Category: Beacons

Bluetooth Market Update

The Bluetooth SIG, who manage the Bluetooth specifications, have a new market update that provides information on the Bluetooth ecosystem. The most interesting and pertinent segment for our customers is location services:

Location service device shipments are expected to have 25% compound annual growth over the next five years according to ABI Research:

Commercial RTLS are being driven by recent inventory and logistic challenges:

‘Retail and Services’ at 62% is surprising as we would have expected ‘Warehouse and Logistics’ to be the larger segment.

Read about BeaconRTLS™

CoreHW AoA Hardware

CoreHW in Finland is a new entrant in the Bluetooth direction finding ecosystem. Their main product is the CHW10x0 chip that supports switching of complex antenna arrays needed for Bluetooth direction finding. It allows designs with only one component where three to five are usually required. The switch has a fast settling time for RF signals and a good phase balance between antenna ports providing better position accuracy.

CoreHW also has reference antenna arrays and 2D software for angle and position estimation to shorten time-to-market for AoA locator and AoD beacon manufacturers. They have a demo kit including 4 locators, 2 tags, a CorePatch antenna array board with CHW1010 chip, a Bluetooth T5.1 chip for IQ sampling and a USB interface (Ethernet) to connect locators with a Windows PC.

The CoreHW reference boards have some intriguing Medusa-type printed circuit board (PCB) tracks, presumably to keep the track length the same to each antenna to normalise RF signal delays.

We look forward to seeing CoreHW components in their customers’ production devices.

Minew MWL01 AoA Beacon Insights

The MWL01 Beacon is an AoA beacon which means it advertises a constant tone extension (CTS) for angle of arrival detection. An accelerometer detects the degree of movement and adjusts the advertising across three levels between 100ms (fast) -> 250ms (normal) -> 4s (slow) to save battery life. The battery level is provided in the advertising data. Double clicking the button changes the advertising, for example, for SOS notification.

Here are some observations that aren’t immediately obvious in the documentation:

  • While AoA is Bluetooth 5.x, It actually advertises Bluetooth 4.1 rather than 5.x. This makes it suitable for non-AoA applications where it can be detected by non AoA Bluetooth 4.1 receivers. It’s particularly suited for asset tracking because it increases the period between advertising, when not moving, to significantly save battery.
  • You might think the change to 4s advertising isn’t working. Be patient. It takes 5 minutes of normal advertising before it switches to slow advertising. Note that it also takes 5 seconds to go from fast advertising to normal advertising. While the advertising rates can be changed, the times to transition can’t be changed.
  • The beacon that is supplied with the AoA kit is different to that supplied separately. The kit’s MWL01 is fixed to 100ms advertising and can’t be changed. This is because it much easier to evaluate AoA and develop software when the advertising is consistent over time. The kit MWL01 can be upgraded, if necessary, to support the changing advertising period. However, we recommend you keep them as 100ms advertising beacons for ease of testing.
  • The ‘Location Finding’ flag in the AoA advertising is actually an indication of the double button press rather than anything to do with direction finding. This flag stays on for a minute and the blue led flashes during this time. Again, the double button press is only available on the non-kit beacon.
  • The battery level isn’t in the AoA data advertising. The beacon advertises a second connectable broadcast frame that includes the MAC address and battery level every 1s, 1s and 4s in the fast, normal, and slow modes respectively. These times can’t be changed.
  • Unfortunately, Minew are stipulating that the settings and firmware upgrade are only available to people who have signed an NDA with Minew or BeaconZone if you purchased the beacons from us.

Beacon Battery Use Testing

One of the issues with using Bluetooth beacons is that it’s not easy to predict how long batteries are going to last. Battery life depends not just on the battery capacity but also the transmitted power, advertising interval, beacon processor chip type and whether the beacon has timed transmission. Also, beacons vary from model to model, sometimes even between revisions of the same model. In some scenarios it’s essential to know which beacon models are the most power efficient and how long batteries will last.

Over the years we have spent a considerable amount of time investigating actual battery use. It’s not as simple as you might think. You can’t use an ammeter because it can’t see the short pulses in peak power. The majority of the power is expended in very short, few millisecond (ms) transmit pulses, in between which the beacon goes into low power sleep.

nordicadvertising

Nordic Bluetooth Advertising Power Use

Testing needs to integrate the current used over multiple advertising periods. The test equipment needs to capture this data at sub 1ms precision in order to catch the pulses. The testing also needs to be flexible enough to work for advertising periods from 100ms to 10 sec.

We have custom in-house designed test equipment capable of real-time battery current testing. This enables us to compare different manufacturers’ beacons having the same configured settings and provide our consultancy clients with beacon battery use data based on their exact configuration settings.

beaconpoweranalyser

As an example, an interesting test we did was was to compare the Sensoro AA transmitting just iBeacon vs iBeacon at the same time as the 3x Eddystone advertising packets. With only ibeacon @ 760ms, 0dBm advertising, 4 typical alkaline batteries would last 7.7 years. Transmitting all 4 iBeacon and Eddystone frames reduces the battery life to 2.9 years.

Another interesting observation has been that the beacons that have the strongest signals aren’t necessarily the ones using the most battery power. Design of aspects, such as the antenna, contribute to power efficiency.

We also offer ad-hoc beacon battery use testing.

What’s the Best iBeacon?

We often get asked what’s the best iBeacon? Unfortunately, there is no one best beacon for all scenarios. It depends on your particular project and business requirements. Having said this we have some favourites based on specific characteristics:

Best for Price: FSC-BP103 – Inexpensive beacon that transmits up to 10 channels simultaneously:

Best for Features: M52-SA Plus – Large easy replaceable battery, long range, temperature, humidity, accelerometer:

iBeacon

Best for Battery Life: SmartBeacon-AA Pro (no longer available) – Allows use of 4x AA batteries. Use lithium AA batteries for 7+ year battery life (also depends on settings).

Best for Setup App: Minew range – Minew’s latest BeaconPlus range (those supporting both iBeacon and Eddystone) provides the best in class app.

View our complete range.

IoT Projects with Bluetooth Low Energy

Our article on Beacon Proximity and Sensing for the Internet of Things (IoT) provides short summary how to use Bluetooth for IoT.

If you need a more rigorous description take a look at the book IoT Projects with Bluetooth Low Energy. It covers the fundamental aspects of Bluetooth Low Energy scanning, services, and characteristics. It goes on to describe examples of how to monitor health data, perform indoor navigation and use the Raspberry Pi for Bluetooth solutions. The book’s code is also available on GitHub.

View Sensor Beacons

Mr Beacon Podcast with Minew

There’s a new Mr Beacon podcast with Eason Huang of Minew. It describes how Minew focus mainly on hardware rather than full solutions and how they provide re-branded hardware for many platforms and beacon providers. Steve Statler (Mr Beacon) provides the insight that many of those platforms don’t really want to sell hardware and they are often focussing on software their customers might not necessarily want.

The conversation turns to the growth and challenges of IoT. The main challenges are lack of clarity of return on investiment (ROI), proof of concepts (POC) taking too long and end results not being scalable. Eason identifies that better preparation is required before starting. Steve suggests projects should initially bring in consultants to provide expert and neutral advice.

The podcast resonates with what we do at Beaconzone. We set up Beaconzone because we identified the reliance on subscription-based cloud platforms and beacons locked to platforms was limiting the available information, products and solutions. We set up BeaconZone in 2015 to provide for standalone solutions, using original manufacture beacons, not locked to subscriptions. We use and stock Minew and tens of other manufacturers’ beacons and gateways.

The issues of IoT projects also resonates with what we have seen through providing consultancy. Too many people come to us, too late, with projects that shouldn’t have been started because they had obvious technical limitations or have been developed in a direction that makes them technically or financially non-viable. A small amount of expert advice, early on, can make a huge difference and reduce risk.

Even when organisations know they should seek initial help and contact us, we sometimes find they are reticent about investing what is a relatively small amount of money compared to a failed POC cost. The reason is that these organisations have no experience of using Bluetooth for IoT so don’t know the unknown unknowns. Everything looks feasible until they are deep into the POC. It’s for these situations that we also offer quick, low priced Micro Consultancy.

How to Set Up the FSC-BP103

Feasycom have a new video showing how to set up the FSC-BP103:

The FSC-BP103 is popular for use on a key ring or lanyard due to its small size (37.8mm x 33.8mm x 7.9 mm).

It’s also relatively inexpensive allowing it to be rolled out to a large number of people. For example, we have London Queen Mary University Barts Cancer Institute using this beacon with BeaconRTLS to audit room occupancy for Covid. The button is also used as an SOS in the case of lone working.

View Wearable Beacons

Semiconductor Price Increases

Many of our suppliers have notified us the current global shortage of chips is starting to hit the Beacon ecosystem. While there isn’t currently a shortage of beacons, semiconductor prices are causing Bluetooth beacon prices to increase.

Factories are having to plan the purchase of components 6-12 months ahead rather than buy just in time. If components don’t arrive in time, they have to be purchased last minute on the more expensive spot market.

Stocks we already have in the UK won’t increase in price until we re-stock. We are experiencing special and custom orders being higher in price and/or having longer lead times, depending on the manufacturer. This is a short term problem for 2021 and 2022. Some in the industry predict it could be two years before new manufacturing facilities can ease supply concerns.

Bloomberg has a great in-depth article The Chip Shortage Keeps Getting Worse. Why Can’t We Just Make More? if you wish to learn more.