LK3.9 IoT controller

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

The device features a built-in web server (similar to all LK versions) for viewing readings and configuring settings via a web browser.

Key Features:

• 2 analog inputs with switchable gain (measuring 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 more.
• 2 analog inputs with switchable gain (measuring 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 measurements up to 3.3 V: for voltage and current measurements (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 the 1-Wire bus.
• Serial bus (UART).
• Bus for RS485 converter - MODBUS RTU (additional board required): allows reading pre-configured devices and setting up configurations to read any device using the Modbus protocol.
• 4 logic inputs: as status sensors for door monitoring, infrared motion sensors, buttons for manual switching with a bistable mode option, pulse counters for energy meters, and timers for input resets.
• 1 relay (NO, C, NC).
• 1 transistor output: power supply voltage output, for controlling loads with up to 0.5A current consumption.
• 4 outputs for relay/transistor switching in OC standard.
• 4 PWM outputs from 50 Hz to 100 kHz.
• Measurement of supply voltage and on-board temperature.
• Ethernet communication (10/100Mb) with 802.3af PoE support.
• Management via a web interface.

Key interface capabilities via the web interface:

• Viewing sensor data in an administrator or user panel with customizable layout.
• Event configuration.
• Actions scheduling configuration.
• OLED display setup.
• MQTT client, HTTP client, and SNMP protocol configuration.
• Email notification setup.
• Access management, firmware upgrades.
• Local or network time (NTP) configuration.

Technical Specifications:

• Power supply voltage: 8÷55 V.
• Power consumption: 0.5 W.
• Power output for Modbus devices: 12V, 200mA.
• PoE support: Yes (802.3af) Mode A, passive Mode B with jumper.
• Interfaces: Ethernet 10/100 Mbit/s, Wi-Fi 802.11n, RS485 Modbus RTU.
• Operating temperature range: -20 to +85 °C (non-condensing).
• Dimensions: 66x79x40 mm (without DIN mount).
• Weight: 90 g.
• DIN rail mounting: Yes (35 mm).

Documentation: LANControllerDocumentation

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

MQTT Server Features:

1. Data collection from LK sensors and visualization via charts and listings.
2. Data filtering and MQTT messaging: Format/Filter/Topic (e.g., controlling one device based on readings from another).
3. Task scheduling for managing high-frequency events.
4. Remote control of the LAN Controller via a mobile app or web page, regardless of network location.

Applications:

IT:

• Monitoring temperature and humidity in server cabinets, controlling ventilation and heating.
• Monitoring door access.
• Monitoring battery voltage, power supplies, and grid power outages.
• ISP watchdog for Ethernet connection monitoring and device resets.
• Sending input states and environmental parameters overlaid on IP camera images (e.g., Dahua).

INSTALLATIONS:

• Temperature monitoring and basic automation for central heating systems.
• Monitoring temperature and pressure for solar systems, with basic automation.
• Monitoring heat pump operation with data presentation on Internet graphs.
• Monitoring supply voltage and automatic switching to backup sources.
• Remote energy consumption monitoring via Modbus meters or pulse inputs.
• Remote switching of devices from a simple operator panel.
• Network-based (wired or wireless) command transmission between multiple LK devices.

SMART HOME:

• Automated control based on time and specific settings, e.g., turning on a heater when the temperature drops below a set level.
• Remote control of outputs via mobile devices.
• Automated light or device control based on schedule or remote commands.
• Combined control from wall switches and the device.
• Dusk switch functionality.

RENEWABLE ENERGY:

• Monitoring solar panel performance.
• Monitoring wind turbine performance.
• Basic battery charging control.
• Measuring DC energy consumption.
• Measuring AC energy consumption and inverter production.

AGRICULTURE:

• Monitoring and controlling temperature and humidity in greenhouses.
• Cyclical control of feeders and other equipment in animal farming.
• 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 Voltage DC sensor (for PV, under development).
• Temperature sensor: PT1000 (with additional resistor).
• Flood sensor (water).

Logic Inputs:

• Magnetic door sensors.
• Energy 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):

• Bi-directional energy 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 plugs with Tasmota firmware.
• Displaying sensor readings on IP camera images.