Robotics :: Robot Kits :: Robotic Platforms :: RoArm-M2-S

RoArm-M2 series is a 4DOF smart robotic arm designed for innovative applications. Adopts lightweight structure design with a total weight of less than 900g and the effective payload of [email protected], it can be flexibly mounted on various mobile platforms. Adopts a 360°omnidirectional base combined with three flexible joints to create a workspace with a 1-meter diameter.

The joint direct-drive design enhances repositioning precision and also improves structural reliability, with innovative dual-drive technology doubling the shoulder joint torque. Onboard ESP32 MCU main control module supports multiple wireless control modes, provides control interfaces and rich communication protocols for easily connecting to various devices.

Provides a user-friendly and cross-platform Web application that integrates a simple and visualized coordinate control mode, making it easier to get started. Comes with rich graphic and video tutorials to help you learn and use it quickly. Compatible with ROS2 and various host computers, supports various wireless and wired communication modes. Comes with an expansion plate, supports customizing the EoAT (End of Arm Tooling) to meet innovative application requirements.

RoArm-M2 series achieves an excellent balance between lightweight, user-friendliness, expandability, and open innovation, it is a multifunctional robotic arm that integrates intelligent control, human-machine interaction, and customizable development. Ideal for applications that require a combination of flexibility, expandability, and user-friendliness.

Multiple EoAT mounting methods: The EoAT supports various mounting methods, can be used as a clamp or as the fourth degree of freedom. Provides Open-source DXF and 3D models for DIY and secondary development.

Flexible joints: Adopts 360° rotation base and flexible joints to create an omnidirectional operating space with a 1-meter diameter, allowing the EoAT to move freely in all directions.

Easy to control via cross-platform Web application: No App installation required, access after entering the address. Allows users to connect and control RoArm-M2 via mobile phones, tablets and computers by clicking the buttons on the Web App. Supports secondary development of this open-source Web App to customize the user interface and add new functions.

Completely open source for secondary development: Completely open source for the control codes and communication interface documents of Roarm-M2 series, supports multiple languages and devices for secondary development. Provides modularized demos and tutorials for zero-based users, easy to get started.
Lightweight body, excellent load capacity: Lightweight body with a total weight of less than 900g, adopts carbon fiber and 5052 aluminum alloy to ensure stability under heavy loads, suitable for various mobile robot chassis.

Feedback precision up to 0.088°: The joint angle feedback can be obtained directly via a 12-bit high-precision magnetic encoder without any reduction groups, which is more accurate, and the actual position of the current target point can be calculated based on the joint angle feedback.
Innovative dual-drive technology doubles the shoulder joint torque: A dual-drive control algorithm allows the two servos at the shoulder joint to coordinate their output torque effectively, significantly enhancing the power and the overall load capacity of RoArm-M2 Series.
Direct-drive clamp enables precise force control: The direct-drive clamp design allows precise control of the clamp force in the program, suitable for clamping delicate objects without applying excessive force.

Supports installing rubber bands to compensate for the influence of gravity: The SHOULDER and ELBOW joints support installing the rubber bands to assist the robotic arm, by utilizing the elastic contraction of rubber bands to compensate for the influence of gravity and increase the effective load of the robotic arm.
Dynamic external force adaptive control: After enabling this function, you can limit the maximum torque for each joint. When the external force applied to the joint exceeds the torque threshold (configurable), the robotic arm will rotate in response to the external force, and will return to the specified position when the external force decreases below the torque threshold.
One-click automatic recording: RoArm-M2 can save JSON instructions for robot control as task files. The task files can be saved in the Flash of ESP32, which will not be lost in case of power loss. The robotic arm can perform complex and repetitive operations by calling these task files.
Accurately reach the target by entering the coordinates: Open source for inverse kinematics control algorithm in the three-dimensional Cartesian coordinate system. After entering the target position, the robot arm can accurately reach the target point by using the inverse kinematics function to calculate the rotation angle of each joint.
Curve velocity control for smoother movement: Curve velocity control algorithm make the robotic arm move smoother and more naturally, without oscillations during start and stop.
ESP-NOW wireless control - Low-delay remote collaboration: ESP-NOW is a low-delay ad hoc wireless communication protocol, without the need of Network infrastructures. You can use one robotic arm to wirelessly control other robotic arms, and the control methods can be set as broadcast control, group control, and one-to-one control.

Supports Leading-following control mode based on ESP-NOW: In the Leading-following control mode, the Leader robotic arm will send its joint angle information to other robotic arms via ESP-NOW communication. The other robotic arms which are in ESP-NOW Follower mode will imitate the same actions as the Leader in real time.
Multiple control interfaces, multiple devices and languages support: RoArm-M2 series can be controlled not only by the Web application, but also supports using other controllers to send JSON commands via HTTP protocol network request, serial communication, or USB communication for controlling and obtaining feedback.
Multiple installation methods for Integrating into your application: Provides multiple installation schemes and related secondary development resources, suitable for different usage scenarios and can be flexibly integrated into your projects and applications.

Easy to install different peripherals: The main structure of the upper arm adopts two 1020 European standard aluminum rails, supports installing additional peripherals via the boat nuts to meet different needs. Comes with boat nuts and corresponding M4 screws for easy installation.

Supports installing a camera to extend visual applications: Comes with a camera holder and open source for the related drawings. You can directly install a camera with the corresponding size or other cameras with an adapter.

Supports expanding different EoAT for more functions: Comes with an expansion plate, easy for users to expand and replace different EoAT for more functions.

Onboard ESP32 main control board: Adopts ESP32 powerful main control MCU, supports Multiple wireless communication protocols, with a large amount of open source resources to help secondary development of innovative applications.
Compatible with ROS2: Provides model establishment file and supports multi-device cooperation. Provides communication nodes of ROS2, URDF model description file and zero-based tutorial of ROS2.
Rich tutorial resources for secondary development: Complete unit tutorials and cases are provided, including various functions and common application scenarios, to help users get started quickly for secondary development.
Diversified onboard resources: Integrated TB6612FNG motor drive IC, INA219 battery voltage monitoring, and 9-axis IMU sensor, supports function expansion and innovation.

Mouse drag-and-drop interaction: Provides Web applications and desktop software (open-source programs developed by Python), supports setting action instructions when the mouse is pressed and released to control the robotic arm flexibly.

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Technical data

DOF	4
Work space	Horizontal diameter: 1090mm (Max, 360° omnidirectional), Vertical: 798mm (Max)
Operating voltage	12V 5A power supply, supports 3S Lithium batteries (NOT included)
Load capacity	[email protected]
repositioning precision	≈±4mm (under the same load)
Servo rotation speed	40rpm (no-load, no torque limit)
Operating range	BASE-360°, SHOULDER-180°, ELBOW-180°, HAND-135°/270°
Drive type	TTL Serial bus servo, direct-drive joint
Servo numbers	5
Joint angle sensor	12-bit 360° magnetic encoder
Servo torque	30kg.cm@12V
Joint feedback information	servo status, joint angle, rotation speed, joint load, servo voltage, servo current, servo temperature and servo working mode
Main control	ESP32-WROOM-32
Main control module features	WiFi, BT, Dual Core, 240MHz
Wireless control mode	2.4G-WiFi, ESP-NOW
Wired control mode	USB, UART
Manual operation mode	Web control interface
Host operation mode	UART/USB/ESP-NOW/HTTP communication via JSON data format commands ( it does not support obtaining feedback information if using ESP-NOW communication)
Host support	USB connection devices including Raspberry Pi, Jetson Orin Nano, and PC.
EoAT function	Clamp function by default, can be changed as an additional degree of freedom
LED power	≤1.5W
OLED screen size	0.91inch
Other functions	2-ch 12V power supply switch, 9-DOF IMU
Robotic arm weight	RoArm-M2-S: 826 ±15g (not including the table edge fixing clamp)
table edge fixing clamp weight	290g ±10g
Supported table edge thickness of the clamp	<72mm
Demo	3D Cartesian coordinate system control (inverse kinematics control); Dynamic external force adaptive control; Joint angle control; Operating information feedback; FLASH files system operation; Steps recording and replaying; ESP-NOW control; Leading-Following mode (Hand guiding control); LED control; 12V power supply ON/OFF control; WiFi function settings; Set startup tasks; Serial bus servo settings; Feedback mode setting; EoAT mode setting, etc. (Note: Please refer to the WIKI for more details)

Included in the package

General Driver Board for Robots

1. ESP32-WROOM-32 controller module - Can be developed using Arduino IDE
2. IPEX1 WIFI connector - For connecting WIFI antenna to increase the wireless communication distance
3. LIDAR interface - Integrated radar adapter function
4. I2C peripheral expansion interface - For connecting with OLED screen or other I2C sensors
5. Reset Button - Press and release to reboot the ESP32
6. Download button - The ESP32 will enter the download mode after powering on
7. DC-DC 5V voltage regulator circuit - Power supply for host computers such as Raspberry Pi or Jetson nano
8. Type-C port (LADAR) - LIDAR data transmission
9. Type-C port (USB) - ESP32 communication interface, for uploading programs to ESP32
10. XH2.54 power port - Support DC 7~13V input, can directly power the serial bus servos and motors
11. INA219 - voltage/current monitoring chip
12. Power ON/OFF - External power supply ON/OFF
13. ST3215 serial bus servo interface - For connecting with ST3215 serial bus servo
14. Motor interface PH2.0 6P - Group B interface for motor with encoder
15. Motor interface PH2.0 6P - Group A interface for motor with encoder
16. Motor interface PH2.0 2P - Group A interface for motor without encoder
17. Motor interface PH2.0 2P - Group B interface for motor without encoder
18. AK09918C - 3-axis electronic compass
19. QMI8658C - 6-axis motion sensor
20. TB6612FNG - Motor Control Chip
21. Serial bus servo control circuit - For controlling multiple ST3215 serial bus servos and obtaining servos feedback
22. TF card slot - Can be used to store logs or WIFI configurations
23. 40PIN GPIO header - For connecting with Raspberry Pi or other host boards
24. 40PIN extended header - Easy to use the GPIO pins of Raspberry Pi or other host boards
25. CP-2102 - UART to USB, for radar data transmission
26. CP-2102 - UART to USB, for ESP32 communication
27. Automatic download circuit - For Uploading programs to the ESP32 without pressing the EN and BOOT buttons

VIDEO

Waveshare RoArm-M2-S - Desktop Robotic Arm Kit

RoArm-M2-S - Desktop 4-DOF Robotic Arm Kit

Technical data

Included in the package

General Driver Board for Robots