Smart Speakers, Smart Displays and Hubs: How Smart Home Control Works

Building a smart home can feel like learning a new language. You have lights, locks, plugs, and sensors, but they need a way to talk to each other and to you. That’s where the central controller comes in. Often called a smart home hub, this device—or the brains built into a smart speaker or display—is the translator and command center. It bridges the gap between your phone, your Wi-Fi network, and the various wireless signals your smart devices use. Understanding how this control works is key to choosing devices that will work together smoothly, whether you’re starting with a single smart bulb or planning a whole-home setup.

What a Smart Home Controller Does

Think of your smart home controller as the central nervous system. Its primary job is to facilitate communication. Many battery-powered smart devices, such as sensors, don’t connect directly to Wi-Fi because Wi-Fi consumes a lot of power for small sensors and isn’t always the most efficient way for devices to talk to each other locally. Instead, they often use low-power, short-range wireless protocols like Zigbee, Z-Wave, or Thread.

The hub or built-in controller has the necessary radios to speak these protocols. It receives a command from your phone (like “turn on the kitchen light”) over Wi-Fi, translates that command into Zigbee, Z-Wave, or Thread, and sends it to the correct light bulb. It also works in reverse, receiving status updates from sensors and relaying them to your phone app. This allows for local automation (like a motion sensor turning on a light) without every command needing to travel out to the internet and back, which can be faster and more reliable.

The Types of Controllers: Hubs, Speakers, and Displays

Controller functionality comes in a few different forms, each with its own strengths.

Dedicated Smart Home Hubs

A dedicated smart home hub is a single-purpose device, often a small box that plugs into your router. These hubs are typically built by companies that specialize in a particular protocol, like Zigbee or Z-Wave. Their main advantage is broad compatibility and stability; they are designed specifically to manage a network of many devices reliably. They are a common choice for more advanced setups or for integrating a wide variety of device brands that use the same underlying protocol.

Smart Speakers and Displays with Built-in Hubs

Many popular smart speakers and displays now have hub capabilities built right in. For example, certain models contain a Zigbee radio, allowing them to control Zigbee bulbs, sensors, and plugs directly without a separate hub. This is a convenient all-in-one solution for many people. A smart display adds the benefit of a touchscreen for visual feedback, video calls, or viewing camera feeds alongside voice control. These devices primarily use your Wi-Fi network for their connection to the internet and your phone.

The Role of Your Phone and Wi-Fi

Your smartphone is also a controller, but usually through your Wi-Fi network. Many simpler smart devices—like Wi-Fi smart plugs or cameras—connect directly to your Wi-Fi and are controlled solely through an app on your phone. For these, no additional hub is needed. However, your phone isn’t always home, and it doesn’t have the radios to directly control Zigbee or Thread devices. That’s why a stationary hub or speaker is essential for those protocols and for creating automations that run locally.

Understanding Thread and Matter

Two newer technologies are changing the controller landscape: Thread and Matter.

Thread: The Mesh Network

Thread is a low-power, wireless networking protocol designed specifically for the home. Like Zigbee, it creates a mesh network where devices extend the network’s range by passing signals along. A key component is the Thread Border Router. This is a device that connects the Thread mesh network to your home Wi-Fi and the wider internet. Many new smart speakers, displays, and hubs are now acting as Thread Border Routers. If you have a Thread device (like a smart plug) and a compatible border router, they can form a robust, local network.

Matter: The Universal Translator

Matter is an application layer built on top of existing protocols like Wi-Fi, Thread, and Ethernet. Think of it as a universal language. Its goal is interoperability: a Matter-certified light bulb should work seamlessly with a Matter controller from any different brand. A device that supports Matter can be set up and controlled by multiple ecosystems simultaneously—like Apple Home, Google Home, and Amazon Alexa—from a single device. For this to work, you need a Matter Controller. This is a feature built into hubs, speakers, or phones that commissions (sets up) and manages Matter devices. Most new smart speakers and displays from major brands are being updated to become Matter Controllers.

Choosing Your Smart Home Ecosystem

Your choice of controller is deeply tied to your choice of ecosystem. An ecosystem is the platform—like Amazon Alexa, Google Assistant, Apple HomeKit/Siri, or Samsung SmartThings—that provides the voice assistant, the main app interface, and the underlying software. Often, buying a smart speaker means you’re buying into that company’s ecosystem.

Your ecosystem’s app is where you’ll group devices, create automation routines, and see everything in one place. While Matter improves cross-compatibility, the primary user experience will still be through the ecosystem you use most. Therefore, consider which voice assistant you prefer, which phone ecosystem you’re in (iOS or Android), and which app interface feels most intuitive to you. For a deeper dive on this starting point, see our Smart Home for Beginners guide.

It’s also wise to think about the other devices you plan to add. For a deep look at smart lighting choices, our article on smart bulbs vs. smart switches can help. If security is a priority, understanding the requirements for cameras, doorbells, and locks is crucial before you buy.

FAQ

Do I need a smart home hub?

It depends on your devices. If you only buy Wi-Fi-based smart devices, you can control them directly from your phone and may not need a separate hub. However, if you want devices that use Zigbee, Z-Wave, or Thread, or if you want to create complex, reliable local automations, a hub or a speaker with a built-in hub is necessary.

What’s the difference between a Matter Controller and a Thread Border Router?

A Thread Border Router is a hardware function that connects a Thread mesh network to your Wi-Fi. A Matter Controller is a software function in a device (like a hub, phone, or speaker) that sets up and manages Matter-certified devices. Many devices, like the latest smart speakers, are both.

Can I mix devices from different ecosystems?

Yes, but it can be complicated. Before Matter, you often needed multiple apps and sometimes multiple hubs. Matter is designed to solve this. With a Matter Controller, a Matter-certified device from Brand A should be controllable in the apps of Brands B and C, allowing for much easier mixing.

Will my old devices work with a new Matter system?

Non-Matter devices (often called “legacy” devices) will continue to work within their original ecosystem. Some may receive a firmware update to become Matter-compatible. Others will need to be controlled through their original hub and app, which can often be linked or “bridged” into a newer ecosystem like Google Home or Alexa.

Is a smart speaker or a dedicated hub better?

A smart speaker with a built-in hub is excellent for convenience and voice control, often at a lower entry cost. A dedicated hub can offer more advanced automation features, support for more device types (like Z-Wave), and potentially greater stability for larger networks of devices. Your choice depends on the complexity of your plans.