
The best method to begin with Zigbee or Thread simply acquired even higher, with House Assistant Join ZBT-2. This USB adapter plugs into your House Assistant system and opens up a world of sensible machine choices. Between its exactly tuned antenna and next-generation chip, it’s a giant step up for anybody seeking to join Zigbee, Thread, or Matter units on to House Assistant.
For all our Zigbee followers, this is perhaps the most effective improve you’ll make all 12 months. We’ve squeezed each inch out of this expertise, giving it the most effective vary, velocity, and stability potential. The identical will be mentioned for our Thread-heads on the market (yeah, I simply got here up with that cool nickname 😎), making Matter or ESPHome Thread
Should you’re a type of folks nonetheless rocking three completely different hubs, what are you ready for… one other big server outage to take down your sensible dwelling? Ditch these cloud hubs and take again your privateness at present. As an added bonus, your units will possible get extra controls, vary, and resilience.
Obtainable at present beginning at $49 and €45 (that’s the MSRP, and pricing will range by retailer). Designed and constructed by Nabu Casa and the Open House Basis, each buy helps fund the event of House Assistant. For fast specs, particulars, and the place to purchase, go to our stunning House Assistant Join ZBT-2 web page.
What are Zigbee, Thread, and Matter?
The quick reply is that they’re all open requirements that permit sensible units speak on to your sensible hub of selection, like House Assistant. We love open requirements as a result of they don’t depend on the cloud, which implies your units are absolutely below your management at dwelling, with no danger of turning right into a paperweight if the producer will get bored of paying the server charges. Additionally, when used with House Assistant, your sensible dwelling information by no means wants to depart your house, which is at all times higher for privateness.
Zigbee is a wi-fi customary that’s been a cornerstone of sensible dwelling expertise for practically twenty years, with 1000’s of units from manufacturers like Philips Hue, IKEA, Aqara, Sonoff, frient, and ThirdReality. There’s a very good probability you have already got a few of these units in your house, and so they’ll have their very own hubs, which frankly are simply taking over further area, as every thing is best linked proper to House Assistant 😉.
Matter is the massive new customary – its tech is cutting-edge, and rising actually quick. It will possibly use Wi-Fi to speak to units, but when that machine is battery-powered, it’ll in all probability use Thread as a substitute. Matter units that use Thread are getting actually good, and lots of are Works with House Assistant
Whether or not you arrange your Join ZBT-2 to make use of Zigbee or Thread, you’ll be able to’t actually go improper, as each requirements have units for practically each sensible dwelling want. Each give units nice battery life, take some pressure off your Wi-Fi, and counterintuitively, the extra units you could have, the higher the vary and stability will be.
Standing on the shoulders of giants
In 2022, we launched House Assistant Join ZBT-1 (initially referred to as SkyConnect), our first product within the Join line and first USB adapter. Join ZBT-1 was designed to be the simplest, most secure method to join Zigbee units to House Assistant. It additionally got here with Thread connectivity help, which was very new on the time. All these years later, it continues to obtain software program help and is a group favourite.
Gross sales of Join ZBT-1 helped fund House Assistant’s growth, and we realized a lot that has influenced its subsequent iteration. Alas, as a lot as we love our little Join ZBT-1, at present we’re saying goodbye. We’ve now ended manufacturing of Join ZBT-1, however software program help will proceed. Should you’re nonetheless utilizing Join ZBT-1, count on it to maintain working far into the long run.
If you’re seeking to improve your Zigbee community with a Join ZBT-2, don’t overlook you’ll be able to proceed to make use of your Join ZBT-1 as a method to dip your toes into the world of Thread – it’s very simple to change working modes
Upgrading every thing
In comparison with its predecessor, this model has upgraded every thing. First off, we’ve doubled the product quantity from ZBT-1 to ZBT-2… that’s 2x higher already! However there’s positively extra.
Follow an antenna
First off, to realize peak efficiency, we moved away from the small “stick” kind issue. Small USB sticks are handy, however USB ports and close by electronics can create interference that weakens the sign. With Join ZBT-1, we really helpful utilizing a USB extension cable to maintain the adapter away from noise.

The antenna has gone from security pin-sized 🧷, to tablespoon-sized 🥄
With Join ZBT-2, we’ve designed away this subject. It’s a lot simpler to correctly place because it’s now a free-standing antenna and base, which is completely tuned for Zigbee and Thread. The bigger antenna just isn’t solely good at broadcasting to additional away units, however can be good at listening out for faint indicators from distant units. We even optimized the bottom, which acts as a “floor aircraft”, boosting the antenna’s efficiency. It features a 1.5 m (4.9 ft) USB cable that allows you to place it in a great spot to keep away from any interference.
4 occasions the velocity
Inside Join ZBT-2 is the Silicon Labs MG24, a sophisticated Zigbee/Thread system-on-chip. In comparison with the MG21 utilized in Join ZBT-1, it brings increased processing energy and higher sensitivity to weak indicators.

Extra baud, the higher 😜
We additionally took the chance to quadruple the inner communications velocity of the chip – taking the baud price from 115,200 bps to 460,800 bps. In our testing, we noticed constant enhancements in machine responsiveness. Don’t count on your units to activate 4 occasions quicker, however you’ll really feel the distinction when turning on a number of units concurrently.
Constructed for House Assistant
It’s very easy to reap the benefits of all this efficiency, as we at all times work to make House Assistant {hardware} tremendous simple to start out with. Simply plug within the machine by way of the included cable right into a spare USB port in your House Assistant system, and the setup wizard will information you thru every thing. This all works so properly as a result of the identical individuals who constructed Zigbee and Thread into House Assistant additionally helped construct Join ZBT-2.
You can begin a brand new Zigbee or Thread community in minutes, or use our improved migration instruments to maneuver an present community over. It’s an easy improve, and most adapters migrate with just some clicks. Better of all, each House Assistant person upgrading to new adapters will profit from these new migration instruments. Simply one other instance of how {hardware} gross sales assist stage up our software program growth.
Compatibility and adaptability
House Assistant Join ZBT-2 helps Zigbee 3.0 (and sure, we’re Zigbee 4.0 help as properly) and is maintaining tempo with Thread’s fast growth. We’ve examined it working nice with ZHA, zigpy-cli, Zigbee2MQTT
If it’s a Zigbee-certified machine or Matter-certified machine that makes use of Thread, it ought to work out of the field. House Assistant already has one of many widest compatibility lists on the earth, and our group repeatedly expands it with each new launch. For manufacturers that help the performance, there are additionally Over-the-Air (OTA) firmware updates for units.
Simply notice: Join ZBT-2 can solely use one protocol at a time, that means you need to select both Zigbee or Thread. We’ve accomplished in depth testing prior to now on operating each on the identical time, and located it simply doesn’t work properly for a complete listing of causes.
Second-generation energy
Our second-generation Join line merchandise are all about being open and performant, and one addition that fulfills this promise is our inclusion of the ESP32 chip. Join ZBT-2 contains an ESP32-S3 as its USB controller, which is a bit overkill for this job, however opens up a world of potentialities.
ESP32 units are properly understood by our crew, but in addition the group. It implies that anybody can change the firmware on this chip and presumably unlock cool new talents. As an illustration, our not too long ago launched Join ZWA-2 makes use of this identical chip to help experimental firmware that provides new performance. This isn’t to say we’ll do the very same factor with Join ZBT-2; it’s extra to say the sky’s the restrict with our second-gen merchandise. The firmware it ships with is simply the beginning, and we’ve got some cool concepts cooking on what we will do subsequent.
Open design

Take a look at all these uncovered pins and pads 🤤
Once we say open, we imply it. Within the bodily sense, it’s simple to open Join ZBT-2 as there are not any clips or glue, just a few pretty customary Phillips head screws. The board has a stunning silkscreen, which explains all of the chips, uncovered pins, and pads.
The bootloader is unlocked, and all of the firmware we construct is open supply and out there to change. We’ve additionally constructed a brand new web site
Why USB?
Earlier than you get within the feedback asking about Energy-over-Ethernet (PoE)… we completely agree it’s cool, however on this event, it’s not the path we took. Sure, PoE has grow to be simpler to make use of and its efficiency, if carried out accurately, will be fairly good (our testing with Join ZWA-2 reveals a fairly minor velocity hit). Join ZBT-2 is concentrated solely on ease-of-use and pure efficiency. That mentioned, there are plenty of PoE followers on the basis, and product gross sales assist fund growth, so who is aware of, perhaps we’ll discover a method to please everybody.
Don’t cover it
Most different USB adapters are designed to be hidden away, dangling behind a server cupboard. For one factor, antenna orientation is fairly essential, but in addition cool tech needs to be on present! We’ve designed Join ZBT-2 to be proudly displayed, and the highest even lights up like a candle – excellent timing for the vacations 🕯️.
All of it provides up

Not science, however an fascinating before-and-after of only one community, a couple of 60% enhance in direct connections 🤩
Nabu Casa
What are you ready for?
Get essentially the most out of your sensible dwelling with an adapter that’s open supply at its core, delivers most efficiency, and appears good doing it. House Assistant Join ZBT-2 is obtainable at present for buy, and as at all times, thanks for supporting House Assistant!



