Project Hub /Basic Analog & Power Electronics/Power Supplies & Voltage Regulators/Assembling the MeArm Robotic Arm

Intermediate

ARDUINO

₹1,500 – ₹5,000

3 – 6 Hours

Partial Kit

Assembling the MeArm Robotic Arm

A comprehensive guide on how to assemble, calibrate, and wire the popular open-source MeArm 4-DOF robotic arm using an Arduino.

Originally published on DroneBot Workshop

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino UNO R3 Board (Compatible) – ATmega328P Microcontroller with USB Cable Rs. 999.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Prototype Kit / Sensor Kit / Starter Kit
Thyristor / SCR / Triac / Varistor / Fuse
permanent marker
2.5mm hex Allen key

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How It Works

The MeArm Robotic Arm is a mechanical structure built from acrylic plates and driven by four MG90S servo motors. Each servo motor contains an internal DC motor, a gearbox, and a potentiometer that acts as a position sensor. By connecting these motors to an Arduino Uno, you can send precise control signals to dictate the exact angle of each joint, allowing the arm to move with four degrees of freedom (4-DOF). Because multiple servo motors draw significant electrical current when moving under load, the system relies on an external 5V power supply rather than pulling power through the Arduino board itself. The Arduino Uno runs code created in the Arduino IDE using the built-in Servo.h library, which generates Pulse Width Modulation (PWM) signals. These PWM signals translate directly into physical movements across the base, shoulder, elbow, and gripper joints of the robotic arm.

Why Build This

Learn the fundamentals of mechanical assembly and robotics by building a physical 4-DOF arm from scratch.

Understand how software code written in the Arduino IDE translates into physical movement using servo motors.

Gain hands-on experience wiring external power supplies to safely handle current demands in electronics projects.

Real-World Application

Used in classrooms and makerspaces to teach robotics, kinematics, and basic automation before scaling up to industrial robotic arms.

Skills You'll Learn

servo motor control

pulse width modulation

mechanical assembly

power distribution

kinematics

Safety Precautions

Always use an external 5V power supply with sufficient current (at least 2A) for the servo motors rather than drawing power directly from the Arduino voltage regulator.

Technology Tags

MEARM

ARDUINO

SERVO MOTORS

MG90S

ACRYLIC ASSEMBLY

ROBOTICS

Frequently Asked Questions

Can I power the servo motors directly from the Arduino Uno 5V pin?

No, you should always use an external 5V power supply with sufficient current (at least 2A). Drawing power for four servo motors directly through the Arduino's onboard regulator can cause voltage drops, erratic behavior, or damage to the board.

What software do I need to program the MeArm?

You need the Arduino IDE installed on your computer, along with the standard Servo.h library to control the MG90S servo motors.

What tools are required to assemble the acrylic plates?

The kit requires a 2.5mm hex Allen key or screwdriver to fasten the acrylic plates and components together securely, along with a permanent marker for marking parts if necessary.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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