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Elemyo | 07 мая 2021

Overview of the EMG Sensor Set
MYOstack v1.0

Набор ЭМГ датчиков для беспроводной регистрации мышечной активности. ПО для визуализации миографических сигналов
DESCRIPTION
The MYOstack is an open platform that will allow you to create a variety of configurations: a smart bracelet for controlling computer gestures, making a smart muscle activity monitor for sports, tracking physical activity during the day, learning how to control a robotic arm, and much more.

EMG modules have a special curved surface, which ensures good contact of the sensor with the skin surface during active muscle work. A compact Wi-Fi transmitter based on the ESP-WROOM-32 module allows recording the signal of each module with a frequency from 0.5 kHz to 1 kHz. The transmitter has a 32-bit 2-core microprocessor with a clock frequency of 240 MHz, which can be easily reprogrammed for your task from the Arduino IDE.
EMG датчик мышц, способ крепления на предплечье
Fig. 1: the MYOstack v1.0.
IT IS INCLUDED IN THE KIT
MYOstack v1.0 has 3 types of configuration, differing only in the number of EMG sensors.
Each set contains:
:
  • 4, 6 or 9 pcs. EMG modules (depending on your choice)
  • wires for connecting modules: 1 wire per module + 2 additional wires 1 m long
  • adapter, with 10 connectors for connecting modules
  • compact Wi-Fi transmitter based on the ESP-WROOM-32 module (with a pre-installed signal collection and transmission program)
  • Wi-Fi receiver (with preinstalled software)
  • Velcro tape for fastening modules
Схема подключения ЭМГ датчика мышц к микроконтроллеру Arduino
Fig. 2: Configuration options MYOstack v1.0.
CONNECTION
The transmitter and modules have 2 connectors. To connect the module to the transmitter, just connect them with a wire using any of the 2 connectors. To connect several modules to the transmitter, you can connect the modules to each other. If you need to position the modules at spaced out points on the body, you can use the long wires and the included adapter. The modules can be connected in any order and sequence. When turned on, the blue LED on the modules and transmitter will light up.

The wire connectors are made in such a way that the modules are connected in an unambiguous way, the possibility of polarity reversal is excluded.

The transmitter is powered via USB micro input. To supply power, you must use an external power bank with an output voltage of 5 V (when choosing and using a power bank, follow the generally accepted rules of electrical safety. Charging the power bank while using the system is prohibited).

The receiver is connected to a computer via a USB micro cable.

You can attach the sensors to the body using an adhesive plaster or a bandage.

The transmitter and receiver are factory-installed and ready for use right away.

The modules are numbered (if necessary, the numbers can be peeled off). The module number corresponds to the signal number in the MYOstack GUI v1.0.1 program.

To adjust the gain, a linear trimming resistor is installed on each module. The resistor is initially set to zero (gain is 1 V / V). To increase the gain, turn the resistor clockwise. The maximum swing angle is 1200. At the maximum swing angle, the gain is 11 V / V.

NOTE: The transmitter heats up during operation. The higher the transfer rate, the more intense the heating..

INSTALLING THE SOFTWARE
Signal visualization
For visualization, analysis and signal processing, you can use the free MYOstack GUI v1.0.1 program. This program is written in Python and is provided as open source (under the MIT license).

You can download the source code of the program for Python, as well as the ".exe" assembly for Windows 10 from the official ELEMYO page at https://github.com/.

To work with the source code of the program, you can install the Anaconda development environment:

1) Download the free Anaconda development environment for Python programming from the official website https://www.anaconda.com/

2) In the Environments section of Anaconda, install the following extensions:

  • Pyserial version 3.4 or higher
  • Pyqtgraph version 0.1 or higher
  • QtPy version 1.3.1 or higher
  • Numpy version 1.13 or higher
  • Scipy version 0.19 or higher

3) Download the source code for MYOstack GUI v1.0.1 from the link: https://github.com/ELEMYO/MYOstack-GUI/releases/tag/v1.0.1

4) Using Anaconda's built-in Spyder editor, open the downloaded file.

5) Run the code..

Receiver and transmitter firmware (based on ESP-WROOM-32)
Any environment that supports ESP32 modules can be used to flash the transmitter and receiver. The original source code is currently only provided for the Arduino IDE..

Transmitter / Receiver firmware process::

1) install the free Arduino IDE:
https://www.arduino.cc/en/main/software

2) connect the receiver / transmitter via USB to the PC (after disconnecting the sensors from the transmitter)

3) add ESP32 in Arduino IDE board manager
(detailed instruction
:
https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructions/ )

4) select your controller in the section Tools -> Port

5) select the type of programmable platform in the section Tools -> Board -> ESP32 Arduino -> DOIT ESP32 DEVKIT V1

6) to flash the transmitter, use the sketch at the link (in the code, you must specify the MAC address of the receiver, an instruction about how to find the MAC address is here):

https://github.com/ELEMYO/MYOstack-ESP32/blob/main/examples/Sender/Sender.ino

to flash the receiver, use the sketch at the link:

https://github.com/ELEMYO/MYOstack-ESP32/blob/main/examples/Receiver/Receiver.ino

7) upload the sketch to the board Sketch -> Upload

NOTE: if the receiver is not being flashed, it is necessary to press and hold the enable button on the receiver board when starting the flashing.
The review will be updated, do not miss it!
Last update:
07 MAY / 2021
Set of EMG sensors
MYOstack v1.0
249,90$-459,90$
(depends on configuration)
The set of compact EMG modules MYOstack v1.0 for wireless registration of EMG signals. Registration of the activity of nine muscle groups at the same time, wireless signal transmission via Wi-Fi up to 200 meters, the compactness of the modules, ease of installation and configuration - all this makes the kit an indispensable tool for modern tasks of robotics and sports.
copyright: Elemyo