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Smart Home - The "intelligent home"
Can you save energy with a smart home? Are there one or many different solutions? Do the available products and systems make sense for all residents and at all ages? Can an intelligent building be manipulated from the outside? What does a smart home cost? Where can you find qualified craftsmen? And what should consumers pay attention to when purchasing and using?
We answer these and other questions about the smart home.
Smart Home - what is it actually?
Today's new buildings as well as modernized old buildings should be economical, sustainable, energy-efficient, comfortable and usable over the long term. Against this background, a steadily growing market for technology-assisted living is gradually establishing itself. Individual products and the networking of building technology, household appliances and services are increasingly being offered in the areas of home automation and electronics as well as communication for private living as well. These technical solutions should interact intelligently, intuitively and safely.
According to manufacturers, if all possibilities are exhausted, energy consumption will be reduced, the building will be safer and comfort increased. As a result, the house offers more quality of living for people of all ages. The technology, which can be individually adapted to needs, offers the prospect of making living smart - that is, pleasant, smart, clever and intelligent. This is why the term smart home is used more and more frequently in new buildings, but also in modernizations.
The English term "smart home" - translated as "intelligent home" - is not clearly defined. Occasionally it is also used for intelligent individual solutions such as heating controls. Most of the time, and this is also the case here, it refers to systems made up of several networked products from different areas. Likewise, a fully networked and "intelligent" house is generally referred to as a smart home.
How does a smart home work?
A smart home typically consists of several elements:
- from the Terminals or the so-called
Actuatorsthat are to be included in the intelligent control. This includes, for example, radiator controls, lamps, shutters, blinds and ventilation systems, but also televisions and stereo systems or speakers. Some washing machines and stoves can also be integrated into a smart home.
- from one or more Input devices. These can be touch displays, room temperature controllers, tablets and smartphones, but also classic-looking light switches. Control via voice commands is also becoming more and more widespread.
With the help of these human-to-smart home interfaces, it is easy to check whether the lights in a certain room have gone out or the room temperatures are in the desired range. If this is not the case, a direct switching command can also be issued via these devices.
- out Sensors. These are required, for example, to measure the room temperature, to register whether doors and windows are open or closed, to determine the brightness in rooms or to detect the presence of people.
- from a central control unit, the so-called Gatewaywhich receives all sensor data and sends commands to heating control valves or other actuators, for example. The gateway enables the networked devices to communicate with one another. It is practically the "brain" of the smart home. The gateway can be controlled by the users via the input devices. Depending on the system, direct control of the individual devices is still possible regardless of this. A possible connection to the Internet is also established via the gateway.
- one Networkingthat enables end devices and gateways to come into contact with one another. The connection can be made by cable or by radio. Some systems also use the existing power grid ("Powerline"). Naturally, cables have to be laid for wired systems, which in turn requires forward-looking building technology planning. In old buildings in particular, radio-controlled systems are easier to implement without interfering with the building fabric. They are also suitable for rented apartments, as they can be dismantled again without any problems and can be relocated.
How do you operate a smart home?
Smart home systems can be operated in different ways. Particularly small or highly automated systems require almost no operation of their own: if you press a self-adhesive light switch, you can use it to control the light as usual. In this case, it goes unnoticed that a smart home installation is behind it. Smart home technology is also hidden behind the central power circuit in hotel rooms with a keycard.
Another possibility are control devices such as small rotary switches, with the help of which the room temperature can be increased or decreased centrally.
Often, however, there are also control panels with touch displays installed on the wall. Here your own house installation can be used and controlled with provider-specific user interfaces. Often, logical function groups are combined. There are separate control fields for lighting control, heating and ventilation or air conditioning. The room-by-room display of all functions is also conceivable. The devices and actuators are then influenced via virtual sliders and switches.
With the spread of smartphones and tablet PCs, user interfaces for building control are increasingly being made available on these mobile devices.
What are the benefits of smart homes?
The benefits of a smart home depend not only on the products and system chosen, but also on one's own expectations. Added value can arise when energy is saved, comfort is increased and / or safety is improved. A popular and effective application is, for example, the automatic lowering of the room temperature when absent, combined with reheating in good time before returning home. Depending on the previous behavior, this saves between two and eight percent heating costs and increases comfort. Another example is equipping the house with energy-saving lighting and motion detectors.
This increases comfort and safety at typical stumbling blocks in the house, such as stairways or narrow hallways, and less energy is used. Motion detectors in the outside area of the house and house access also improve protection against burglary.
If you opt for a key card instead of a front door key, for example, as is often used in hotels, three things are achieved by automatically switching off all electrical devices - with the exception of the absolutely necessary devices in stand-by or normal operation such as refrigerators and freezers :
- 1. An energy saving,
- 2. an increase in comfort and
- 3. The certainty that devices such as the stove or the coffee machine cannot represent a source of danger.
If the door locks automatically after removing the keycard, there is an additional security effect.
If you don't want to use a keycard, the same effect can be implemented, for example, with a central on / off switch on the entrance door, operation via smartphone or a fingerprint sensor on the front door. In this case, the heating can be turned on before entering the house and the door can be opened with a fingerprint. So the children can come home without their own keys, with full shopping bags there is no need to look for keys or cards and older residents do not have to use their glasses first.
What does a smart home solution cost?
The costs for a smart home vary greatly, depending on which networking technology you choose and how many end devices you want to integrate. Entry-level offers for networked technology based on radio standards start at several hundred euros. It can make sense to choose basic equipment first, which can be expanded if necessary. Care should be taken to choose an open system. A cable-based system is generally more expensive than a radio-based one. Several thousand euros have to be invested here. There is no upper limit to the costs of a smart home.
What are the differences between open and closed systems?
There are many different technologies in smart home. Open systems have a standard supported by various providers of smart home solutions. This means that products from different manufacturers can be combined with one another. Examples are Bluetooth LE, EnOcean, WLAN, Z-Wave, ZigBee and KNX. With the exception of the latter, all are radio systems.
Closed systems, on the other hand, are not compatible with devices from other providers. If a provider does not offer a technical solution for a specific task, technology from another manufacturer cannot be used.
Cable or radio?
The installation of wired systems is only advisable for a renovation or a new building that is already pending. A separate line must be laid for each point of consumption that is to be accessed. This also contributes to the sometimes considerable costs of such a system. In return, the data transfer is very fast and the susceptibility to failure is very low.
Radio-based systems can be installed more easily than wired systems, even if the effort involved, depending on the degree of automation, can be very different. However, radio systems can be more susceptible to interference.
There are also systems that use the power lines in the house for data transmission. Then there is often talk of "powerline". However, power lines can transmit less data than specially laid cables and are more prone to failure. This system is therefore not suitable for data transmission over long distances.
There is also the option of connecting the systems with one another and thus relying on a combined cable and radio installation. With a few exceptions (e.g. EnOcean), the batteries must be changed in radio-based systems. However, there are also mixed solutions in which actuators are inserted into the power line in a flush-mounted installation and are supplied with energy from there, but receive their commands via radio.
Install systems yourself or have them installed?
Some simple systems can be installed by yourself with a little skill and craftsmanship. However, wired systems require expert planning and installation. It is also advisable to consult specialist companies for more complex wireless solutions.
If programming is required, an installer or building system integrator should do the initial programming in most cases.
In the meantime, the market also offers systems that are delivered fully programmed, but still offer the user the opportunity to make changes.
Are my details safe?
The use of smart home products is often associated with extensive collection and processing of personal data.
Smart home devices are usually controlled via an app on a tablet or smartphone. For the use of these apps, this is usually the case Creating a user account required by the provider. In the course of this, for the authentication data such as e-mail address and sometimes also telephone number, date of birth or postal address are given.
Most of the smart home devices are permanently connected to the internet and save User data in a cloud, i.e. on the servers of the device manufacturers or third-party providers such as Amazon or Microsoft. Sometimes this includes sensitive data how
- Video recordings from the apartment that are created and transmitted by a surveillance camera
- Location data transmitted, for example, by a vacuum robot. With this data, an exact measurement of living spaces is sometimes possible
- Voice commands from smart speakers such as Amazon Echo or Google Home, some of which are evaluated by the respective providers to improve voice recognition
For the user, it is often not clear which data is being collected and which sensors smart home devices really have: For example, many devices, such as smart TVs or intelligent smoke detectors, have Microphones integrated what is not always obvious at first glance. Collected consumption data or times when the door is locked or opened allow conclusions to be drawn about lifestyle habits or the presence and absence of residents. Vital data from body sensors provide information about the state of health.
The transmitted data is not only used by the smart home provider himself, but often as well processed by third parties. These include, for example, cloud operators on whose servers the data is stored. But also other providers that are integrated by the device manufacturer, such as Facebook. These collaborations between smart home providers and third-party providers can be problematic from a data protection perspective, as some studies make clear:
- As part of a study by the market watchdog team at the consumer advice center in North Rhine-Westphalia, the Federal Office for Information Security (BSI) tested 4 smart home devices from the security technology sector for their IT security. It was found that with one of the surveillance cameras tested, the associated app transmits data about app usage and the smartphone to Facebook via a programming interface. As a result, there is a risk that Facebook can identify the user by linking this data with an existing Facebook account and the data collected can then be linked to a person.
- A study by AV-TEST, which tested 4 smart vacuum robots, showed: the app of a Xiaomi device had integrated a large number of third-party modules through which user data could be sent to e.g. Facebook, Alibaba, Tencent or Airbnb.
Please also note: When using a smart home system, the personal rights of third parties may be impaired. This can apply to visitors as well as to the cleaning staff, who may be filmed by a surveillance camera without having given their prior consent. Video surveillance of children or relatives in need of care can also be critical from a data protection perspective. Video surveillance in non-public areas is not clearly regulated in the EU General Data Protection Regulation.
Data security: how do I protect my smart home?
The BSI warns that basically all internet-enabled devices can be potential targets for cyber criminals. In the smart home, 4 potential sources of danger can be identified that can offer attack surfaces or gateways for hackers:
- Devices in the smart home
The devices themselves can often be a fundamental weak point if they have technical weak points. The more smart devices are integrated into a system, the more vulnerable the system as a whole is. A fundamental problem: By taking over a device in the smart home system, other devices in the same system can also be hijacked. That means: If, for example, the smart light bulb is hacked, unauthorized persons may gain access to all devices connected to the local network, such as the surveillance camera, or even take over the home PC.
- User accounts
Smart home services with a user account are usually only protected by a password. It is therefore important to choose a strong password to protect yourself from hackers.
- Data transfer
Another source of danger is the transmission path of the data from the app to the cloud or to the corresponding server. Here, it is important that modern encryption technology is used during transmission so that the data sent is not intercepted in plain text on its transport path can be read.
- Storage of user data
Another source of risk is the storage of user data in the cloud, i.e. on the provider's servers or on external servers operated by third parties. Data breaches, for example when data is freely accessible on the Internet without password protection and encryption, can result in sensitive data becoming accessible to third parties.
Tips for more data security with smart home devices
- Find out about data protection and IT security before and after your purchase:
- What data is generated when using it?
- Does a user account have to be created when registering and which data is requested?
- Which access authorizations does the control app need? For example, is the location recorded?
- Are personal data stored in the cloud?
- Is data transmitted in encrypted form?
- Is there a possibility of two-factor authentication?
- How long and how often is the device supplied with security updates?
- Take privacy-friendly settings for the associated device apps as early as possible during setup. Take a look at the default settings during setup and change permissions such as location tracking if it is not necessary for using the app. Access authorizations can also be adjusted retrospectively via the settings.
- Choose one secure password. So-called "strong" passwords contain capital letters, numbers and special characters. Change default passwords immediately. Renew your password at regular intervals.
- A Two-factor authentication in principle increases security when accessing smart systems. Two steps are carried out to authenticate the user. There are various methods for this: For example, after entering the password in the user account, the provider sends a code to the smartphone, which must also be entered. In this way, for example, "phishing" can be prevented.
- Devices and associated apps should always be up to date, available updates should be installed promptly.
- Set up separate router networks for PC and your smart home. In this way, an attacker does not automatically gain access to the home PC if he has gained access to the smart home system or device.
- Be careful with used smart home devices: When selling your smart home devices, make sure that there are no more sensitive data traces such as your WiFi access data on them. If in doubt, also contact the device manufacturer. The purchase of used devices can also pose a risk, for example if the devices have been deliberately manipulated or if previous owners can continue to access the data on the devices sold due to security gaps.
What is the relationship between a smart home and a smart meter?
A smart home can become even smarter if the electrical devices are not only networked with one another, but can also react to information from the electricity market. In other words, if electricity prices are cheap on the market, suppliers could pass this information on to households so that electricity-intensive devices can be used precisely in these time windows. Billing would then be done via a so-called smart meter, an intelligent measuring system that can record different tariffs at different times.
Some manufacturers of electrical appliances and white goods already offer devices that have a "Smart Grid Ready" standard ("Smart Grid" = English for "intelligent network"). However, it cannot be foreseen at the moment when energy suppliers will also pass on electricity market impulses to end customers.
So far, smart meters have not been installed across the board.
Can you save energy with a smart home?
Basically, there is the possibility of saving energy with a smart home. How high the savings will be cannot be quantified across the board. This depends, among other things, on the individual usage behavior, the structure of the building, the size of the building and the selected smart home equipment.
The control of the heating offers an energy saving potential of an average of eight percent, especially if the thermostats have not been controlled manually until now. The information provided by manufacturers on maximum energy savings should, however, be viewed critically and can sometimes be exaggerated.
Central control of electrical devices can also save energy. However, the savings here are rather small. When purchasing smart home devices, it makes sense to ensure that your own consumption is low, so that the switchable socket does not suddenly cause a higher standby consumption than the device to be switched.
For example, some manufacturers produce switches that use the pressure when this switch is pressed to generate energy and thus do not consume any additional energy. However, if you equip every room in a household with its own touchpad for operation, the total energy consumption can even increase with these control elements.
Who can I contact if I would like to have Smart Home products installed on me?
For a new building as well as for more extensive measures in an old building, it makes sense to seek advice from an architect who already has experience in planning smart homes, or to involve an appropriately experienced building services company. In the case of smaller measures, the electrical trade is a suitable contact, whereby it must be ensured that the electrician has completed a Smart Home training course. Such qualification measures are offered, among other things, by industry associations, special training facilities and the chambers of crafts.
Certified quality labels are, for example: specialist company KOMFORT barrier-free, specialist company for innovative living, specialist advisor living comfort, specialist company for senior and disabled-friendly electrical engineering, building system integrator, specialist company for networked building technology, specialist planner for barrier-free & comfortable living.
This content was created by the joint editorial team in cooperation with the North Rhine-Westphalia consumer center for the network of consumer centers in Germany.
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