High-torque ESP32 4-DOF RoArm-M2-S Desktop Robotic Arm Kit

The High-torque ESP32 4-DOF RoArm-M2-S Desktop Robotic Arm Kit is a highly versatile, lightweight robotic arm designed for advanced development and hands-on learning. Built on the powerful ESP32 MCU, it is ideal for students, educators, makers, and ROS2 developers looking to explore intelligent control, inverse kinematics, and custom end-of-arm tooling.

Omnidirectional workspace and lightweight build

Weighing under 850g, the arm features a carbon fibre and 5052 aluminium alloy construction capable of handling a 0.5kg payload at a 0.5-metre range. Its 360-degree rotating base combined with three flexible joints creates an expansive 1-metre diameter operating space.

Dual-drive shoulder joint technology

To significantly enhance lifting power, the arm utilises an innovative dual-drive control algorithm that coordinates two serial bus servos at the shoulder joint. This effectively doubles the joint's output torque, improving the overall payload capacity and stability under load.

High-precision direct-drive joints

Direct-drive joints eliminate reduction gear groups to deliver feedback precision up to 0.088 degrees via integrated 12-bit magnetic encoders. This allows the system to calculate the exact real-time position of the arm and ensures highly accurate target positioning.

Precise clamp force control

The direct-drive clamp design allows users to programmatically regulate the gripping force. This precise control makes it possible to safely handle delicate objects without applying excessive pressure.

Gravity compensation with rubber bands

The shoulder and elbow joints support the installation of rubber bands to assist the servos. By utilising elastic contraction to compensate for gravity, the arm can achieve an increased effective load capacity.

Cross-platform web control application

An intuitive, cross-platform web application allows you to control the robotic arm via mobile phones, tablets, or computers without installing any apps. The open-source interface supports co-ordinate control and can be fully customised to add new functions.

Low-latency ESP-NOW wireless control

Utilising the low-delay ESP-NOW protocol, the arm supports leading-following, broadcast, and group control modes without needing local network infrastructure. This enables seamless remote collaboration and multi-device synchronisation.

Co-ordinate-based inverse kinematics

With its open-source inverse kinematics algorithm, the arm accurately reaches target points in a 3D Cartesian co-ordinate system. Users can also record complex, repetitive paths and save them directly to the ESP32's flash memory.