OYMotion Technologies gForce OYM-GF-P001 User manual

gForce EMG Armband
User Guide
OYMotion Technologies Co., Ltd
www.oymotion.com
[e-mail]
All Copyrights Reserved ©2015-2021
Version: V1.0.1

OYMotion Technologies Co., Ltd All Rights Reserved©2015-2020
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1. Trademarks and Copyrights ................................................................................................................................................. 1
2. gForce Introduction................................................................................................................................................................. 1
3. gForce Models.......................................................................................................................................................................... 1
4. gForce Products....................................................................................................................................................................... 1
5. Product Details ......................................................................................................................................................................... 2
5.1 gForce Armband Hardware Components.......................................................................................................... 2
5.2 gForce Armband Size and Weight ....................................................................................................................... 2
5.3 gForceDongle BLE to USB Receiver...................................................................................................................... 3
5.4 gForceJoint BLE to UART Adapter ........................................................................................................................ 3
6. System and User Instructions ............................................................................................................................................... 4
6.1 OS Platforms Supported by gForce...................................................................................................................... 4
6.2 gForceApp Mobile Application.............................................................................................................................. 5
6.3 gForce Armband User Instructions....................................................................................................................... 5
7. gForce EMG Armband Parameters .................................................................................................................................... 7
8. gForceDongle Parameters .................................................................................................................................................... 9
9. Packaging Item List................................................................................................................................................................10
9.1 gForcePro+ EMG Armband..................................................................................................................................10
9.2 gForce200 Gesture Armband...............................................................................................................................10
10. Tech Support......................................................................................................................................................................11
10.1 gForceSDK For Windows .......................................................................................................................................11
10.2 gForceSDK For Android .........................................................................................................................................11
10.3 gForceSDK For Arduino/Embedded...................................................................................................................11
10.4 gForceSDK for Unity3D ..........................................................................................................................................11
10.5 SDK Manual ...............................................................................................................................................................12
11. Contact US ..........................................................................................................................................................................12

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1. Trademarks and Copyrights
gForceTM is the trademark registered by OYMotion Technologies Co., Ltd.
2. gForce Introduction
The gForceTM EMG armband is designed and manufactured by OYMotion. The armband contains
8 highly sensitive EMG sensors with differential dry electrodes, 9-axis IMU motion sensor, and
communicates through Bluetooth BLE 4.2. There are 2 variations of the gForceTM armband, each
with differing kinds of data it can collect ranging from EMG raw data access, gesture training and
AI model update, gesture recognition, to IMU raw data and quaternion access (see table below).
3. gForce Models
OYM-GF-P001, OYM-GF-B001, OYM-GFD-001, OYM-GFJ-001
4. gForce Products
Model
Product Name
Features
OYM-GF-P001
gForcePro+ EMG Armband
■Pose Data ■Gesture Recognition
■EMG Raw Data1■Gesture Training2 ■Color: Orange
OYM-GF-B001
gForce200 Gesture Armband
■Pose Data ■Gesture Recognition ■Color: Black
OYM-GFD-001
gForceDongle BLE to USB
Receiver
BLE to USB dongle receiver works on Windows 7 and newer to pair-
with and communicate with gForce Armband to get gesture index,
EMG raw data, pose data.
OYM-GFJ-001
gForceJoint Adapter
BLE to UART adapter to get gesture index, pose data and forward to
such like Arduino MCU system.
Note: 1. Max 1000Hz sample rate, configurable through SDK 2. Work with gForceApp

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5. Product Details
5.1 gForce Armband Hardware Components
5.2 gForce Armband Size and Weight
Measurement
Value
Inner Diameter
65mm-90mm (max)
Height
40 mm
Thickness
10 mm
Weight
78 g

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5.3 gForceDongle BLE to USB Receiver
The gForceDongle is only compatible with Windows 7 or newer. The gForce armband SDK for
Windows works with gForceDongle only. The gForceDongle communicates wirelessly through
BLE with the gForce armband to send commands to and receive data from gForce.
Measurement
Value
Length
35 mm
Width
20 mm
Thickness
8 mm
Weight
4 g
OYM8CHWAVE open source project receiving data from gForcePro+ through gForceDongle
5.4 gForceJoint BLE to UART Adapter
The gForceJoint will pair automatically with any nearby gForce through BLE communication and
forward data received from gForce to an UART port on board the gForceJoint. The data collected
are gesture indexes recognized from the 8 EMG sensors and quaternion data from the 9-axis
IMU sensors. An MCU system such as Arduino can connect with the UART port and receive the
gesture indexes and IMU data. The gForceJoint DOES NOT support EMG raw data forwarding.

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Arduino MCU receives gesture and quaternion data from gForce through gForceJoint BLE to UART adapter
6. System and User Instructions
6.1 OS Platforms Supported by gForce
Platform
Features
Windows: Win 7 / 8 / 10
⚫SDK for Windows
⚫Unity3D SDK
⚫gForceDongle BLE to USB Dongle is mandatory
Android
⚫Android with BLE 4.2 and up support
⚫Android Unity3D SDK
⚫gForceApp Mobile APP
Embedded
⚫SDK for Arduino/Embedded
⚫Arduino/Embedded
⚫gForceJoint BLE to UART Adapter is mandatory

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6.2 gForceApp Mobile Application
The gForceApp is a mobile application running on Android. The gForceApp is designed for gForce
armband to view gesture results, check pose data, view EMG data, conduct gesture training, have
gForce firmware OTA update, and parameter tuning. The gForcePro+ EMG armband supports
full features of gesture training, cloud-based AI model generation, and armband model
synchronization. With the gForceApp, users can customize their own gestures and then update
the gForcePro+ with the newly trained/created gesture. The new gesture model will be saved
within the gForcePro+ to replace the old one. Refer to “gForceApp User Guide”for more
instructional details.
6.3 gForce Armband User Instructions
⚫The stainless-steel electrodes on the inner side of the gForce should make good contact
with the user’s skin or else the EMG sensor might not pick up the data properly.
⚫The wearing position of the armband must remain consistent between gesture training

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and gesture recognition.
⚫The gForce200 comes embedded with a predefined gesture model (6 gestures), it
requires user to follow a predefined wearing position. When wearing on the right arm,
make sure the USB port points to palm of the hand (refer to image below). When wearing
on the left arm, make sure the USB port points toward the inside of the elbow.
Example of gForce200 on user’s right arm
Predefined 6 gestures of gForce200

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⚫Powering on: To turn on, press and hold the power button on gForce until the green
LED is on then release the button. The gForce will vibrate and the green LED will flash at
a 1Hz frequency, this means that the armband is looking for a BLE connection. When
gForce is connected thru BLE, the green LED will stop flashing and remain on. If the
green LED flashes at a 2.5Hz frequency it, means there is data transaction.
⚫Firmware update mode: Press and hold the power button on gForce for 10 seconds to
activate firmware update mode. This should only be used when the armband is not
working properly. User can then update the firmware through the gForceApp. gForce
can return to normal mode by powering off and powering on again.
⚫Powering off: To turn off, press and hold the power button for 5 seconds. Afterwards,
the green LED will turn off indicating power off (if the internal IMU’s auto calibration is
successful, the green LED will flash three times first otherwise it will just turn off).
⚫Charging: When charging a red LED will be on until the armband finishes charging after
which the led will turn off.
7. gForce EMG Armband Parameters
Features
Value
Communication
⚫BLE4.2 Standard
Distance
⚫10 Meters
Power Consumption
⚫0.1W
Battery
⚫200mAh/3.7V Li-ion
Power Input
⚫USB 5V
Color
⚫gForce200: Black
⚫gForcePro+: Orange

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Gestures
⚫gForce200：6 Predefined Gestures
⚫gForcePro+：Up to 16 user customizable gestures
(gestures must have noticeable EMG differences)
EMG Raw Data
(gForcePro+ only)
⚫Realtime EMG raw data access supported
⚫Sample rate：max 1000Hz
⚫ADC：8bit (max 1000Hz sample rate)
12bit (max 500Hz sample rate)
⚫Channels: 8
⚫Gain: 1200
⚫Filter: 20-500Hz hardware band pass filter
IMU Raw Data
⚫9-axis IMU motion sensors
⚫Sample rate: 50Hz
⚫ACC, GYRO, MAG raw data access
Pose Data
⚫Quaternion access
⚫Euler access
⚫Rotation Matrix access
⚫Sample Rate: 50Hz

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Software Support
⚫SDK For Windows
⚫SDK For Android
⚫SDK For Arduino/Embedded
⚫Unity3D SDK for Windows/Android
⚫Open Source oym8chwave Project to Capture EMG
Raw Data, IMU, etc
⚫gForceApp Mobile APP
8. gForceDongle Parameters
Item
Parameter
Radio Frequency
BLE 2402-2480MHZ
Power Input
USB 5V
Radio Power
4dBm
Antenna Type
Ceramic
Antenna Gain
-0.5dBi

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9. Packaging Item List
9.1 gForcePro+ EMG Armband
Items
Quantity
gForcePro+ EMG Armband (Orange)
1
gForceDongle BLE to USB Dongle
1
USB Cable
1
9.2 gForce200 Gesture Armband
Items
Quantity
gForce200 Gesture Armband (Black)
1
gForceJoint BLE to UART Adapter
1
USB Cable
1

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10. Tech Support
10.1 gForceSDK For Windows
gForceSDK C++ for Windows contains the gForce SDK lib, header files, readme and
sample projects for developers to start with Windows platform.
Download: https://github.com/oymotion/gForceSDKCXX
OYM8CHWAVE open source sample project to start with:
https://oymotion.github.io/APPs/oym8CHWave/
10.2 gForceSDK For Android
gForceSDK for Android contains the gForce SDK lib, header files, readme and sample
projects for developers to start with Android platform.
Download: https://github.com/oymotion/gForceSDKAndroidDemo
10.3 gForceSDK For Arduino/Embedded
gForceSDK for Arduino contains the gForce SDK C source code, header files (Quaternion
and Gesture indexes only, no EMG or IMU raw data access), sample project for Arduino.
This SDK C source code interfaces with gForceJoint through UART and to parse the
Quaternion and Gesture indexes received. Developers can port the same logic to other
embedded system.
gForceSDK for Arduino works with gForceJoint only.
Download: https://github.com/oymotion/gForceSDKArduino
10.4 gForceSDK for Unity3D
gForceSDK for Unity3D contains the gForce SDK lib, header files, sample U3D projects.
It supports both Windows and Android.

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Download：https://github.com/oymotion/gForceSDKUnity.git
10.5 SDK Manual
Before developers start coding own projects, DO spend time going thru the SDKs manual:
https://oymotion.github.io/gForceSDK/gForceSDK/
We have outlined most of the important information at:
https://oymotion.github.io/
11. Contact US
OYMotion Technologies Co., Ltd
⚫Address: Flr 6, Bldg 2, 222 Guangdan Road, Shanghai, PRC
⚫Tel: [phone]
⚫Email: [email protected]
⚫Website: www.oymotion.com
⚫Download: https://www.github.com/oymotion