Bluetooth Sensor Tags

Bluetooth sensor tags and sensor beacons are essentially the same thing. The terminology of tags vs beacons stems from how they are used. If the devices are fixed, they tend to be called beacons and if they are placed on assets or people they tend to be called tags because they are tagging things and people. However, the terminology is interchangeable, irrespective of the use.

The use of the term tags also comes from the use in RFID, barcode and UWB devices that can also be used to uniquely identify devices.

Bluetooth sensors can be used in two ways, either via connection-less advertising or having another  Bluetooth device connect and examine values. This is explained further in our article on Using Bluetooth Wireless Sensors.

Tagging implies locating. However unlike other technologies, devices can do a lot more than just locating and can detect movement (accelerometer), temperature, humidity, air pressure, light and magnetism (hall effect), proximity, heart rate and fall detection.

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Using Beacons, iBeacons for Real-time Locating Systems (RTLS)

Beacon Proximity and Sensing for the Internet of Things (IoT)

What New Things Could Machine Learning Enable?

Benedict Evans of Andreessen Horowitz, a venture capital firm in Silicon Valley, has a thought-provoking blog post on Ways to Think About Machine Learning.

Benedict asks what new things machine learning (ML) could enable. What important problems might it actually be able to solve? There are (too) many examples of machine learning being used to analyse images, audio and text, usually using the same example data. However, the main question for organisations is how can they use ML? What should they look for in data? What can be done?

Much of the emphasis is currently on making use of existing captured data. However, such data is often trapped in siloed company departments and usually needs copious amounts of pre-processing to make it suitable for machine learning.

We believe some easier-to-exploit and more profound opportunities exist if you use new data from sensors attached to physical things to create new data. Data from physical things can provide deeper insights than existing company administrative data. The data can also be captured in more suitable formats and can be shared rather than stored by protectionist company departments.

For example, let’s take movement xyz that’s just one aspect of movement that can be detected by beacons. Machine learning allows use of accelerometer xyz motor vibration to predict the motor is about to fail. Human posture, recorded as xyz allows detection that patients are overly-wobbly and might be due for a fall. The same human posture information can be used to classify sports moves and fine tune player movement. xyz from a vehicle can be used to classify how well a person is driving and hence allow insurers provide behavioural based insurance. xyz from human movement might even allow that movement to uniquely identify a person and be used as a form of identification. The possibilities and opportunities are extensive.

As previously mentioned, the above examples are just one aspect of movement. If you also consider movement between zones, movement from stationary and fall detection itself, more usecases become evident. Sensor beacons also allow measuring of temperature, humidity, air pressure, light and magnetism (hall effect), proximity and heart rate. There are so many possibilities it can seem difficult to know where to start.

One solution is to look at your business rather than technical solutions or even machine learning. Don’t expect or look for a ready-made solution or product as the most appropriate machine learning solutions will usually need be custom and proprietary to your company. Start by looking for aspects of your business that are currently very costly or very risky. How might more ‘intelligence’ be used to cut these costs or reduce these risks?

Practical examples are How might we use less fuel? How might we use less people? How might we concentrate on the types of work that are least risky? How might be preempt costly or risky situations? How might we predict stoppages or over-runs?

Next, use your organisation domain experts to assess what data might be needed to measure data associated with these situations. Humans often have insight that patterns in particular data types will help classify and predict situations. They just can work out the patterns. That’s where machine learning excels.

Read About AI Machine Learning with Beacons

Detecting Temperature With Beacons

Some sensor beacons can be used to monitor temperature. The first thing to consider when comparing temperature beacons is whether they have a dedicated hardware temperature sensor. Some beacons have a temperature sensor inside the main chip (System on a Chip – SoC) that’s less accurate and has less precision. The sensor is mainly there to give an indication of the chip temperature, not the ambient (outside the beacon) temperature. Most beacons only transmit for the order of 1ms every 10 to 5 seconds and enter a very low power state the remainder of the time. This means they not only use low power but don’t significantly heat the SoC. This means the SoC roughly tracks the outside temperature.

In our sensor beacon listings, when we say a beacon has a temperature sensing it has a separate hardware sensor, usually the Sensirion SHT20, providing more accuracy and precision than the sensor in a SoC. Some of our beacons, such as the Minew i3 and i7 have an internal SoC temperature sensor that’s readable but we don’t classify that as a sensor beacon.

The next thing to consider is the casing. In order to quickly track ambient temperature, the casing needs to be open somewhere and usually have a hole. Beacons that say they are waterproof and have temperature sensing won’t track ambient temperature well.

We have had customers use temperature sensing beacons in scientific situations and where they need to periodically calibrate sensing equipment. How do you calibrate temperature sensor beacons? The SHT20 is has a long term drift of only <0.04 deg C/year (the humidity reading vaies difts by <0.5%RH/year) so it doesn’t need calibration for most situations. However, if you need better than this, or check calibration, you will need to periodically calibrate in the software of the device (usually an app) that receives the beacon sensor data.

Detecting Movement With Beacons

There are various types of movement that can be detected by beacons:

Movement between zones – This is large scale movement between, for example, rooms. This relies on devices detecting the beacons and relaying the information to software that, stores historical location, plots positions and creates alerts. This is the basis for Real Time Locating Systems (RTLS).

Movement from stationary – This is when something goes from being stationary to moving. There are two ways to do this. You can look at the xyz from a beacon accelerometer to determine it has started moving. Alternatively, some beacons such as the iB003 have motion triggered advertising so you will only see the beacon when it moves.

Falling – Again you can look at the xyz from a beacon accelerometer to determine a beacon is falling. Alternatively, you can use a more intelligent beacon such as the iBS01G that does this for you and just gives indications of a start/during/end of a fall as values in the advertising data.

Vibration – The xyz can be used to determine the degree of the movement and hence vibration.

Posture detection – This is more advanced analysis of the xyz that works out, for example, if someone is walking, running, sitting or standing. Another use is the analysis of sports (e.g. golf, squash, tennis, badminton) swings to determine the type of movement and score the movement.

There also scenarios outside the above that are also possible. For example, we had a customer wanting to know if their forklift truck hadn’t been moving for 2 minutes so as to make best use of it.

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Prognostics, Predictive Maintainance Using Sensor Beacons

A growing use of sensor beacons is in prognostics. Prognostics replaces human inspection with continuously automated monitoring. This cuts costs and potentially detects when things are about to fail rather than when they have failed. This makes processes proactive rather than reactive thus providing for smoother process planning and reducing the knock-on affects of failures. It can also reduce the need for over excessive and costly component replacement that’s sometimes used to reduce in-process failure.

Prognostics is implemented by examining the time series data from sensors, such as those monitoring temperature or vibration, in order to detect anomalies and make forecasts on the remaining useful life of components. The problems with analysing such data values are that they are usually complex and noisy.

Machine learning’s capacity to analyse very large amounts of high dimensional data can take prognostics to a new level. In some circumstances, adding in additional data such as audio and image data can enhance the capabilities and provide for continuously self-learning systems.

A downside of using machine learning is that it requires lots of data. This usually requires a gateway, smartphone, tablet or IoT Edge device to collect initial data. Once the data has been obtained, it need to be categorised, filtered and converted into a form suitable for machine learning. The machine learning results in a ‘model’ that can be used in production systems to provide for classification and prediction.

IoT Sensing Without Soldering

There are a lot of ways of doing sensing that mostly include development boards, wires and soldering. Even if you use prototyping or breadboards, your final solution is rarely ready for real use or production without then creating a custom electronics solution.

Sensor beacons provide for IoT sensing where all of the developed solution can be in software. The beacons send data via Bluetooth preventing the need for wires and soldering, even in production solutions. All you need is the receiving software in an app, laptop, desktop or other computer where you can receive data and if necessary send it on to servers.

What’s more, the use of low power Bluetooth allows you to place the sensors in locations where there’s no mains power. Batteries in the beacons can last 5 years or more depending on the sensor sampling frequency.

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Beacon Proximity and Sensing for the Internet of Things (IoT)

Machine Learning Sensor Data

Mobile World Live, the media arm of the GSMA, has a new article titled IoT data impossible to use without AI.

The article title is over-dramatic because IoT data can be used without AI. However, as the article goes on to say, AI is …

‘vital to unlocking the “true potential” of IoT’

… that has more truth.

As usual, these things are said with no example or context. Let’s look at a simple example.

Let’s say we want to use x y z accelerometer data from one of our sensor beacons to measure a person’s movement. If we wanted to know if the person is falling we could test for limits on the x y z. This doesn’t use AI. Now consider if we want to know if person is walking, standing, running, lying down (their ‘posture’). You can look at the data forever looking for right patterns of data. Even if you found a pattern, it probably wouldn’t work with a different person. AI machine learning provides a solution. A simplistic explanation is that it can take recordings of x y z of these postures from multiple people and create a model. This model can then be used with new data to classify the posture.

AI solves problems that previously seemed too complex and impossible to solve by humans. Solving such problems often improves efficiency, saves costs, increases competitiveness and can even create new intellectual property for your organisation.

However, don’t automatically turn to AI to make sense of sensor data. Don’t over-complicate things if the data can be analysed using conventional programming.

Machine Learning with Beacons

Advanced BlueUp BlueBeacon Sensor in Stock

We now stock the BlueUp BlueBeacon Sensor. This is one of the most capable sensor beacons we know of with up to 8 advertising slots. It detects temperature, humidity and air pressure. It also supports Quuppa and Eddystone GATT Service.

The two AA batteries (included) last 3.5 years with default settings.

Beacons and The 4th Industrial Revolution

We previously wrote about how beacons are part of Industry 4.0 and how implementations need to achieve a return on investment. Industry 4.0 is also being called ‘The 4th Industrial Revolution’ (4IR).

Oracle and the EEF have an excellent free, recent, paper (registration NOT required) on The 4th Industrial Revolution: A Primer for Manufacturers. It concludes 4IR isn’t hype and should be taken seriously. Here’s how manufacturers themselves see 4IR:

Manufacturing is undergoing a transformation. The report says it’s all about data connectivity. However, the report falls short on explaining how data can be sensed and captured. Sensor beacons, gateways and beacon platforms such as our BeaconRTLS are one such solution that helps fill that gap.

Read more about beacons and the IoT