Larnitech Smart Home System Architecture

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The Main Gateway is the core device of the system. Its main task is to configure the system, and provide the logic for

its operation. It also keeps track of the sensors data and provides authorized access to the system. The Main Gateway is connected to the local network. It has 2 CAN bus ports.

The CAN bus is used to connect the sensors and actuators to the system. Terminators, 120 Ohm resistors, need to be

installed at the end of the CAN bus.

As can be seen from the table below, a Four-wire bus is used (two twisted pairs) with a maximum length of a eight hundred

metres. A maximum of 50 devices can be connected to each CAN bus.

The following diagram shows how modules can be connected to the system. In the drawing below a 7-channel

actuator, a leak control module and a heating control module have been connected to the first CAN bus.

The second CAN bus has a four-in-one multi-sensor, a dimmer and a two-channel pattress box space actuator. In such

a manner up to 100 devices can be connected to the main gateway.

In its turn, the main gateway is connected to the Local Area Network.


If the building where the system is set up has several floors or 100 devices are not sufficient to perform all of your

tasks, additional extension modules are connected to the system. Each of them gives the user the ability to connect 100 more devices.

As many extension modules as needed may be added, therefore the system can be expanded almost indefinitely. In

this way via the Local Area Network numerous CAN networks can be united into one network with a total number of up to 1000 controlled modules.

Tablets or smartphones get connected to the local area network via Wi-Fi. After installing the Larnitech application on

your tablet or phone, you can control the devices in the system.

The main gateway is connected to the cloud, which allows to get authorized remote access to the Smart Home.


The multiroom system is integrated via the local area network. The media points allow to playing music from your

home storage and Internet radio. The multiroom system is deeply integrated into the Smart Home system, which allows using it in various scenarios. For example, when you leave home, the scenario ‘I’m gone’ can be activated. In this scenario the system turns off the lighting, puts the climate control system in the energy saving mode and with the help of the multiroom system can tell you about the unlocked back door or an open window. Many media points can be connected to the system, which will allow listening to music in various areas. The music may be taken from your network attached storage (NAS).

The system allows the use of the intercom. When someone rings your doorbell, the multiroom system will play the

notification about it. Of course, it will only do that in the areas where you want the notification to be played. If the property owner is not at home, the system will let them speak to the visitor via the application on their smartphone or tablet.

The multiroom system lets the user control smart TV and other devices which support the DLNA standard.


If you connect the IP cameras to the system, you will be able to see the corresponding areas through our application.


The API can be provided by Larnitech, which lets the third-party applications, after they are authorized, get the

information from the Smart Home system and control its devices.

Connecting an additional power supply to the CAN bus