Build a 6-DOF Arduino Robotic Arm with Web Control

Source: Dev.to

Robotic arms are one of those projects that almost every electronics enthusiast eventually builds. They combine mechanics, electronics, programming, and control systems into one powerful learning experience. In this project we build a 6‑DOF Arduino robotic arm using servo motors, 3D‑printed parts, and a web‑based dashboard for real‑time control. It’s capable of smooth pick‑and‑place operations and can even record and replay motion sequences.

What is a 6‑DOF Arduino Robotic Arm?

A 6‑DOF robotic arm has six independent joints:

• Base rotation
• Shoulder movement
• Elbow movement
• Wrist pitch
• Wrist rotation
• Gripper control

More degrees of freedom mean more flexibility and human‑like motion, allowing precise positioning in 3D space. Servos rotate to specific angles (usually 0–180°) and provide accurate position control. Because multiple servos draw significant current, an external 5 V power supply (2 A or more) is required—USB power alone is insufficient. All servos should be set to 90° before assembly to avoid mechanical limits.

Hardware Components

• Arduino Uno
• 3 × MG995 high‑torque servos
• 3 × MG90S micro servos
• 3D‑printed arm parts
• Breadboard & jumper wires
• External 5 V power supply
• Screws & assembly hardware

Servo Connections

Each servo signal wire connects to an Arduino PWM pin:

All servos share a common external 5 V supply and a common ground (connected to Arduino GND).

Mechanical Assembly Tips

• Check fit after printing.
• Secure servo horns properly.
• Ensure smooth joint rotation.
• Keep wiring clean and stable.

Good mechanical alignment directly improves motion smoothness.

Arduino Program Overview

• Declares six Servo objects.
• Sets all joints to a safe 90° startup position.
• Reads serial commands (e.g., B90, S45).
• Constrains angles between 0–180°.
• Moves servos smoothly using step‑by‑step interpolation.

Smooth motion prevents sudden jerks, current spikes, and mechanical stress.

Web‑Based Control Dashboard

Instead of physical knobs, this project uses a web dashboard built with HTML, CSS, JavaScript, and the Web Serial API. It runs locally in Chrome (no internet required).

Features

• Real‑time slider control
• Reset to default position
• Record movements
• Save motion as JSON
• Replay recorded sequences

Applications

• Pick‑and‑place automation
• Educational robotics demonstrations
• Laboratory sample handling
• Prototype automation systems
• Mechatronics learning

Future Upgrades

• Wireless control (ESP32)
• AI vision integration

Common Issues & Fixes

• Servos jittering? → Power supply likely insufficient.
• Arm not moving? → Check external power and signal wiring.
• Dashboard not working? → Use Chrome (Web Serial supported).
• Arm hitting limits? → Re‑align servos at 90° before mounting.

Final Thoughts

This 6‑DOF Arduino robotic arm is more than just a cool build—it’s a complete hands‑on introduction to robotics. It brings together mechanical design, embedded programming, servo control, power management, and web‑based interfaces. Whether you’re exploring automation, robotics, or embedded systems, this project builds a strong foundation for advanced robotic systems.

Build it. Program it. Record motions. And take your first serious step into robotics.