Mentalab EXPLORE Manual de usuario

Table of Contents
Acronyms and Abbreviations 2
Definitions 2
Introduction 3
1 Intended Use 3
2 Release Notes 3
3 Product Certification 3
4 Safety 4
Technical Information 6
1 Explore Outline 6
2 Contents 6
3 Device Specifications 7
Operation Instructions 8
1 Operating Modes 8
2 First Setup 8
3 Device State Diagram 12
4 LED Codes 13
5 Button Commands 14
6 Data Structure 15
APIs 16
Device Troubleshooting 17
1

Acronyms and Abbreviations

API

Application user interface

ECG

Electrocardiogram

EEG

Electroencephalogram

EMG

Electromyography

ExG

EEG / EMG / ECG

SPS

Samples per second

Definitions

Recording session

The period in which the device is recording. For each recording session, starting

automatically at device start up, a bin file in the flash memory will be generated.

Advertising

As part of the Bluetooth connection process, the Explore device will advertise that it is

available for a connection to a host machine. When it is connected, the Explore device

becomes the slave device.

Reference Bluetooth Core Specification Version 4.0 for more information.

Host machine

The computer or smartphone that initiates the connection and is the master in the

connection with the Explore device.

Pairing

Establishing a connection between two Bluetooth devices.

Online mode

Data will be transmitted to the host machine in addition to being stored on the device

memory in duplicate. The host machine can send data and commands to the device.

Offline mode

Data will be stored only in the device memory. No host machine is connected to the

device.

1 Introduction

1.1 Intended Use

Mentalab Explore is a biosignal acquisition device developed mainly for research,

development, and educational purposes. It is not intended for medical use. Mentalab

Explore is used by scientists, developers, innovators, and students around the world in their

own custom applications.

This document serves as technical instruction manual for Mentalab Explore devices. Any

modification, publication or distribution of parts or the whole document are not permitted

1.2 Release Notes

Date

Firmware

Explorepy

Documentation

Changes

31.08.2020

2.1.4

1.1.0

MLExploreV1.1

First release

1.3 Product Certification

Mentalab hereby declares that the Explore product series is in accordance with the

requirements and relevant provisions of EU directives:

2014/30/EU

2014/53/EU

2015/863/EU

1.4 Safety

Preventing Misuse

Any operator of a Mentalab Explore device should read the instruction manual specific to the

device and API versions. The device is only to be operated according to the instructions.

Mentalab Explore is not intended for medical use, including any diagnostic or therapeutic

applications.

Mentalab Explore tolerates continuous exposure of [-2.7V, +2.7V] without electrical damage

and has a built-in ESD protection that protects against burst exposure:

• IEC 61000-4-2 Level 4 ESD Protection – ±12-kV Contact Discharge – ±15-kV Air Gap

Discharge

• IEC 61000-4-4 EFT Protection – 80 A (5/50 ns)

• IEC 61000-4-5 Surge Protection – 2.5 A (8/20 µs)

When using the Explore system with other hardware or implanted electrical cardiac or neural

stimulators (pacemaker, tDCS, tACS, DBS, etc), the above values should not be exceeded to

provide safe use. Using Explore with additional hardware can affect the accuracy of the

recorded signals.

Mentalab Explore is not protected against electrical defibrillation. The device and electrodes

must be detached from the subject’s skin beforehand.

Before use, inspect the device and accessories thoroughly for possible damage to

connectors, sockets, and cables. Especially, ensure that the electrode cables are intact. Any

part of the equipment must be replaced immediately if damaged or not working correctly.

The device and its accessories must not be exposed to increased mechanical stress.

Do not open or modify the device, it will void the warranty.

Using controls, adjustments, procedures, connections, or signal types other than those

specified in the Explore documentation may result in electrical and mechanical hazards.

Only use Mentalab approved accessories with this device. If an accessory is not listed, please

Battery

While being charged or connected to a PC / tablet, the device should not be connected to

any subject.

The external power supply must fulfill the IEC/EN 60950-1 and SELV requirements to be used

safely with the device. Do not charge your device with anything other than the USB port of a

certified laptop / PC or a certified mini USB charger. Using a non-certified power supply can

lead to electrical and fire hazards.

Users should not attempt to replace or disconnect the Explore’s battery.

Environment Precautions

The Explore device is not designed for use in inflammable or explosive environments.

It should be used at room temperature. Exposure to conducting material, liquid, fire or heat

above 45° C can lead to overheating or electrical discharge.

Mentalab Explore is not to be used in wet environments either, as liquid intrusion can cause

electrical hazards. When applying electrodes on the subject’s head, the cap and the subject’s

hair should be dry.

Protect the device and electrodes from electrostatic discharge and take all precautions

regarding electromagnetic compatibility.

Signal Transmission

The operation of the movement sensors and wireless transmission can be compromised

within shielded rooms. It is not possible to communicate with the device from outside of the

shield.

Mentalab Explore uses the 2.4 GHz band for wireless transmission, so nearby Bluetooth and

wireless devices can cause interference. Therefore, ensure that enough transmission

bandwidth is available in your environment. We recommend working in environments with

low wireless and noise interference for better performance.

If the equipment is not installed according to the instructions, it may interfere with nearby

devices. If it does, which can be determined by turning the equipment off and on, try the

following measures:

−Reorient or relocate the receiving device.

−Increase the space between the Explore equipment and other wireless devices.

−Use the equipment with proper shielding, especially if a device with high wattage is

nearby.

−Consult the Explore technical support.

Equipment Maintenance

Mentalab Explore uses lightweight, highly flexible cables to provide comfort and easy cap

mounting, especially for multi-channel recording. These cables are sensitive and need to be

treated with special care. Following these guidelines will prolong the lifetime of ExG

electrodes:

−Do not pull on the electrodes’ cables and avoid knots. Do not cut, kink or pinch

electrode cables; light bending is safe.

−Avoid exposure to direct sunlight and chemicals.

−Clean the cables and electrodes from remaining gel, disinfectant, paste or other

residues. Do not use detergents with chlorine or other corrosive agents to clean the

equipment.

−Protect the Explore unit from liquid contamination. Ensure that the whole equipment

is completely dry before storing.

2 Technical Information

2.1 Explore Outline

The Mentalab Explore device is a powerful and flexible solution for mobile biosignal

recordings. It combines research-grade precision with great usability in a mobile format. We

offer several easy-to-use, open-source APIs. Mentalab Explore and its APIs provide you with

rich and easily integrable data pipelines, so you can focus on your application. You can

choose to work with data offline or in real-time. Data can be streamed to any host device

with a Bluetooth module, such as computers and smartphones. Besides precise

multi-channel-ExG, Mentalab Explore also contains a comprehensive set of position and

device sensors.

Figure 1. Explore system overview

2.2 Contents

Based on your order, the box you received should include:

−1 Mentalab Explore device

−1 USB 2.0A to micro-USB cable

−A quick-start guide

−Electrodes and caps of your choice

−Optionally: electrode gel and cleaning solution

2.3 Device Specifications

No. of Channels

4 or 8

ExG Sampling Rate

250 (default), 500 or 1000 sps (in beta phase)

Operation Time

8h online recording, 12h offline recording

Differential Input Range

400 mV

Input Impedance

> 1 GΩ

Resolution

24 bits

USB Output Interface

USB 2.0

Additional Sensors

Magneto- / Gyro- / Accelerometer: 20 sps

Device Temperature, Battery: 1 sps

Flash Memory Size

512 MB

Dimensions

41mm * 42mm * 18mm

Bluetooth Range

10 m

The following picture shows the Explore device label. You can also find it on the Explore case

and on the box. The last four digits on the label define the device’s Bluetooth name. For

example, the label below corresponds to a device whose Bluetooth ID is “Explore_1438”:

Figure 2. Example device label

3 Operation Instructions

3.1 Operating Modes

Mentalab Explore has two main operating modes: offline and online. When in offline mode,

the device collects data and stores it in its internal flash memory. Users can extract the

recordings from the flash memory via a micro-USB cable after the recording. Data can be

retrieved and transformed with different tools provided in the APIs.

During online mode, data is transmitted via Bluetooth in real-time, enabling the user to

collect, monitor, and visualize data, and to configure the device through one of the available

APIs (explorepy, exploreMATLAB and libexplorecpp). In this mode, the Explore device sends

the data and communicates in configuration packets with the API on the host machine.

While you can start using the device right out of the box, we recommend charging it for at

least 1 hour. To charge the device, connect the micro-USB cable to a compliant source. The

green LED indicates sufficient battery. After charging, unplug the device from the power

source.

3.2 First Setup

Set up the measurement electrodes on your subject in your preferred configuration. Each

channel (1-4 or 1-8) is recorded against the reference electrode. The electrodes are

configured in the order depicted below. In a 4-channel device, channels 5-8 are inactive.

Figure 3. Device configuration

Push the button to turn on your Explore system. At system start, the LED shows the battery

level (green > 60 %, yellow 30 - 60 %, red < 30 % charge remaining).

Upon normal start, the device begins to record on the flash memory immediately. It starts

advertising and waits for a Bluetooth connection to a host machine. During advertising

mode, the LED blinks in blue at 2 Hz (twice per second). If no connection is established after

4 minutes, the device will automatically go to offline mode. In this state, the LED blinks in

green at a rate of 1 Hz and the Explore keeps recording data in the internal memory. You can

leave the device in recording mode for as long as you wish. With a full battery, recording for

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