LAN controller with relay V3.9 (LK3.9)

LK3.9 is a continuation of the v3.5 series. It has the same API. It is recommended for typical monitoring and automation applications in IT environments. This version is equipped with a faster ARM 32F407 processor. It has the same functions, but a different firmware series from version v3.5

The device contains a built-in web server (like all LK versions) for displaying measurements and configuring settings through a web browser.

Key Features:

• 2 analog inputs with switchable range (measurement from 1 mV to 33 V): suitable for measuring voltage, DC current, AC current (with additional sensors), pressure sensors, thermocouples, distance sensors, photoresistors for light measurement and many others.
• 2 analog inputs with switchable range (measurement from 1 mV to 55 V): for measuring voltage, DC current, AC current (with additional sensors), pressure sensors, thermocouples, distance sensors, photoresistors for light measurement and others.
• 2 analog inputs for measurement up to 3.3 V: for measuring voltage and current (DC and AC via additional sensors) and 4-20mA converters.
• I2C bus for connecting sensors via RJ12 connector: supports a wide range of I2C sensors (list below) and DS18B20 via 1-Wire bus.
• Serial bus (UART).
• Bus for RS485 converter - MODBUS RTU (requires additional board): enables reading of preconfigured devices and setting configurations for reading any device using Modbus protocol.
• 4 logic inputs: as status sensors for door monitoring, infrared motion sensors, manual switching buttons with bistable mode option, pulse counters for electric meters and timers for input reset.
• 1 relay (NO, C, NC).
• 1 transistor output: power supply voltage output, for controlling loads with current consumption up to 0.5A.
• 4 outputs for switching relays/transistors in OC standard.
• 4 PWM outputs from 50 Hz to 100 kHz.
• Power supply voltage and on-board temperature measurement.
• Ethernet communication (10/100Mb) with 802.3af PoE support.
• Management via web interface.

Key Interface Capabilities via Web Interface:

• Display of sensor data in administrator or user panel with customizable layout.
• Event configuration.
• Action scheduling configuration.
• OLED display settings.
• MQTT client, HTTP client and SNMP protocol configuration.
• Email notification settings.
• Access management, firmware updates.
• Local or network time configuration (NTP).

Technical Specifications:

• Power supply voltage: 8÷55 V
• Power consumption: 0.5 W
• PoE support: Yes (802.3af) Mode A, passive Mode B with jumper
• Interface: Ethernet 10/100 Mbit/s
• Operating temperature range: -20 to +85 °C (non-condensing)
• Dimensions: 66x79x40 mm (without DIN mounting)
• Weight: 90 g
• DIN rail mounting: Yes (35 mm)

Documentation: LAN Controller Documentation

• MQTT Server: mqtt.ats.pl (proprietary solution extending LK device functionality; free for non-commercial users with single email login).

MQTT Server Functions:

• Data collection from LK sensors and visualization through graphs and listings.
• Data filtering and MQTT messages: Format/Filter/Topic (e.g., controlling one device based on measurements from another).
• Task scheduling for managing high-frequency events.
• Remote control of LAN Controller via mobile application or website, regardless of network location.

Main Application Areas:

• IoT controller with automation functions
• Controller for energy management
• Environmental monitoring using IoT
• Home automation with LK3.9 controller
• Energy management in smart homes
• IoT controller for temperature and humidity measurement
• Solar installation and heat pump control
• Power supply voltage monitoring and source switching
• Remote electricity consumption control
• LAN controller with MQTT protocol support
• AC and DC current measurement in IoT systems
• Environmental sensor integration with IoT controller
• Device control via Ethernet and PoE
• IoT controller with analog and digital inputs
• Industrial automation management with LK3.9

Detailed Applications:

IT:

• Temperature and humidity monitoring in server cabinets, ventilation and heating control.
• Door access monitoring.
• Battery voltage, power supply and mains power outage monitoring.
• ISP watchdog for Ethernet connection monitoring and device resets.
• Sending input states and environmental parameters overlaid on images from IP cameras (e.g., Dahua).

INSTALLATIONS:

• Temperature monitoring and basic automation for central heating systems.
• Temperature and pressure monitoring for solar systems with basic automation.
• Heat pump operation monitoring with data presentation on internet graphs.
• Power supply voltage monitoring and automatic switching to backup sources.
• Remote energy consumption monitoring via Modbus meters or pulse inputs.
• Remote device switching from simple operator panel.
• Network (wired or wireless) command transmission between multiple LK devices.

SMART HOME:

• Automated control based on time and specific settings, e.g., turning on heating when temperature drops below set level.
• Remote output control via mobile devices.
• Automated lighting or device control based on schedule or remote commands.
• Combined control from wall switches and devices.
• Twilight switch function.

RENEWABLE ENERGY:

• Solar panel power monitoring.
• Wind turbine power monitoring.
• Basic battery charging control.
• DC energy consumption measurement.
• AC energy consumption and inverter production measurement.

AGRICULTURE:

• Temperature and humidity monitoring and control in greenhouses.
• Cyclic control of feeders and other equipment in animal husbandry.
• Irrigation systems.

Supported Sensors and Devices:

Analog Inputs:

• AC voltage sensor: AC-meter.
• AC current sensors: SCT013-000, SCT-013-03.
• DC current sensors: ACS711EX_15, ACS711EX_30, ACS709_75, ACS711LC_12, ACS711LC_25, ACS711LC20, WCS1800.
• High DC voltage sensor (for PV, in development).
• Temperature sensor: PT1000 (with additional resistor).
• Flood sensor (water).

Logic Inputs:

• Magnetic door sensors.
• Electric meters with pulse outputs.
• Rain sensors with pulse outputs.

1-Wire Bus:

• Temperature sensor: DS18B20.

I2C Bus:

• Humidity sensors: BME280, AM2320, HTS221, AM2301B, AHT20, AHT25.
• Particle sensors: SPS30, APM10 (PM1, PM2.5, PM4, PM10).
• CO2 sensors: SCD40, ACD10.
• OLED display: 0.96 inch.

Serial Port:

• GSM module.
• Particle sensors SPS30 and SDS011.
• CO2 sensors: MH-Z16, MH-Z19.
• PV inverters: Duraluxe.
• Ultrasonic distance sensors.
• 2D and barcode scanners.
• RFID readers.

Modbus Port (via RS485 converter):

• Bidirectional electric meters: SDM120M, SDM630M, SDM72D-M, Chint DTSU666.
• Professional water parameter sensor: RDO-PRO-X.
• Solar chargers: Epever Tracer.
• PV inverters: Sofarsolar and GTIL.
• Danfoss cooling controller: EKC 202C.

Modbus TCP:

• Modbus master can read sensors connected to LK (tested with Siemens LOGO).

HTTP Client:

• Smart WiFi sockets with Tasmota firmware.
• Display of sensor measurements on images from IP cameras.