Tinycontrol
LK4mini

LK4mini - universal IoT controller

Two variants, many possibilities
LK4mini is a compact and versatile controller designed for remote reading of digital sensor data and saving it to a server. It’s ideal for applications in automation, environmental monitoring, and industrial systems.

The device is available in two interface variants for connecting sensors and external modules: I2C + I2C/1-Wire oraz Modbus + I2C/1-Wire.

Reliable connectivity
Both variants offer communication via Ethernet and Wi-Fi, allowing flexible integration in various installation environments.

Simple management

LK4mini can be fully configured through an intuitive web interface, accessible via the built-in HTTP server.

Additionally, the device supports remote control using HTTP commands or - after initial setup - via MQTT protocol.

Interfaces

LK4mini supports many interfaces, allowing you to connect many different modules and sensors - depending on the device version

I2C: Support for AM2301B/AHT25/AHT20 temperature and humidity sensor.

1-Wire: DS18B20 temperature sensors.

I2C: Temperature, humidity, pressure, particulate matter and CO2 sensors.

1-Wire: DS18B20 temperature sensors.

I2C: Temperature, humidity, pressure, particulate matter and CO2 sensors.

Mounting options

Desktop

DIN rail

Cover (wall mounting)

Events

LK4mini features an advanced event handling system that allows automatic actions to be triggered based on defined conditions.

It is possible to check two data sources simultaneously (e.g., sensors) and combine these conditions using a logic operator: AND, OR, NAND, NOR, or XOR.

In response to an event, you can:
  • send an email message,
  • send an SNMP trap, MQTT command, or HTTP request,
  • use virtual outputs to create more complex logic sequences.
Find out more

Scheduler

The scheduler allows automatic execution of actions at a defined time — in hourly, daily, weekly or monthly cycles.

Available actions include:
  • controlling virtual outputs (VAR),
  • turning on the OLED display and changing the active scene.

In combination with the Events function, you can use the actions available therein indirectly, and add time dependencies to events using VAR variables.

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Modbus

LK4mini in the Modbus variant enables reading data from various devices and sensors via the Modbus RTU (RS485) bus.

It offers ready-to-use profiles for popular energy meters and PV inverters, and also allows easy integration of other devices using the custom Modbus device configuration feature.

The acquired data can be used for automation, displayed in the web interface, or forwarded to an external server.

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mqtt.ats.pl service

It is our proprietary solution that complements the functionality of LK4mini, based on the MQTT protocol.

Access is free for self-use - all features are available with some limitations, but can be customized to your specific needs upon contact.

The service currently offers the following features:

  • Collecting data from the Lan Controller and presenting them on a chart or table, with the option of exporting data.
  • Defining reactions to incoming data with conditions regarding value, time. With their help, you can control one device depending on the readings from another device.
  • Defining tasks to be performed on selected days of the week at specific times (can be associated with reactions).
  • Viewing data from the supported devices and controlling it remotely using a website or a mobile application.