Your Swiss Army Knife for Network Automation
The tinycontrol LK3.9 is not just a LAN Controller – it is the central control unit for your most demanding automation and monitoring tasks. Whether you want to monitor temperatures and voltages in the server room, intelligently control your heating, or automate industrial processes: With its huge selection of interfaces, you are equipped for every challenge. From a powerful Relay for 230V consumers, precise PWM outputs, to six analog inputs for various sensors – the LK3.9 is the universal solution for your projects.
Intelligent Control: Events, Schedules, and PID Controllers
The true strength of the LK3.9 lies in its software. Via the intuitive web interface, you can easily define complex automation sequences. The 'Events Config' system allows you to link conditions from two different sensors with logical operators (AND, OR, XOR etc.) and trigger actions based on them. Switch outputs, send emails, SNMP traps, or MQTT messages. With the integrated Scheduler, you can execute actions based on time, while the IP-Watchdog function monitors up to six Network devices and automatically restarts them in case of failure. For demanding control tasks, PID controllers are even available, for example, to precisely maintain a target temperature. The official Home Assistant Integration completes the package.
Professional Connectivity: LAN, PoE, and Open Protocols
A stable connection is essential. The tinycontrol LK3.9 therefore relies on a reliable 10/100 Mbps Ethernet connection for robust integration into your Network. Particularly practical: Thanks to the support for active IEEE 802.3af PoE and passive PoE, you can power and supply data to the device with just a single network cable. This saves installation effort and separate power supplies that you would otherwise have to implement via PoE Injectors / Power Supplies. By implementing standard protocols such as HTTP, SNMP, and especially MQTT, the controller is maximally compatible and can be easily integrated into higher-level IoT platforms and Smart Home systems.
Limitless Sensor and Actuator Technology
Capture the world around you. The LK3.9 is a true data collection point. Via the 1-Wire Bus, you can easily connect digital DS18B20 temperature sensors. The I2C interface opens the door to a huge world of sensors for humidity, pressure, CO2, or fine dust. Four digital inputs count pulses from energy meters or read the status of door contacts. Six flexible analog inputs measure voltages, currents (with additional modules), or the values of photoresistors. With an optional adapter, you can even extend the controller with a Modbus-RTU interface to control professional industrial sensors and actuators.
Strengths & Notes at a Glance
- Pro: Exceptionally high interface variety for maximum flexibility in IT, industry, and home automation.
- Pro: Highly developed, autonomous automation logic through Event System, Scheduler, and PID controllers.
- Pro: Professional Network connectivity with Ethernet and support for active (802.3af) as well as passive PoE.
- Pro: Future-proof through open standard protocols like HTTP, SNMP, and MQTT for easy integration.
- Note: A separate expansion board or adapter is required for using Modbus RTU.
- Note: The enormous range of functions may require a certain familiarization period for beginners without prior knowledge.
Specifications & Features
| Manufacturer: | tinycontrol |
| Model: | LK3.9 |
| EAN: | 5907333395009 |
| HAN / MPN: | 95009 |
| Product Classification: | IoT Controller (Internet of Things Controller) |
| Processor (CPU): | ARM 32F407 |
| API Compatibility: | Identical to previous versions (e.g., v3.5) |
| Firmware: | Dedicated firmware version required, regular updates from manufacturer |
| Ethernet Interface: | 1x RJ45 Port, 10/100 Mbps |
| Power over Ethernet (PoE): | Active according to IEEE 802.3af (Mode A) and Passive (Mode B, via Jumper) |
| Network Protocols: | HTTP (Webserver), SNMP, MQTT, HTTP Commands |
| IP Configuration: | DHCP Client (Standard), Fallback to static IP 192.168.1.100 |
| Relay Outputs: | 1x Changeover (NO, C, NC) with screw terminals |
| Switching Capacity Relay: | Max. 255 V AC, 10 A |
| Transistor Outputs: | 4x Open-Collector (OC), 1x VCC switching (max. 1 A) |
| PWM Outputs: | 4x Pulse Width Modulation |
| PWM Voltage Level: | 3.3 V |
| PWM Frequency Range: | 1 Hz - 1 MHz |
| Number of Analog Inputs: | 6 |
| Measurement Range INPA1, INPA2: | Switchable 0.0 - 5 V / 0 - 55 V |
| Measurement Range INPA3, INPA4: | Switchable 0.0 - 3.3 V / 0 - 33 V |
| Measurement Range INPA5, INPA6: | Fixed Range 0.0 - 3.3 V |
| Number of Digital Inputs: | 4 (INPD1-INPD4) |
| Voltage Level Digital Inputs: | Low: 0 - 1.2 V, High: 1.5 - 20 V |
| Function Digital Inputs: | Status query, Pulse counting |
| 1-Wire Interface: | 1x RJ12 (for e.g., DS18B20 sensors) |
| I2C Interface: | 1x RJ12 (shared with 1-Wire) |
| Modbus RTU Interface: | Supported via RS485 (requires tHAT expansion board) |
| Serial Interface: | UART |
| Supply Voltage: | 8 - 55 V DC (via screw terminal or PoE) |
| Power Consumption: | approx. 0.5 W (without active Relays) |
| Management: | Integrated Web Interface |
| Automation Functions: | Event System, Scheduler, IP Watchdog, PID/Power/Voltage Controllers |
| Smart Home Integration: | Official Home Assistant Integration |
| Mounting: | 35 mm DIN Rail |
| Operating Temperature: | -20 °C to +85 °C |
| Dimensions: | 66 x 79 x 40 mm (without bracket) |
| Weight: | 90 g |
Scope of Delivery
| 1 x tinycontrol LK3.9 LAN Controller |
Frequently Asked Questions (FAQ)
Can the tinycontrol LK3.9 be connected directly to the mains (230V)?
No, the device itself is powered by low voltage (8-55V DC) or via Power over Ethernet (PoE Injectors / Power Supplies). However, the built-in relay can switch loads up to 255V AC to control 230V devices.
What is the main difference between the LK3.9 and the older LK3.5?
The main difference is the significantly faster ARM 32F407 processor in the LK3.9, which offers higher performance. Although the API is identical for easy migration, the LK3.9 requires its own, newer firmware line.
Which temperature sensors can I connect directly to the LK3.9?
You can connect digital DS18B20 temperature sensors via the 1-Wire bus. Additionally, analog temperature sensors like NTC thermistors or PT1000 probes can be operated on the analog inputs.
Is an internet connection required for the operation of the LAN controller?
No, an internet connection is not necessary for pure operation and control within the local Network. An internet connection is only required for remote access or the use of cloud services such as MQTT or email notifications.
Does the LK3.9 support WiFi?
No, the tinycontrol LK3.9 does not have an integrated WiFi interface. Network connectivity is exclusively via the wired Ethernet port, which can be connected to WiFi Routers or WiFi Access Points for broader coverage.
How do I find the device's IP address after the first connection?
By default, the device attempts to obtain an IP address via DHCP from your router. If no DHCP server is found, the device will use the static IP address 192.168.1.100 after 45 seconds.
Street name: ul. Mazowieckiego 7g
Postal code, City: 26-600 , Radom
Country: Polen
E-Mail: info@tinycontrol.pl
Homepage: https://www.tinycontrol.pl