A Lightweight, Capable Robotic Arm for Makers and Engineer
Model: LinkArm_LT
- LinkArm LT is a lightweight robotic arm for makers, education, and engineering experiments.
- Its parallel-link structure, driven by four high-torque bus servos, delivers smooth motion and strong expandability.
- Based on an ESP32-S3 controller, it features onboard inverse kinematics and motion interpolation, and supports USB CDC, WebSocket, HTTP, and ESP-NOW communication.
- The arm can be controlled using JSON commands from desktop software, web applications, or scripts, enabling fast and flexible development.
Inverse Kinematics & Motion Interpolation
Simplifies motion control while maintaining precision and stability.
Web App & JSON commands
Extend, iterate, and integrate with ease.
Lightweight Structure & Stable Power
- Designed for both desktop setups and mobile platforms, LinkArm LT adapts easily to a wide range of practical applications.
- Its parallelogram linkage structure is well suited for mounting on mobile bases. In the event of impact, mechanical components help distribute forces, providing added protection to the joints.
- Driven by four 15 kg·cm high-torque bus servos, the arm offers convenient control, real-time joint feedback, and built-in overload protection.
- A total of 19 precision bearings assist the linkage motion, ensuring smoother rotation and fluid movement.
On Desktop
On Mobile Platform (Client Cases)
Practical functions
Working Range
- Covers the typical operating radius required by most projects
- Maximum arm reach: 330 mm
- Base rotation angle: 180°
Payload Capacity
- Supports up to 1 kg payload when handling objects close to the base
- When mounted on a mobile chassis, it can pick up heavy objects from the ground or help self-right an overturned platform
Zero-Learning Curve
Power on → open a browser → control the arm instantly
- Built-in, cross-platform web-based control interface
- Automatically creates a Wi-Fi hotspot on startup
- Supports AP + STA modes
- No software installation, no programming required
- One-click joint control via the web interface
- Motion sequences can be recorded directly in the browser
Script Control & Project Integration
Communication Methods
Communication Methods
Communication Methods
- Wireless communication: WebSocket, HTTP, ESP-NOW
- Wired communication: USB-CDC, UART
Project Integration
Communication Methods
Communication Methods
- Designed for advanced development and system integration
- LinkArm LT supports flexible control methods for engineering and automation projects.
Standard Data Format
Communication Methods
Standard Data Format
- Control via JSON-formatted commands, human-readable and easy to debug
- Python host-side example code provided for all supported communication methods
Built-In Inverse Kinematics & Motion Planning
- All kinematic calculations are performed on the robotic arm, with no complex algorithms required on the host side
- Integrated inverse kinematics solver for automatic joint angle calculation
- Simply input the end-effector target position to generate motion
- Built-in smooth start/stop interpolation algorithms
- Send a single target point and the arm automatically plans the motion path
- Delivers smoother movement while reducing host computing load
User Interface Board
Provides a more intuitive way to interact with the robotic arm
- OLED display for real-time status information
- Five-way navigation button for mode switching and parameter viewing
TTL Node Board
Flexible expansion for your robotic system
- S.BUS input with support for RC control
- Dual onboard RGB status indicators
- Dual adjustable power outputs for powering external devices
- Servo bus debugging interface via USB Type-C, compatible with Feetech servo configuration software
Control Module
Feature-rich and open hardware platform
- Powered by Robot Driver with ESP32-S3 Lite
- Native wireless communication support with a mature development ecosystem
Plug-and-Play Host Expansion
Simply connect to a host computer via USB
- Control the robotic arm using simple Python scripts on the host
- Enables more advanced application scenarios with minimal setup
Wireless Control
For Wi-Fi–enabled hosts, the arm can be remotely controlled via HTTP requests or WebSocket
- Python example code is provided for quick integration
- Jetson and Raspberry Pi users can refer to tutorials labeled “Linux” for platform-specific guidance
Easy Integration
Comprehensive assembly documentation is provided, making it easy to integrate the robotic arm into your own projects
Open-Source Chassis
Downloadable open-source chassis designs are available on our official website
- Released under the MIT License, allowing free use and modification in your own projects
- The arm shown in the image is in a folded position, reducing the overall height of the platform
