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What is OP3?

Open Platform Humanoid Project

ROBOTIS OP3 is the latest miniature humanoid robot platform from ROBOTIS that succeeds ROBOTIS OP(aka “DARWIN OP”) and ROBOTIS OP2(aka “DARWIN 2” or “DARWIN OP2”). One of the noticeable changes of ROBOTIS OP3 is made in actuator by replacing MX-28 actuators with XM-430 actuators. Another significant change is also made in internal PC by replacing Atom based SBC(Single Board Computer) with Intel i3 based NUC. With the XM-430 which supports DYNAMIXEL Protocol 2.0, OP3 has improved torque along with current based control and loaded with various functions. Intel NUC allows highly improved computing power that supports 64-bit OS and Bluetooth 4.1. In addition, OP3 is developed under ROS(Robot Operating System) to utilize various packages in ROS ecosystem. All these hardware improvements and ROS support allows developers to focus more on research and development compare to the preceding robots.

OP3 looks quite different from OP2 as default skin is not provided. Users can download design skin files.
Downloaded skin files can be used for 3D printing.
ROBOTIS OP3 is loaded Intel NUC with i3 processor to achieve significant improvement in computing power.
OP3 supports HDMI and Display Port(DP) while OP2 only supports mini HDMI.
There are 1 RGB LED and 3 LEDs, 4 buttons on the back of OP3. From left to right, each button stands for Mode, Start, User, Reset.

Actuator MX-28 XM430-W350
CPU Intel Atom N2600
@1.6GHz dual core
Intel Core i3 processor
dual core
(32GB maximum)
Storage half-size mSATA module (32GB)
M.2 SSD module (128GB)
Compatible OS any Linux release (32-bit)
any Windows release (32-bit)
any Linux release (32-bit/64-bit)
any Windows release (32-bit/64-bit)
Networking Realtek 10/100/1000 Mbps Ethernet
802.11n (2.4GHz-only)
Intel 10/100/1000 Mbps Ethernet
802.11ac (2.4GHz, 5GHz)
Bluetooth 4.1
Camera Logitech C905 (1600x1200) Logitech C920 (1920x1080)

ROBOTIS OP3 is an affordable, miniature humanoid robot platform with advanced computational power, sophisticated sensors, high payload capacity, and dynamic motion ability to enable many exciting research and education activities.

  MX-28 XM430-W350
Weight 77g 82g
Dimension 35.6mm x 50.6mm x 35.5mm 28.5mm x 46.5mm x 34.0mm
Gear Ratio 193 : 1 353.5 : 1
Stall Torque 2.5 N.m 4.1 N.m
Stall Current 1.4 A 2.3 A
No Load Speed 55 RPM 46 RPM
Protocol 1.0 Only 1.0, 2.0
Height About 510mm
Weight About 3.5kg (without skin cover)
DOF 20
Actuator XM430-W350-R
Main Controller INTEL NUC i3
Intel Core i3 processor dual core
128GB M.2 SSD
Sub Controller OpenCR
Camera Logitech C920 HD Pro Webcam
IMU Sensor 3-Axis Gyroscope, 3-Axis Accelerometer, 3-Axis Magnetometer
Battery Lipo 3cell 11.1v 1800mA
IO Device RGB LED x 1, LED x 3 (Red, Green, Blue), Button x 4, Speaker x 1
Installable OS any Linux release (32-bit/64-bit)
any Windows release (32-bit/64-bit)
OS : Linux (64-bit)

Safety Information

CAUTION : ROBOTIS will not be responsible for any loss or damage whatsoever caused resulting from user’s negligence or misuse of the product.

Package Contents

Check your ROBOTIS OP3 package for the following items.

No Item Quantity
1 Fully-assembled ROBOTIS OP3 robot 1
2 USB Thumb Drive (with recovery software) 1
3 Fuse 2
4 Ball 1
5 Quick Start Manual 1
6 Spare Cables 1 pack
7 Loctite 1
8 Wrench & Screw Driver 1 set
9 Power Cable 1
10 DC Power Supply 1
11 Spare Bolts and Nuts 1 pack
12 Ethernet Cable 1
13 Battery Charger 1
14 Battery Pack 3
15 Hard Case 1


CAUTION : Layout of the front and back panel is subject to change depends on the selected built-in PC.

Charging Battery

This section describes how to charge a battery using the provided charger.

Use either of instructions depending on a provided charger.

Using LBC-010

Watch the video and learn how to charge a battery using LBC-010.


Follow the next instruction and learn how to charge a battery using IMAX B6MINI CHARGER.

Battery Hot Swap

The battery of ROBOTIS-OP3 can be replaced without shutting down the robot.
To replace battery during operation, please follow the below procedure.