OYMotion Technologies OHand2CH OYM-OH-A001LS-B001 User manual

OHandTM Smart Bionic Hand
User Guide
OYMotion Technologies Co., Ltd
www.oymotion.com

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1. Trademarks and Disclaimers ...........................................................................................................................1
2. Warnings .............................................................................................................................................................1
3. Models .................................................................................................................................................................1
4. Applicable Cases ............................................................................................................................................... 2
5. Major Components and Dimensions ............................................................................................................ 2
5.1. OHandTM Major Components ..............................................................................................................2
5.2. OHandTM Structure ................................................................................................................................ 3
5.3. OHandTM Dimensions ...........................................................................................................................3
5.4. Passive Rotatory Wrist Diameter ....................................................................................................... 4
5.5. Sensor and Lamination Dummy ........................................................................................................ 5
5.6. Battery and Charging Base ................................................................................................................. 5
6. Assembly Instructions ...................................................................................................................................... 7
6.1. Assembly ................................................................................................................................................ 7
6.2. Factory Settings .....................................................................................................................................8
6.3. Muti-functional Button Switch and Message Beeper ................................................................... 9
6.4. Grips And Mode Switch .....................................................................................................................10
6.5. Grips Slots ............................................................................................................................................ 20
6.6. Grip Lock/Unlock Feature ................................................................................................................. 20
7. Storage, Transportation and Environment Conditions ........................................................................... 20
8. Design Parameters ..........................................................................................................................................21
8.1. Strength and Speed ............................................................................................................................21
8.2. Weight ...................................................................................................................................................21
8.3. Power Supply .......................................................................................................................................21
8.4. Battery ...................................................................................................................................................21
8.5. Power Connector ................................................................................................................................ 22
8.6. Sensor Interfaces .................................................................................................................................22
9. Battery and Charging ..................................................................................................................................... 23
10. Maintenance, Warranty, Repairs and Returns ...................................................................................... 23
10.1. Maintenance .................................................................................................................................... 23
10.2. Warranty and Repairs .................................................................................................................... 24
10.3. After-Sales Services ........................................................................................................................24
11. Common Issues ........................................................................................................................................... 24
12. Packing List .................................................................................................................................................. 25
13. OHand APP Download ...............................................................................................................................26
14. Contact US ....................................................................................................................................................26

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1. Trademarks and Disclaimers
OHandTM is the trademark registered by OYMotion Technologies Co., Ltd (OYMotion). The OHandTM
bionic hand was developed by OYMotion based on intellectual properties. Any party without a written
permission from OYMotion is not allowed to copy any part of this document.
2. Warnings
2.1. Warning: Do not expose Li-ion battery to heat, doing so will damage or shorten battery life.
2.2. Warning: Do not place the OHandTM close to any life-supporting medical devices such as a
pacemaker.
2.3. Warning: OHandTM is not water-resistant (IPX-0). If the OHandTM is exposed to liquids internally it can
cause short circuits, rusting, and none reversible damages to the circuits, motors, and gears. Users
shall store the hand away from liquids and away from damp and dusty environments.
2.4. Warning: The main frame and the body of the OHandTM is made of aluminium, stainless steel, silicon
rubber and plastic. If user exceeds the specified loads on the hand it will cause none reversible
damages to the hand. Furthermore, collisions can cause warping to the materials and potential non
reversible damages.
2.5. Warning: It is on the user to be fully responsible to comply with local regulations before operating
any powered machines.
2.6. Warning: It is on the user to be fully responsible to comply with local regulations before operating
any or motorized vehicles.
2.7. Danger: Do not wear the OHandTM while it is charging.
2.8. Use alcohol wipes to clean the sensors’ electrodes and socket frequently especially after use.
Immediately wipe and dry the socket with a napkin after cleaning.
2.9. Turn off OHandTM when it’s not in use to save battery.
3. Models
Device Name
Features
Model (Left Hand)
Model (Right Hand)
OHand2CH
Long Thumb Finger
2 Sensors, 18 Grips
OYM-OH-A001LS-B001(Silver)
OYM-OH-A001LB-B001(Black)
OYM-OH-A001RS-B001(Silver)
OYM-OH-A001RB-B001(Black)
OHandSE
Short Thumb Finger
2 Sensors, 9 Grips
Touchscreen Finger Pads
OYM-OH-A001LSA-B101(Silver)
OYM-OH-A001LBA-B101(Black)
OYM-OH-A001RSA-B101(Silver)
OYM-OH-A001RBA-B101(Black)
OHand
Short Thumb Finger
2 Sensors, 18 Grips
Touchscreen Finger Pads
OYM-OH-A001LSA-B201(Silver)
OYM-OH-A001LBA-B201(Black)
OYM-OH-A001RSA-B201(Silver)
OYM-OH-A001RBA-B201(Black)

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4. Applicable Cases
OHandTM smart bionic hand is designed to fit upper limb amputees. For above elbow amputation, an extra
and compatible elbow is needed and configured in the OHand APP software.
5. Major Components and Dimensions
5.1. OHandTM Major Components
OHandTM Smart Bionic Hand Package
OHandTM Smart Bionic Hand Package
1OHandTM Smart Bionic Hand 2-Channel User Guide
2OHandTM Smart Bionic Hand User Guide
3OHandTM Smart Bionic Hand Li-ion Battery (2-Pieces)

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4OHandTM Smart Bionic Hand Li-ion Battery Compartments (Removable Battery Only)
5OHandTM Smart Bionic Hand Li-ion Battery Dummy (Removable Battery Only)
6OHandTM Smart Bionic Hand Charging Base (Removable Battery Only)
7OHandTM Smart Bionic Hand sEMG Sensors
8OHandTM Smart Bionic Hand AC220/110 to DC12V/8.4V Power Adapter
9OHandTM Smart Bionic Hand Packing Box
10 OHandTM Smart Bionic Hand (2-Channel BLE Controller)
5.2. OHandTM Structure
5.3. OHandTM Dimensions
There are two sizes of the OHand. The hand with a Bluetooth device name as OHand2CH is the
long-thumb version. And the one with a Bluetooth device name as OHand or OHandSE is the short-thumb
version.
OHand2CH – Long-Thumb Version

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OHandSE,OHand – Short-Thumb Version
Dimensions
Size and Angle
OHand2CH
OHand, OHandSE
Middle finger tip to hand base
179 mm±2mm
Thumb tip to hand base
97mm±2mm
88mm±2mm
Thumb Length
111mm±2mm
101mm±2mm
Palm width
83 mm±2mm
Wrist height (Outside socket)
13 mm
Wrist height (Inside socket)
15 mm
Wrist diameter (Outside socket)
53 mm
Wrist diameter (Inside socket)
47 mm
Wrist rotation range
±175 Degree
Thumb swing range (Lateral)
0~31 Degree
Thumb swing range (Opposed)
0~50 Degree
Touchscreen Finger Pads
No
Yes
5.4. Passive Rotatory Wrist Diameter
Wrist Diameter 47 mm

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5.5. Sensor and Lamination Dummy
sEMG Sensor
Outer and Inner Socket Sensor
Dummy
sEMG Sensor With Sensitivity Adjustment
5.6. Battery and Charging Base
The Li-ion battery is the power supply to the OHandTM Smart Bionic Hand. Charge the battery with the
power adapter provided when the battery level is low. OHandTM provides user with two battery types to
choose.
5.6.1. Battery Types
5.6.1.1. Removable Battery and Accessories
Battery
Charging Base
Battery Compartment

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5.6.1.2. Internal Battery
Lamination Battery Dummy for Outer Socket
Removable Battery Charger: DC 12V
Remove the battery from its compartment by pulling the lock and then plug the battery into the charging
base as shown in following pictures.
Top View
Side View
Charging a Battery Plugged In Base
As shown in the pictures, there is a dual color LED on the charging base that indicates charging status.
While charging the LED will be red and when the battery is fully charged the LED will be green.
ATTENTION: If charging base is not powered while the battery is plugged in, the green LED will turn on,
this does not mean the battery is fully charged. User must make sure the charging base is properly
powered by a DC 12V adapter provided with OHandTM.

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Internal Li-ion Battery
Internal Battery Charger: DC 8.4V
Internal battery is mounted between the outer and inner prosthetic limb sockets. The charing port is
mounted on the outer socket by opening a hole. To charge the battery, the DC 8.4V charger is used. A
dual-colored LED on the charger indicates the status, green means fully charged and red means charging.
To replace the internal battery, OHand needs to be removed from outer socket first.
WARNING:
1. Remove prosthetic hand from user’s arm when charging
2. Only use the DC 8.4V charger provided by OYMotion
6. Assembly Instructions
The OHandTM smart bionic hand has one power and two EMG sensor connectors. It’s powered by a 2-cell
7.4V Li-ion battery and driven by two EMG sensors acting as open/close switches.
6.1. Assembly
6.1.1. Removable Battery System Connection
The following picture shows how to connect the OHandTM with one removable battery’s compartment and
two EMG sensors:

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Removable Battery System Connection
6.1.2. Internal Battery System Connection
The following picture shows how to connect the OHandTM with one internal battery and two EMG sensors:
Internal Battery System Connection
6.2. Factory Settings
OHandTM is preloaded with 27 functional grip patterns from which user can choose. User and technician can
adjust OHand’s settings based on needs. Each grip can be turned on or off, and be assigned to any slot. The

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adjustment is done through the mobile OHand APP software. Settings can be saved on cloud server and
later be restored into OHand. User can reset OHand by applying default setting from cloud in OHand APP.
Note:
The OHand model of OHandSE doesn’t support the Secondary grips. Hence, user can select in total 9
grips from the 27.
6.3. Muti-functional Button Switch and Message Beeper
A mutifunctional button is installed on the back of OHand and inside the OHand there is a message beeper.
6.3.1. Power ON
Press and hold the button for 1 second until the green LED underneath the button lights up.
Afterwards, release the button to switch the hand ON, and the hand beeps for 1 second.
6.3.2. Power OFF
6.3.2.1. Mode 1
To turn the hand off, press and hold the button for 4 seconds, release when it beeps. The hand will
turn off with the green LED off too. In this mode, the hand keeps its current grip.
6.3.2.2. Mode 2
To turn the hand off, quickly press the button five times with an interval of less than 1 second. The
hand’s fingers will spread out to its relaxed grip, then after a beep, the hand will turn off.
6.3.3. Alternate between Primary and Secondary Grip Patterns
When OHandTM is powered on and at its any relaxed grip, User can press the button for less than 1
second to switch between primary and secondary grip pattern groups, there’s a beep to indicate
Thumb positions
adjusted manually
when OHandTM is fully
open
Mode switched by
button click on hand
back when OHandTM is
fully open
Open-Open signals to switch to next grip when OHandTM is
fully open
Thumb Position
Primary Alternate
Default Grip
Grip 2
Grip 3
Lateral
Primary
Key
Column
Mouse
Secondary
Fist
Salute
Chostick
Opposed 1
Primary
Pinch-Index-Thum
b-Close
Grasp
Pinch-Index-Open
Secondary
Plate
Buckle
Pinch-Index-Close
Opposed 2
Primary
Grasp
Tripod-Index-Thum
b-Close
Tripod-Thumb-Close
Secondary
Tripod-Index-Ope
n
Plate
Tripod-Thumb-Open

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the switch. The primary and secondary grip patterns are determined by the position of thumb finger.
After switching, the default grip is choosed. Note: The OHand model of OHandSE doesn’t
support the Secondary grips feature.
6.3.4. Grip Lock/Unlock
When the OHand is at any non-relaxed grip, quickly press the button to lock/unlock the hand grip,
the hand will beep shortly as a reminder. When the hand is locked, it will not react to either the
close or the open signal. This function is used to hold an object for a period.
6.3.5. Bootloader Mode
When the OHand is powered off, press and hold the button for at least 10 seconds. OHandTM will
enter its Bootloader mode. The green LED underneath the button continuously blinks. There will be
a mandatory update on the firmware when it’s under Bootloader mode and the update goes
through OHand APP. User needs to be cautious not to have the button pressed and held
accidently when OHandTM is powered off.
6.4. Grips And Mode Switch
6.4.1. Thumb Positioning Modes
6.4.1.1. Lateral Mode: Move thumb outbound to its max position.(thumb is parallel with the fingers of
the hand).
6.4.1.2. Opposed Mode 1: Move thumb inbound until it gets to a position that opposes just the index
finger.
6.4.1.3. Opposed Mode 2: Move thumb inbound to its max position that opposes both index and
middle finger.
Lateral Mode
Opposed Mode 1
Opposed Mode 2
6.4.2. Relaxed Grip: When all 5 fingers are in their fully open position, it is the relaxed grip.
6.4.3. Functional Grips: The following gestures should start from the original position (relax).

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Position
Gestures
Function
Details
Lateral Mode
Fist
Hold objects such as toothbrush
6.4.3.1.1.
Mouse
Click or hold the left button of the mouse
6.4.3.1.2.
Key
Users may hold the pen and write
6.4.3.1.3.
Point
Use Index fingers to point objects
6.4.3.1.4.
Column
Push heavier object, such as doors or windows
6.4.3.1.5.
Palm
Lift objects such as bowls and plates
6.4.3.1.6.
Salute
Salute or high-five
6.4.3.1.7.
Chopstick
Operate a specially designed Chopsticks
6.4.3.1.8.
Opposed
Mode 1
Buckle
Control objects with handles and switch
6.4.3.2.1.
Pinch-Index-Close
Take objects placed on the surfaces
6.4.3.2.2.
Pinch-Index-Open
Take strings from the surfaces
6.4.3.2.3.
Pinch-Thumb-Close
Take strings from the surfaces
6.4.3.2.4.
Pinch-Thumb-Open
Gesture “OK”
6.4.3.2.5.
Pinch-Index-Thumb-Close
Take thicker objects form the table
6.4.3.2.6.
Power
Take and hold the bags by handles
6.4.3.2.7.
Grasp
Take cylindrical objects like cups
6.4.3.2.8.
Lift
Take objects with a handle, like suit cases
6.4.3.2.9.
Plate
Lift plates or bowls and press by the thumb
6.4.3.2.10.
Opposed 2
Tripod-Index-Close
Hold cylindrical containers like cups
6.4.3.3.1.
Tripod-Index-Open
Take strings from the surfaces
6.4.3.3.2.
Tripod-Thumb-Close
Take strings from the surfaces
6.4.3.3.3.
Tripod-Thumb-Open
Take strings from the surfaces
6.4.3.3.4.
Tripod-Index-Thumb-Close
Take thicker objects form the table
6.4.3.3.5.
Power
Take and hold the bags by handles
6.4.3.3.6.
Grasp
Take cylindrical objects like cups
6.4.3.3.7.
Lift
Take objects with a handle, like suit cases
6.4.3.3.8.

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Plate
Lift plates or bowls and press by the thumb
6.4.3.3.9.
6.4.3.1. Thumb Lateral Mode (8 grips)
6.4.3.1.1. Fist
Start from the lateral relaxed position. Using the
close signal the 4 fingers will flex inwards until they
are close to the palm. Then the thumb will flex
inwards to reach the index finger’s side. To open the
hand use a open signal which will first open the
thumb then the remaining fingers. The lateral fist
grip is useful for holding bar shaped objects e.g
toothbrushes, forks, spoons, etc.
6.4.3.1.2. Mouse
Start from the lateral relaxed position. Using the
close signal, both the thumb and pinky will flex
inwards to caress the shape of a mouse. Afterwards
a close signal will be used to flex the index finger so
it can click on the mouse. To open the hand use an
open signal which will return the hand to its relaxed
position. As the name suggests the grip is used to
control a mouse.
6.4.3.1.3. Key
Start from the lateral relaxed position. Using a close
signal the four fingers will flex inwards until it
reaches the palm except for the index finger which
will stop halfway. Then the thumb will close on side
of the index finger. To open the hand back to the
relaxed position use an open signal. Key grip is used
to hold thing that are thin and small such as keys,
disks, cards, paper, zippers, and shoelace. This
position is also useful in holding pens and spoons.

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6.4.3.1.4. Point
Start from lateral relaxed position. Using a close
signal it will flex all fingers inwards except for the
index finger. Using an open signal will return the
hand back to the relaxed grip. This grip is useful for
clicking light objects, such as keyboards, door bells,
or remote controllers.
6.4.3.1.5. Column
Start from lateral relaxed position. Using a close
signal will close every finger to the max position
except for the index finger. After all fingers are
closed the index finger will close on top of the
thumb using the thumb as a brace. An open signal
will return the hand back to the relaxed grip. This
position is useful when the user need to push
something heavy such as a door.
6.4.3.1.6. Open Palm
Start from lateral relaxed position. Using a close
signal all the fingers will flex inwards a little to make
a cupping shape. An open signal will return the hand
back to the relaxed grip. This position is useful for
holding objects such as a bowl.
6.4.3.1.7. Salute
Start from lateral relaxed position. Using a close
signal the thumb will flex halfway. An open signal will
return the hand back to the relaxed grip. This
position is to put the hand at a more natural
position.

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6.4.3.1.8. Chopstick
Start from lateral relaxed position. Using a close
signal all fingers will close except the index finger
and the thumb which will close halfway. A second
close signal will trigger the index finger to flex
inwards more. A short open signal will extend the
index finger back a little. An open signal will return
the hand back to the relaxed grip. This grip is used
only with specially designed chopsticks.
6.4.3.2. Thumb Opposed Mode 1
6.4.3.2.1. Buckle
Start from opposed mode 1 relaxed position. Using a
close signal every finger except the index
finger will flex inwards halfway. Then the index finger
will flex until it touches the thumb. A short open
singal will extend the index finger back. A long or
second open signal return the hand back to the
relaxed grip. This grip is useful grabbing thing such
as hair dryer, or objects with a trigger function.
6.4.3.2.2. Pinch-Index-Close
Start from opposed mode 1 relaxed position. Using a
close signal every finger except the index finger will
close inwards to the palm. The thumb will stop half
way then the index finger will join the thumb. A short
open signal will extend the index finger. A long or
second open signal will return the hand to the
relaxed position. This grip is useful for picking up
thin objects such as napkin, a bar of chocolate or
shoelace.
6.4.3.2.3. Pinch-Index-Open
Start from opposed mode 1 relaxed position. Using a
close signal the thumb will bend inwards to halfway
then the index finger till it touches the thumb. A
short open signal will extend the index finger. A long
or second open signal will return the hand to the
relaxed position. This grip is useful for picking up
thin objects such as picking up napkin, a bar of
chocolate or shoelace with middle to pinky fingers
extending.

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6.4.3.2.4. Pinch-Thumb-Close
Start from opposed mode 1 relaxed position. Using a
close signal all the finger will bend in except for the
thumb. The index finger will stop halfway and the
thumb will bend to join the index finger. A short
open signal will extend the thumb. A long or second
open signal will return the hand to the relaxed
position. This grip is useful for picking up thin
objects such as picking up napkin, a bar of chocolate
or shoelace.
6.4.3.2.5. Pinch-Thumb-Open
Start from opposed mode 1 relaxed position. Using a
close signal the index finger will bend inwards to
halfway then the thumb will bend to joint the index
finger. A short open signal will extend the thumb. A
long or second open signal will return the hand to
the relaxed position. This grip is useful for picking up
thin objects such as picking up napkin, a bar of
chocolate or shoelace.
6.4.3.2.6. Pinch-Index-Thumb-Close
Start from opposed mode 1 relaxed position. Using a
close signal every finger will bend inwards except for
the index and thumb. Afterwards using the close
signal the index and thumb will join. A short open
signal will extend the index finger and the thumb. A
long or second open signal will return the hand to
the relaxed position. This grip is useful for picking up
thin objects such as picking up napkin, a bar of
chocolate or shoelace.
6.4.3.2.7. Power
Start from oppose mode 1 relaxed grip. Using a
close signal the 4 fingers will bend inwards. Then the
thumb will bend over the fingers. Using an open
signal will return the hand back to the relaxed
position by extending the thumb first and then the
other fingers. This grip is useful for grabbing heavy
objects.

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6.4.3.2.8. Grasp
Start from oppose mode 1 relaxed grip. Using a
close signal all fingers will flex inwards. Using an
open signal will return the hand back to the relaxed
position. This grip is useful for shaking hands,
grabbing water bottles, or other round objects.
6.4.3.2.9. Lift
Start from oppose mode 1 relaxed grip. Using a
close signal the 4 fingers will bend inwards halfway.
Then the thumb will bend halfway over the fingers to
make a hook. Using an open signal will return the
hand back to the relaxed position. This partially close
grip is useful for lifting heavy objects such like a
suitcase or shopping bag.
6.4.3.2.10. Plate
Start from opposed mode 1 relaxed mode. Using a
close signal all fingers except the thumb will flex
inwards slightly. Then the thumb will close over the
fingers. Using an open signal will return the hand to
the relaxed position. Plate grip is used to hold flat
objects such like a dish plate or a book.

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6.4.3.3. Thumb Opposed Mode 2
6.4.3.3.1. Tripod-Index-Close
Start from opposed mode 2 relaxed position. Using a
close signal the pinky and ring finger will bend
inwards and the thumb will flex halfway. Then the
index and middle finger will bend to join the thumb.
A short open signal will extend the index and middle
fingers. A long or second open signal will return the
hand back to the relaxed position. This grip is useful
for picking up bar-shaped objects with three fingers.
This grip is also ideal to hold a mugs or cups.
6.4.3.3.2. Tripod-Index-Open
Start from opposed mode 2 relaxed position. Using
the close signal the thumb will flex halfway. Then the
index and middle finger will bend to join the thumb.
A short open signal will extend the index and middle
fingers. A long or second open signal will return the
hand back to the relaxed position. This grip is useful
for picking up bar-shaped objects with three fingers.
6.4.3.3.3. Tripod-Thumb-Close
Start from opposed mode 2 relaxed position. Using a
close signal the pinky and ring finger will bend
inwards and the index and middle finger will flex
halfway. Then the thumb will flex to join the index
and middle fingers. A short open signal will extend
the thumb. A long or second open signal will return
the hand back to the relaxed position. This grip is
useful for picking up bar-shaped objects with three
fingers. This grip is also ideal to hold a mugs or cups.

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6.4.3.3.4. Tripod-Thumb-Open
Start from opposed mode 2 relaxed position. Using a
close signal the index and middle fingers will flex
halfway. Then the thumb will flex to join the index
and middle fingers. A short open signal will extend
the thumb. A long or second open signal will return
the hand back to the relaxed position. This grip is
useful for picking up bar-shaped objects, books, and
tissues with three fingers.
6.4.3.3.5. Tripod-Index-Thumb-Close
Start from opposed mode 2 relaxed position. Using a
close signal the pinky and ring finger will bend
inwards. Then the thumb, index and middle finger
will bend and meet halfway. Using an open signal
will return the hand back to the relaxed position. This
grip is useful for grabbing bar shaped objects, zipper
tabs, and shoelace with three fingers.
6.4.3.3.6. Power
Start from oppose mode 2 relaxed grip. Using a
close signal the 4 fingers will bend inwards. Then the
thumb will bend over the fingers. Using an open
signal will return the hand back to the relaxed
position by extending the thumb first and then the
other fingers. This grip is useful for grabbing heavy
objects.
6.4.3.3.7. Grasp
Start from oppose mode 2 relaxed grip. Using a
close signal all fingers will flex inwards halfway. Using
an open signal will return the hand back to the
relaxed position. This grip is useful for shaking
hands, grabbing water bottles, or other objects.