Biosignalsplux SENSPRO-ACC Manuel utilisateur

biosignal acquisition tool-kit for advanced research applications

Accelerometer (ACC) Sensor User Manual

Accelerometer (ACC)

User Manual

PLUX –Wireless Biosignals, S.A.

Av. 5 de Outubro, n. 70 –2.

1050-059 Lisbon, Portugal

[email protected]

http://biosignalsplux.com/

This information is provided "as is," and we make no express or implied warranties whatsoever with respect to functionality, operability, use, fitness for a

particular purpose, or infringement of rights. We expressly disclaim any liability whatsoever for any direct, indirect, consequential, incidental or special

damages, including, without limitation, lost revenues, lost profits, losses resulting from business interruption or loss of data, regardless of the form of action or

legal theory under which the liability may be asserted, even if advised of the possibility of such damages.

ATTENTION

Please read this datasheet before

using your biosignalsplux sensor

The information contained in this document has been carefully checked and were made every effort

to ensure its quality. PLUX reserves the right to make changes and improvements to this manual and

products referenced at any time without notice.

The word Bluetooth and its logo are trademarks of Bluetooth SIG Inc. and any use of such marks is

under license. Other trademarks are the property of their respective owners.

Please check your systems and sensors after receiving and before using it the first time to confirm if it

contains all the ordered sensors, accessories and other components. Contact our support via e-mail at

[email protected] if there are any variations from your original order.

For regulatory information, please see the Regulatory Disclaimer at the end of this document.

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TABLE OF CONTENTS

1. General Information............................................................................................................. 4

1.1. General Description ........................................................................................................... 4

1.2. Typical Unfiltered Sensor Output........................................................................................ 4

1.3. Sensor Specifications ......................................................................................................... 5

1.4. Features ............................................................................................................................ 5

1.5. Applications....................................................................................................................... 5

1.6. Transfer Function (Conversion Formula)............................................................................. 5

1.7. Physical Characteristics...................................................................................................... 6

2. Application Notes..................................................................................................................... 7

3. Using the Accelerometer (ACC) Sensor with biosignalsplux & OpenSignals ................................. 8

3.1. Connecting the sensor to biosignalsplux Systems................................................................ 8

3.1.1. biosignalsplux 4-Channel Hubs............................................................................................. 8

3.1.2. biosignalsplux 8-Channel Hubs............................................................................................. 8

3.2. Configuring the Sensor in OpenSignals................................................................................ 9

3.2.1. OpenSignals (r)evolution (Windows, macOS, Linux) ............................................................ 9

4. Scientific Publications Using the SENS Sensor .......................................................................... 11

5. Safety & Maintenance ............................................................................................................ 12

5.1. Safety Instructions........................................................................................................... 12

5.2. Transportation and Storage.............................................................................................. 13

5.3. Cleaning .......................................................................................................................... 13

6. Ordering Guides, Regulatory & Legal Information.................................................................... 14

6.1. Ordering Guide................................................................................................................ 14

6.2. Guarantee of Quality & Warranty..................................................................................... 14

6.3. Warranty Voidance.......................................................................................................... 14

6.4. Contact & Support ........................................................................................................... 14

6.5. Regulatory Disclaimer...................................................................................................... 14

6.6. Document Version Tracking ..................................................... Error! Bookmark not defined.

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1. General Information

1.1. General Description

The biosignalsplux tri-axial Accelerometer (ACC) uses Micro-Electro-Mechanical Systems (MEMS®)

technology for the acquisition of high-quality accelerometery data. This sensor can measure sub-milliG

accelerations and provides raw data of each axis on individual channels, giving you full control about

the acquired data.

ACC sensors are commonly found in motion tracking applications where this sensor can be used for

the development of to measure physical activity, range of motion, as well as to conduct vibration

analysis, which, for example, can be used to prevent ergonomic injuries or evaluate tremors of

Parkinson patients.

Figure 1: biosignalsplux ACC sensor (standard version)

1.2. Typical Unfiltered Sensor Output

Figure 2 shows a typical unfiltered Accelerometer sensor output acquired while doing an 8 like

movement in order to stimulate all axis. The raw digital sensor values received from the biosignalsplux

device ranged between 0 and 2n-1 (n=sampling resolution) can be converted into the original unit of

measurement of this sensor (g) using the transfer function found in section Transfer Function

(Conversion Formula).

Figure 2: Typical unfiltered sensor output (doing an 8 like movement in order to stimulate all axis).

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1.3. Sensor Specifications

> Axis:

> Range:

±3.60 g

> Bandwidth:

0-50 Hz

> Consumption:

~0.35 mA

1.4. Features

>Tri-axial sensing

> Unobtrusive & lightweight sensor

>MEMS technology

> Pre-conditioned analog output

>High signal-to-noise ratio

> Ready-to-use and miniaturized form factor

> Medical-grade raw data output

> Raw data output

1.5. Applications

> Life sciences studies

> Biomedical device prototyping

> Activity monitoring

> Tilt detection

> Vibration measurement

> Human-Computer interaction

> Robotics & Cybernetics

> Biomechanics

1.6. Transfer Function (Conversion Formula)

The analog sensor signals acquired with biosignalsplux devices are converted into digital values ranged

between 0 and 2n-1 (n=sampling resolution, usually 8-bit or 16-bit) and streamed in the raw digital

format.

In most applications, the original physical unit of the acquired ACC signal is preferred or required. The

raw digital sensor samples can be converted back into relative gravitational acceleration/g-force (g)

using the following formula:

𝐴𝐶𝐶(𝑔)=𝐴𝐷𝐶 − 𝐶𝑚𝑖𝑛

𝐶𝑚𝑎𝑥 − 𝐶𝑚𝑖𝑛

× 2 − 1

(1)

Valid sensor range: [-3.60 g, 3.60 g]

with: 𝐴𝐶𝐶(𝑔)ACC value in g-force (g)

𝐴𝐷𝐶 Value samples from the sensor/channel (digital value)

𝐶𝑚𝑖𝑛 Minimum calibration value

𝐶𝑚𝑎𝑥 Maximum calibration value

For more information about 𝐶𝑚𝑖𝑛 and 𝐶𝑚𝑎𝑥, please, check the content of section 2. Application Notes.

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1.7. Physical Characteristics

> W1 x L1 x H1:

1.6cm x 2.2cm x 0.5cm

> W2:

1.0±0.1cm

> W3:

1.0±0.1cm

> W4:

0.5±0.1cm

> L2:

1.3±0.1cm

> L3:

0.7±0.1cm

> A1:

105.0±0.5cm

> A2:

8.5±0.5cm

> H2:

0.7±0.1cm

> S:

0.3±0.1cm

>Available sleeve colors:

White, Black, Blue, Green, Red, Yellow, Grey, and Brown

Figure 3: Physical characteristics of the standard ACC sensor.

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2. Application Notes

This sensor requires a calibration to provide reliable measurements. The resulting calibration values

(𝐶𝑚𝑖𝑛& 𝐶𝑚𝑎𝑥) which are needed for the transfer function below are determined by performing a very

slow 360° rotation of the sensor around each axis to force the accelerometer to cross the gravity-

imposed −1g and 1g.

𝐶𝑚𝑖𝑛& 𝐶𝑚𝑎𝑥 define the minimum and maximum RAW data values, respectively, registered in the axis

under analysis during the calibration protocol.

Axes/Channel Configuration

Figure 4: Relationship between each input cable and the respective axis under monitorization.

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3. Using the Accelerometer (ACC) Sensor with biosignalsplux &

OpenSignals

3.1. Connecting the sensor to biosignalsplux Systems

3.1.1. biosignalsplux 4-Channel Hubs

The biosignalsplux ACC sensor is compatible with all 4 analog input channels of the 4-channel

biosignalsplux hub, but incompatible with the reference/ground port. Connect the sensor to an analog

input to use it with this device.

Figure 5: ACC compatible biosignalsplux channels (green checkmarks).

3.1.2. biosignalsplux 8-Channel Hubs

The biosignalsplux ACC sensor is compatible with all 8 analog input channels of the 8-channel

biosignalsplux hub, but incompatible with the reference/ground and digital I/O ports. Connect the

sensor to an analog input to use it with this device.

Figure 6: ACC compatible biosignalsplux channels (green checkmarks).

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3.2. Configuring the Sensor in OpenSignals

3.2.1. OpenSignals (r)evolution (Windows, macOS, Linux)

Note

Download OpenSignals (r)evolution here: https://biosignalsplux.com/index.php/software

Open the OpenSignals (r)evolution device manager to access and configure your biosignalsplux

device.

Figure 7: Access the OpenSignals (r)evolution device manager.

Select the device you intend to use for acquisition by clicking on ENABLE button on the device panel in

the OpenSignals device manager. The device is activated for acquisition if the ENABLE button is blue.

Figure 8: Enabling the device for acquisition.

Click on the biosignalsplux logo to access the available settings. Select the channels your sensor is

connected to and select the XYZ from the dropdown menu highlighted in the next screenshot.

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Figure 9: Set the channel type of the channels you have your ACC sensor connected to, to XYZ.

Activate the channel for acquisition by clicking on the circle next to the channel type (must be blue). If

not done before, follow the instruction available in section 3.1 Connecting the sensor to biosignalsplux

Systems to learn how to connect your device to your biosignalsplux device. Click on the record button

in the OpenSignals main interface whenever you’re ready for your acquisition.

Figure 10: Start the acquisition whenever you’re ready.

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