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Smart homes built gadget by gadget

| Saturday, Jan. 9, 2016, 9:00 p.m.
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LAS VEGAS, NV - JANUARY 07: The Vivint Doorbell Camera is displayed at CES 2016 at the Sands Expo and Convention Center on January 7, 2016 in Las Vegas, Nevada. It works with the Vivint Sky smart home system and features two-way talk via a built-in microphone and speaker, a 180-degree camera lens with night vision, and on-demand access to 30-second video clips it records. Customers able to see who is at the door on their smartphones can lock or unlock the door remotely. CES, the world's largest annual consumer technology trade show, runs through January 9 and features 3,600 exhibitors showing off their latest products and services to more than 150,000 attendees. (Photo by Ethan Miller/Getty Images)

NEW YORK — A fully automated home is still years away, but the building blocks are already here: the phone that turns on the coffee maker from the bedroom, the thermostat that controls the lights when you're away, the window shades that lift when you say “good morning.”

Although these still aren't items most people seek out, they're catching on. Research firm Strategy Analytics estimates that the number of U.S. households with some form of smart-home system grew 30 percent in 2015 to 27 million, or about 1 in 5.

With the backing of big names such as Samsung, Apple and Nest, a sister company of Google, smart-home functionality is slowly creeping into everyday homes. Even Amazon is getting involved with its Echo speaker that can respond to voice commands. At the CES gadget show in Las Vegas, the scheduled topic of a Samsung keynote Thursday is the smart home of today — not tomorrow or five years from now.

Here's how you might start building your own smart home:

Devices first, connectivity later

Drop the notion that you have to rewire your entire home and replace all of your lights and appliances.

Nest, a maker of smart-home products, says it doesn't market its camera, smoke alarm and thermostat as smart-home products, but as products that happen to tap the Internet for increased functionality. From there, gadgets can start talking to each other, whether they're made by the same manufacturer or by third parties.

Andrew Brooks, co-founder of Samsung's smart-home business, SmartThings, says households often start with security-related products, such as locks and garage doors, and evolve from there. Samsung's new smart TVs will have built-in smart-home capabilities, negating the need to buy a hub to get started.

What about your existing lights, TVs and coffee makers? You can buy smart plugs; with a voice command or tap of an app, you can then turn devices on or off once you've plugged them in.

What you can do with it

During a trip, the Nest camera can be checked through an app to confirm that lights are off. If they aren't, Siri could turn them off if the lights are connected to an iDevices smart plug synced with Apple's HomeKit system — and thus with Siri. Motion sensors synced with a SmartThings hub can tell the user whether anyone has been in the apartment. A Mr. Coffee machine can start brewing with a tap of the phone, thanks to integration with Belkin's WeMo system.

It's relatively straightforward to add components as time and budgets permit. With smart locks, doors automatically lock when you leave. Smart appliances such as the Nest thermostat can also help save energy. Smart-home systems also can incorporate window shades and irrigation systems — perhaps the sprinklers briefly turn off as you walk by.

Though apps try to make the setup easy, there's still a lot to think about. To get the most out of a smart home, you need to assign lights and appliances to specific rooms on the app. Then you need to enable automation through the app — figuring out which devices do what when you say “good morning” or “good night.” It isn't too difficult for tech enthusiasts to figure out, but it could be challenging for folks who want things that “just work.”

The can be quirks in setup. If main lights are connected to a smart plug, for example, voice commands and the smartphone app effectively take control, meaning one actually can't use the wall switch to turn the lights back on. It takes a few extra seconds to activate Siri and tell her what to do.

Besides Samsung, Apple, Nest, Amazon and WeMo, there are smaller systems from the likes of Lowes and Insteon. Some systems work with others, at least in some respects, but it's far from guaranteed. Most people won't be trying out competing systems, but these examples do illustrate how your first smart device might lock you into an “ecosystem” controlled by a single company.

Other considerations

It's comforting to know whether your toaster oven is off, but then you run the risk of accidentally issuing a command to turn it on. There are some safety mechanisms; a smart oven from Whirlpool ships without the ability to turn it on remotely (though you could decide to activate that function). You need to be aware of safety hazards — and ask.

In addition, you'll have to trust that these systems are secure. Apple, for instance, requires that HomeKit devices use chips it approves for security, but there might be other vulnerable points once data leave the HomeKit environment.

Other companies make similar promises on security.

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