An old idea with a new name
People have been trying to automate the home for a long time. The phrase “smart home” is relatively recent, but the underlying idea, making a house respond to people with less manual effort, is much older. This article follows the broad arc, and it is cautious about exact dates and “firsts” because the history of home technology involves many small, overlapping inventions and the sources often disagree.
Early steps: remote control and timers
Some of the earliest forms of home automation were simple mechanical and electrical timers, such as switches that turned lights or appliances on at set times, and thermostats that kept a room near a chosen temperature. These did not communicate with anything; they just followed a rule.
Wireless remote controls for televisions appeared in the middle of the twentieth century, first using wires, then light and ultrasound, and later infrared. They taught households an important habit: controlling a device from across the room. Infrared remotes in particular became so common that people still associate “remote control” with them. They worked only in line of sight and only with the device they came with, which is a limit that shaped what came later.
The 1970s to the 1990s: signals over home wiring
Around the 1970s, engineers began sending control signals through a building’s existing electrical wiring. The idea was appealing because no new cables were needed: plug a small module into an outlet, attach a lamp, and a controller elsewhere in the house could switch it. Hobbyists embraced these powerline systems, and some of them stayed in use for decades.
They also had weaknesses that are commonly noted. Signals could be weakened or disrupted by electrical noise from other appliances, and there was little security, since the system was not designed for a world of outside attackers. Setup could be fiddly, and the devices rarely worked with products from other makers.
During the same period, “home automation” for wealthy buyers and for new construction often meant a professionally installed system with dedicated control wiring, keypads and wall panels. These could run lighting, heating and audio, but they were costly and typically designed by a specialist, so they did not reach ordinary homes in large numbers.
Writers and designers in these decades also imagined fully automated houses, often in exhibitions and magazines. Many of those visions were more ambitious than the hardware of the time could deliver, which is one reason “smart home” became associated with gadgets that looked impressive but were awkward to live with.
Wireless standards and the internet arrive
In the 2000s, low-power radio standards designed for small devices began to appear, along with growing home use of wireless networking. These made it cheaper to add a sensor or a switch without cutting into walls. Several competing standards emerged, and each had its own supporters. That fragmentation became one of the defining problems of the field.
At the same time, broadband internet reached more households, and phones became pocket-sized computers. This changed the model. Instead of a dedicated wall panel, the control surface could be an app. A device could also report to an online service, so you could check a camera or adjust a thermostat while away from home.
Smart home devices today
Today’s smart home devices include:
- thermostats that learn a schedule or respond to occupancy
- lights and plugs controllable from a phone
- door locks, doorbells with cameras and security sensors
- speakers and displays that respond to voice commands
- appliances such as washers and robot vacuums that connect to a network
- sensors for leaks, smoke and open windows
Voice control depends on speech recognition, usually processed in part by remote servers, which is one reason people ask where recordings go. Devices also commonly use machine learning, for example to estimate when a home is empty. How much these features actually help varies by household. Many people find a few devices, such as a thermostat or lighting schedule, worth using, while others find the extras unneeded.
All of these belong to the wider internet of things, the term for everyday objects that are connected to networks. A home is a small-scale version of the same pattern used in factories and cities.
Persistent problems
Several issues have followed smart homes from the early days to the present.
Compatibility. Devices from different makers have not always worked together. Industry groups have tried to create shared standards, but older products may not be supported, and a mixed household can still need several apps.
Privacy. Connected cameras, microphones and usage patterns can reveal when people are home and how they live. Questions about what data is collected and for how long are central to data privacy, and families with children face extra considerations around children online privacy.
Security. A device that is rarely updated can become a weak point in a home network. Basic habits such as software updates, changing default passwords and using two-factor authentication on the accounts that control devices are widely recommended.
Longevity. A light switch can last decades; a connected one may depend on a company’s servers or app. If support ends, features may stop working. When buying, it is reasonable to ask what happens if the service goes away.
Reliability. Some people find that automation which fails, even occasionally, is more irritating than a plain switch. A good design usually keeps a manual option.
Looking back and ahead
The story of smart homes is less a straight line of progress than a series of ideas that waited for the right enabling technology: cheap radios, fast home networks and capable phones. Along the way, the features people kept were usually simple ones, such as scheduled heating or remote checks, while elaborate whole-house schemes were slower to catch on.
Forecasts about where this goes next are uncertain. Some expect more devices to process data locally, others expect broader sharing of energy information with the electricity network, and some expect little change beyond steady refinement. Whatever happens, a sensible approach for a household is to start with a specific need, check how a device handles data and updates, and add more only if it proves useful.