• 4 DOF STEM Robot Arm Kit - Complete Kit
  • 4 DOF STEM Robot Arm Kit - Assembly Components
  • 4 DOF STEM Robot Arm Kit - Assembled View
  • 4 DOF STEM Robot Arm Kit - Joint Detail
  • 4 DOF STEM Robot Arm Kit - Servo Motor Close-up
  • 4 DOF STEM Robot Arm Kit - Side View
  • 4 DOF STEM Robot Arm Kit - Gripper Detail
  • 4 DOF STEM Robot Arm Kit - Size Reference
  • 4 DOF STEM Robot Arm Kit - Complete Kit
  • 4 DOF STEM Robot Arm Kit - Assembly Components
  • 4 DOF STEM Robot Arm Kit - Assembled View
  • 4 DOF STEM Robot Arm Kit - Joint Detail
  • 4 DOF STEM Robot Arm Kit - Servo Motor Close-up
  • 4 DOF STEM Robot Arm Kit - Side View
  • 4 DOF STEM Robot Arm Kit - Gripper Detail
  • 4 DOF STEM Robot Arm Kit - Size Reference
  • 4 DOF STEM Robot Arm Kit - Complete Kit
  • 4 DOF STEM Robot Arm Kit - Assembly Components
  • 4 DOF STEM Robot Arm Kit - Assembled View
  • 4 DOF STEM Robot Arm Kit - Joint Detail
  • 4 DOF STEM Robot Arm Kit - Servo Motor Close-up
  • 4 DOF STEM Robot Arm Kit - Side View
  • 4 DOF STEM Robot Arm Kit - Gripper Detail
  • 4 DOF STEM Robot Arm Kit - Size Reference
  • 4 DOF STEM Robot Arm Kit - Complete Kit
  • 4 DOF STEM Robot Arm Kit - Assembly Components

4 DOF STEM Robot Arm Kit - Beginner DIY with SG90 Servo

4 DOF STEM Robot Arm Kit - Beginner DIY with SG90 Servo

$23.95
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Overview

The perfect first robot arm. This 4-DOF kit uses SG90 micro servos for safe, low-power operation that is ideal for young builders and STEM classrooms. Four degrees of freedom provide enough complexity to learn real robotics concepts while keeping assembly manageable for ages 10+.

⚡ Safety Notice

Contains small screws and nuts. Recommended for ages 10+ with adult supervision for younger children. SG90 servos are low-torque and safe, but keep fingers clear of gripper during operation.

Key Features

  • Beginner-Friendly — Designed for first-time builders ages 10+
  • SG90 Micro Servos — Low-power, safe operation for young makers
  • 4 Degrees of Freedom — Base, shoulder, elbow, and gripper
  • STEM Focused — Teaches servo control, kinematics basics, and programming
  • Budget-Friendly — Most affordable robot arm in our lineup
  • Arduino Compatible — Standard servo signals from any microcontroller

Technical Specifications

DOF 4 (base + shoulder + elbow + gripper)
Material Acrylic + Metal hardware
Motor 4x SG90 Micro Servo (1.8kg/cm)
Reach ~200mm
Payload ~50-100g
Weight ~150g
Voltage 5V DC
Compatibility Arduino, RPi, micro:bit

Quick Start Code

// STEM Robot Arm — Arduino Quick Start #include <Servo.h> Servo joint1; Servo joint2; Servo joint3; // ... 4 servos total void setup() { joint1.attach(9); joint2.attach(10); joint3.attach(11); } void loop() { joint1.write(90); // Center position delay(1000); joint1.write(45); // Move to 45° delay(1000); }

Package Contents

  • Arm frame parts (acrylic + hardware)
  • 4x SG90 micro servo motors
  • Mounting screws and nuts
  • Servo horns
  • Assembly guide with diagrams

Who Is This For?

The ideal starter kit for kids ages 10+, STEM classrooms, parents looking for educational gifts, science fair projects, and complete beginners who want an affordable first robotics project.

Shipping & Returns

Free US shipping on orders over $49. All orders ship within 1-3 business days with full tracking. International shipping available to Canada, Australia, New Zealand, and Europe. 30-day money-back guarantee on all kits.

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Technical Specifications

See product description above for full specs.

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What's in the Box

See product description above for complete parts list.

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Shipping & Returns

Free US shipping on orders over $49. All orders ship within 1-3 business days with full tracking. International shipping available to Canada, Australia, New Zealand, and Europe. Not satisfied? Return unused items within 30 days for a full refund.

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    4 DOF STEM Robot Arm Kit - Beginner DIY with SG90 Servo

    $23.95
    $23.95 $23.95
    SAVE 0% Sold out
    View full details

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    CNC-machined aluminum alloy — not plastic

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    Works with Arduino, RPi, and ESP32

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    No questions asked money-back guarantee

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    Do I need prior experience to build this?

    Most of our kits include step-by-step assembly instructions. Beginner kits (1-4 DOF) require no prior experience. Advanced kits (6-7 DOF) benefit from basic electronics knowledge.

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    Is an Arduino board included?

    Arduino boards are included with select variants. Check the variant options on each product page. All kits are compatible with Arduino Uno, Mega, and Nano.

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    How long does assembly take?

    Beginner kits: 1-2 hours. Mid-range kits: 2-4 hours. Advanced/professional kits: 4-8 hours. This is part of the learning experience!

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    What tools do I need?

    Most kits include the necessary hardware. You may need a small Phillips screwdriver and hex wrench set (often included). A soldering iron is NOT required for most kits.

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    Can I return it if I cannot build it?

    Yes! We offer a 30-day money-back guarantee on all kits. If you are not satisfied for any reason, contact us for a full refund.