muscleBAN BLE
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muscleBAN BLE Datasheet

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muscleBAN BLE
Designed & Made in Portugal

Table of Contents
General Information .............................................................................................. 4Specifications ...............................................................................................................4
Features ........................................................................................................................4
Applications ..................................................................................................................5
Electrical Specifications ................................................................................................5Application Notes .................................................................................................. 6
Turning the Device On & Off ...........................................................................................6
Electrode Setup.............................................................................................................7Motion Sensor Axes & Orientation ..................................................................................8LED Color Codes ...........................................................................................................9System LED States ........................................................................................................9Battery LED States ....................................................................................................... 10

Transfer Functions ............................................................................................... 10
Electrocardiography (EMG) Sensor ............................................................................... 10Accelerometer ............................................................................................................ 10Gyroscope................................................................................................................... 10Sample Signals .................................................................................................... 12
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Normal EMG ................................................................................................................ 12Accelerometer ............................................................................................................ 12Gyroscope................................................................................................................... 13Disclaimer ........................................................................................................... 14
For a getting started guide, visit the following article:
https://support.pluxbiosignals.com/knowledge-base/muscleBAN-ble-getting-started/
For support visit
www.support.pluxbiosignals.com

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MUSCLEBAN BLE (2024)

General Information
Introducing muscleBAN BLE, your go-to wireless wearable for hassle-free EMG and motion data collection.
Designed with your comfort in mind, it's the solution for seamless research in any setting. Say goodbye to bulky,
uncomfortable devices – muscleBAN is designed to ensure user comfort, even during dynamic activities. Plus,
it's ready to use as a medical device OEM. Talk to our team for more info.

Specifications> On-Board Sensors:> Sensor Ranges> Communication:> Communication Range:> Internal Memory:> Battery:> Battery Lifetime:> Charging Port:> Size:> Weight:

1x Single-Lead EMG
1x Triaxial Accelerometer
1x Triaxial Gyroscope
EMG: ±2.5mV
Accelerometer: ±8g
Gyroscope: ±500dps
Bluetooth Low Energy (BLE) (v.5.3)
Up to 10m (in line of sight)
Up to 10h
Rechargeable 155mA 3.7V LiPo
Up to 10h in continuous streaming
Micro-USB compatible with an standard USB Charger
31x71x11mm27g

Features> Wearable for single-channel EMG & motion data acquisition> EMG measurements with virtual ground (the reference point is internally created)> Raw signal acquired at 1000Hz> Miniaturized and bendable form factor for better adaption to the body shape

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Applications
This product is designed for life science education and research. It is not a medical device and is not suitable forany kind of medical use.
> Life sciences studies> Biomedical studies> Human-Computer Interaction> Robotics & Cybernetics> Physiology studies> Psychophysiology> Biomechanics> Ergonomics

Electrical Specifications

Number of channels
Resolution
Input full-scale
Analog bandwidth
Sample rate

EMG
116 bit+/- 2.5mV[0.05Hz to 150Hz]
1000HzACC
3
16 bit+/-8G[dc to 415Hz]
1000HzGYR
316 bit+/-500dps[dc to 315Hz]
1000HzLast Document Update: Tuesday, May 21, 2024
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Application Notes
A detailed Getting Started guide covering everything needed around the muscleBAN is available on our support
page:
https://support.pluxbiosignals.com/knowledge-base/muscleBAN-ble-getting-started/

Turning the Device On & Off

Figure 1: muscleBAN On (left) & Off (right) switch

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Electrode Setup
muscleBAN EMG signals are measured using a bipolar setup, which means that two measuring electrodes witha positive (IN+) and a negative (IN-) lead are placed on the muscle of interest to measure the voltage imbalances.
The negative electrode collection is located on the backside of the device part that contains the Status LED. The
positive electrode is located on the backside of the device, which contains the muscleBAN logo and the Battery
LED.
The polarity of the electrodes is interchangeable in muscleBAN EMG sensors, i.e., you can place the muscleBANin both ways to measure EMG data correctly. The position of the electrodes is the key element to pay attention
to.
Generally, the straightforward approach to find the best positioning is to place the muscleBAN along the centerof the muscle with the electrodes being placed along the muscle fibres. As shown in the folllowing illustration
using the Biceps muscle as an example:Figure 2: muscleBAN example placement.

We recommend reviewing also the following articles for additional instructions on skin preparation and further
example placements for EMG recordings:•

https://support.pluxbiosignals.com/knowledge-base/electrode-skin-preparation-tutorial/•

https://support.pluxbiosignals.com/knowledge-base/where-should-i-place-my-electromyographyemg-electrodes/

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Motion Sensor Axes & Orientation
muscleBAN comes with built-in triaxial Accelerometer and Gyroscope for motion sensing. The default axis layout
for the triaxial motion of the Acceleroemter is set as follows:

Figure 3: muscleBAN motion sensor axes.

Depending on the orientation of your sensor, the axis can change. It’s recommended to test the orientation ofyour muscleBAN with your sensor data to identify the matching signals. In an Accelerometer, the mostprominent axis to identify is the vertical Z-axis, which is naturally offset by approximately 1G because the Earth’s
gravitational force accelerates along this axis.

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LED Color Codes

Figure 4: muscleBAN's feedback LEDs

System LED States
StateOFFIDLE

START_ ACQUIRING

Description
The device is switched off
The device is turned on and waiting
for some interaction.
The device is turned on and waiting
for some interaction, but it has aschedule loaded in memory to startan acquisition.
The device is turned on and waiting
for some interaction, but a BLE
Bluetooth connection has been
established with a host machine.
The device is turned on and waiting
for some interaction.
It has a schedule loaded in memory tostart an acquisition.
A BLE Bluetooth connection has
been established with a hostmachine.
The device has started an acquisition.

ACQUIRINGERROR

The device is in aquation mode.
The device is in an error state.

IDLE + SCHEDULEDIDLE + CONNECTEDIDLE+
SCHEDULEDCONNECTED+LED effect
Off, no lighting effect
Blinking yellow at 0.5Hz
Alternates between yellow and blue
at 0.5Hz

Blinking green at 0.5Hz

Alternates between green and blue at0.5Hz

Fast blinking blue at 5Hz during 1
secondBlinking blue at 0.5Hz
Blinking red at 2Hz

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Battery LED States
StateNORMAL/CHARGED

CHARGING
LOW_BATTDISCHARGED_BATT

Description
The LED being off occurs in twosituations:(a) Device has an appropriate charge
level for its operation.
(b) Device is fully charged.
Device is charging
The device's battery level is getting
low; it is recommended to put thedevice on charge.
The device's battery level is criticallylow. The device must be charged
immediately.

LED effect
Off, no lighting effectSolid red, always on
Blinking red at 1Hz

Blinking red at 10Hz

Transfer Functions
Electrocardiography (EMG) Sensor
The EMG input voltage range = [-2.5𝑚𝑉, 2.5𝑚𝑉]

𝑉𝐸𝑀𝐺 [𝑉] =𝑉𝑅𝐸𝐹 (𝐴𝐷𝐶 − 2𝑛−1 )2𝑛 × 𝐺𝑎𝑖𝑛

𝑉𝐸𝑀𝐺 [𝑚𝑉] = 𝑉𝐸𝐶𝐺 [𝑉] ∗ 1000
Where:
𝑉𝑅𝐸𝐹 - ADC voltage reference, 2.5[V]𝐺𝑎𝑖𝑛 - Analogue voltage gain, 500
𝑉𝐸𝑀𝐺 [𝑉] – Raw EMG value in Volt [𝑉]𝑉𝐸𝑀𝐺 [𝑚𝑉] – Raw EMG value in millivolt [𝑚𝑉]
𝐴𝐷𝐶 – Value sampled from the channel𝑛 - ADC number of bits, 16 bit

Accelerometer
Range: [-8𝐺, 8𝐺]
𝐴𝑐𝑐(𝑔) = (𝐴𝐷𝐶 −2𝑛16) . ( 𝑛)22𝐴𝑐𝑐(𝑔) – Accelerometer value in g
𝐴𝐷𝐶 – Value sampled from the channel
𝑛 – Number of bits of the channel 1

Gyroscope
Range: [-500dps, 500dps]
1 The number of bits for each channel depends on the resolution of the Analog-to-Digital Converter (ADC); inmuscleBAN the default is 16-bit resolution (n=16)
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muscleBAN BLE Datasheet
𝐺𝑦𝑟(𝑑𝑝𝑠) = (𝐴𝐷𝐶 −www.pluxbiosignals.com2𝑛1000).( 𝑛 )22𝐺𝑦𝑟(𝑑𝑝𝑠) – Accelerometer value in degrees per second (dps)
𝐴𝐷𝐶 – Value sampled from the channel
𝑛 – Number of bits of the channel1

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Sample Signals
The following signals show typical using a muscleBAN sensor data.

Normal EMG

Observation:
Muscle activations are visible as burst of signal amplitudes with flat, low-noise baseline between the individualbursts.

Accelerometer
The Accelerometer measures acceleration along the three axes (x, y, z). The amplitude of the signal correlateswith the acceleration that occurs along each axis.
In the following signal, this ampltiude change is visualized in the following intervals:••••

0s to 10s: No acceleration / movement
10s to 20s: Moderate acceleration / movement
20s to 30s: Intensive acceleration / movement
30s to 40s: No acceleration / movement

Figure 5: Motion data of different intensities in muscleBAN Accelerometer data.

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For further information about the orientation of the Accelerometer axis, see the section Motion Sensor Axes &Orientation.

Gyroscope
The Gyroscope measures angular velocity, which is the rate at which an the muscleBAN rotates around the axes
(x, y, z). The amplitude of the signal correlates with the acceleration that occurs around each axis.
The following signals show the results of the Gyroscope when conducting the same motion pattern of theprevious Accelerometer sample signal.

Figure 6: Figure 7: Motion data of different angular velocities in muscleBAN Gyroscope data.

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Disclaimer
PLUX products, including muscleBAN BLE products, are intended for use in life science education and research
applications; they are not medical devices nor are they intended for medical diagnosis, cure, mitigation,
treatment or prevention of disease.
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 orloss 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.

Last Document Update: Tuesday, May 21, 2024
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