User's Guide

Table Of Contents

9. Operation Instructions

9.1. Use of disposable electrodes: The gForceDual

has 5 connecting wires: 2 pairs

(adjacent green and yellow snaps makes one pair) of EMG differential wires and a single

reference level output wire (black snap and in middle). Connect the disposable

electrodes to the wires through the snaps. Each pair of electrodes need to stick on the

skin of the interested muscle, be close to each other and along the direction of muscle

contraction. The reference level output electrode with the black snap should stick on a

bony area where muscle activity is relatively low.

9.2. EMG raw data: The gForceDual

is mainly used to monitor contractions of two muscles

of the arm through the two differential pairs of EMG sensor. It is usually used to monitor

two opposite muscles, such as flexor and extensor muscles in the forearm, or bicep and

tricep muscles in the upper arm.

9.3. Powering on: When the gForceDual

wrist band device is turned off, press the switch

button for 1 second to turn the device on, after, a green LED below the button flashes at

a frequency of 1Hz. There’s a short vibration as well to indicate successful powering on.

The devices will then wait for a BLE connection. Once the device establishes a BLE

connection with the Rehab Game App the green LED stays on. Once data or commands

start to transmit the green LED flashes faster at a frequency of 2Hz.

9.4. Entering firmware upgrade mode: To enter firmware upgrade mode press the button

for 15 seconds or until the green indicator light flashes 5 times rapidly first then flashes

slowly. This indicates that the gForceDual

wrist band switches to firmware upgrade

mode, the BLE device name changes to gForceDual-BOOT. Entering this mode is only

recommended if the device’s firmware is damaged or the device is not working as

expected. Upon entering this mode, the user can force a firmware upgrade on the device

through the “gForce App”. When upgrade finishes, power off the device and on the next

power on cycle the device returns to normal work mode.

9.5. Powering off: When the gForceDual

wrist band is turned on, press the button for 5

seconds and release to turn the device off. The green LED will flash 3 times if the internal

IMU sensor is automatically calibrated successfully during use or otherwise the device

will just turn off.

9.6. Charging: To charge the gForceDual

wrist band connect the device via the USB

interface. When charging, the red LED turns on. Once charging finishes the red LED turns

off.