "Recalibrate" button


Light Not Responding

  1. Check ready status (should be "Connected")
  2. Check error status (should be "OK")
  3. Verify I2C frequency is 100kHz or lower:
    yaml i2c: frequency: 100kHz


Error Codes

Code Name Description
0x00 OK No error
0xF9 SYNTAX Command syntax error
0xFC NOT_READY Device not calibrated or FLASH error
0xFD INDEX Invalid channel index
0xFE PARAM Invalid parameter value



Technical Specifications

  • I2C Address: 0x50 (default), configurable 0x08-0x77
  • I2C Speed: 100 kHz (Standard Mode)
  • Brightness Range: 0-100%
  • Startup Delay: 2 seconds (for calibration)
  • Supported AC: 50Hz / 60Hz (auto-detect)



License

MIT License - see LICENSE



Links

Features Requirements Installation Wiring Quick Start Configuration Reference Complete Example Multiple Devices Troubleshooting Technical Specifications License Links