Designers considering Bluetooth Low Energy (BLE) for their next wearable, fitness design or smart home device need to
think about a ton of things today. Connections can be inconsistent and ongoing usage can burn through battery-life,
which ultimately leads to unhappy consumers.
The good news is that the Bluetooth Sig and companies that are advancing their Bluetooth solutions are fixing this.
Here are a few key improvements to consider in your next Bluetooth low energy design for connectivity and energy
efficiency for your smart home or wearable device.
Find the right balance between power and energy consumption
It’s frustrating to have your smart wearable device drain battery quickly. For the most part, there
seems to be an endless battle against weak battery life, finding charging stations or digging deep down in your
bags, scrambling for your charger because you need to stay connected. ARGH – those moments are familiar and
realized by many people.
And as the industry works toward developing a more connected environment for people and their things – the
Internet of Things continues to drive demand. Luckily it also drives development, investment and advancement.
New solutions to improve battery life of wearable devices make their way to consumers. The new QN 9080, a BLE SoC is
more like a “wearable-on-a-chip,” and is designed to provide intelligence for future wearable devices.
The solution is jam-packed with features like an ARM Cortex M4 to run various applications like interface and a
fusion signal processor for “always-on” sensing to make your device smarter. However, what the
QN 9080 really does is finds a meaningful balance between power and energy consumption, minimalizing impact of usage
on battery. With solution like the QN 9080, consumers can expect to use their wearable devices for up to a
month without recharging.
Use a proven technology when building a wireless mesh network
When you think about wireless mesh networks (or at least when I do), the first thing
that comes to mind is ZigBee. Such networks are
starting to penetrate the industrial markets, but they certainly haven’t taken the industry by storm.
There’s another entrant on the horizon, and it has some qualities that could provide some sticking power.
There are some very good reasons to use Bluetooth as the backbone to a wireless mesh network. This could include
designers’ familiarity with the technology, users’ familiarity with the technology and the lower
pricing due to the high volumes of Bluetooth components.
In an attempt to make the Bluetooth mesh technology more pervasive, the Bluetooth Special Interest Group (SIG) recently formed
the Bluetooth Smart Mesh Working Group. The charter of the working group is to build the architecture for
standardized mesh networks using Bluetooth Smart technology (Bluetooth Smart, aka Bluetooth 4.0, has some
intelligence built in to reduce power).
Applications for Bluetooth mesh networks include those found in most every consumer’s home: door locks,
lights, HVAC systems and white goods (washers, dryers, refrigerators and so on). That’s just the tip of the
iceberg. For every consumer application, there are likely a dozen industrial applications (where margins could
potentially be significantly higher).
More than 80 Bluetooth SIG member companies have volunteered to serve on the Bluetooth Smart Mesh Working Group. The
SIG claims that this is higher than for any other working group, which tells you just how high a priority this
initiative is. And the companies span a broad array of industries, including automotive, mobile phones, industrial
and home automation, consumer electronics and computing, to name a few.
According to the Bluetooth SIG’s website, the group’s objective is to build a common platform that all
members can develop to. Their goal is to have the specification ready for prototype testing later this year, and
then officially adopt profiles in 2016. Bear in mind that industry groups are notorious for not hitting their
One of the keys to having a successful mesh (and there are obviously different ways to define success) is to add
intelligence to the network. A primary reason for this addition is to reduce the power consumption. For example, the
network that’s built with NXP’s QN9020 controller puts a routing table into
each node, thereby making it a “smart node.” That routing table helps determine the best data path,
which raises efficiency, which lowers the power draw. Another feature of the QN9020 is that it can be updated on the
fly, which is key since the standard is still in flux. And it’s a simple process, as easy as updating an app
on your smartphone. The QN9020 integrates a Bluetooth Low Energy (LE) radio, a controller, a protocol stack and
profile software on one chip. Among other features, it also includes a high-performance MCU and on-chip memory.