{"product_id":"sg90-mg90s-stem-4-dof-robot-arm-kit-mechanical-arm-claw-kit-ps2-or-knob-control-for-arduino-robot-arm-kit-diy-programming-robot","title":"4 DOF STEM Robot Arm Kit - Beginner DIY with SG90 Servo","description":"\u003cdiv class=\"product-description\"\u003e\n\n\u003cp class=\"labos-section-title\"\u003eOverview\u003c\/p\u003e\n\u003cp\u003eThe 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+.\u003c\/p\u003e\n\n\u003cdiv class=\"labos-alert\"\u003e\n  \u003cdiv class=\"alert-header\"\u003e⚡ Safety Notice\u003c\/div\u003e\n  \u003cp\u003eContains 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"labos-section-title\"\u003eKey Features\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBeginner-Friendly\u003c\/strong\u003e — Designed for first-time builders ages 10+\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSG90 Micro Servos\u003c\/strong\u003e — Low-power, safe operation for young makers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 Degrees of Freedom\u003c\/strong\u003e — Base, shoulder, elbow, and gripper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSTEM Focused\u003c\/strong\u003e — Teaches servo control, kinematics basics, and programming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBudget-Friendly\u003c\/strong\u003e — Most affordable robot arm in our lineup\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArduino Compatible\u003c\/strong\u003e — Standard servo signals from any microcontroller\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp class=\"labos-section-title\"\u003eTechnical Specifications\u003c\/p\u003e\n\u003ctable class=\"labos-specs\"\u003e\n  \u003ctr\u003e\n\u003cth\u003eDOF\u003c\/th\u003e\n\u003ctd\u003e4 (base + shoulder + elbow + gripper)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAcrylic + Metal hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eMotor\u003c\/th\u003e\n\u003ctd\u003e4x SG90 Micro Servo (1.8kg\/cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eReach\u003c\/th\u003e\n\u003ctd\u003e~200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003ePayload\u003c\/th\u003e\n\u003ctd\u003e~50-100g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e~150g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003ctd\u003eArduino, RPi, micro:bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp class=\"labos-section-title\"\u003eQuick Start Code\u003c\/p\u003e\n\u003cdiv class=\"labos-code\"\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"cm\"\u003e\/\/ STEM Robot Arm — Arduino Quick Start\u003c\/span\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"pp\"\u003e#include\u003c\/span\u003e \u003cspan class=\"str\"\u003e\u0026lt;Servo.h\u0026gt;\u003c\/span\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"kw\"\u003eServo\u003c\/span\u003e joint1;\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"kw\"\u003eServo\u003c\/span\u003e joint2;\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"kw\"\u003eServo\u003c\/span\u003e joint3;\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"cm\"\u003e\/\/ ... 4 servos total\u003c\/span\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"kw\"\u003evoid\u003c\/span\u003e \u003cspan class=\"fn\"\u003esetup\u003c\/span\u003e() {\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  joint1.\u003cspan class=\"fn\"\u003eattach\u003c\/span\u003e(\u003cspan class=\"num\"\u003e9\u003c\/span\u003e);\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  joint2.\u003cspan class=\"fn\"\u003eattach\u003c\/span\u003e(\u003cspan class=\"num\"\u003e10\u003c\/span\u003e);\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  joint3.\u003cspan class=\"fn\"\u003eattach\u003c\/span\u003e(\u003cspan class=\"num\"\u003e11\u003c\/span\u003e);\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e}\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e\u003cspan class=\"kw\"\u003evoid\u003c\/span\u003e \u003cspan class=\"fn\"\u003eloop\u003c\/span\u003e() {\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  joint1.\u003cspan class=\"fn\"\u003ewrite\u003c\/span\u003e(\u003cspan class=\"num\"\u003e90\u003c\/span\u003e);  \u003cspan class=\"cm\"\u003e\/\/ Center position\u003c\/span\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  \u003cspan class=\"fn\"\u003edelay\u003c\/span\u003e(\u003cspan class=\"num\"\u003e1000\u003c\/span\u003e);\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  joint1.\u003cspan class=\"fn\"\u003ewrite\u003c\/span\u003e(\u003cspan class=\"num\"\u003e45\u003c\/span\u003e);  \u003cspan class=\"cm\"\u003e\/\/ Move to 45°\u003c\/span\u003e\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e  \u003cspan class=\"fn\"\u003edelay\u003c\/span\u003e(\u003cspan class=\"num\"\u003e1000\u003c\/span\u003e);\u003c\/span\u003e\n\u003cspan class=\"line\"\u003e}\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"labos-section-title\"\u003ePackage Contents\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eArm frame parts (acrylic + hardware)\u003c\/li\u003e\n  \u003cli\u003e4x SG90 micro servo motors\u003c\/li\u003e\n  \u003cli\u003eMounting screws and nuts\u003c\/li\u003e\n  \u003cli\u003eServo horns\u003c\/li\u003e\n  \u003cli\u003eAssembly guide with diagrams\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp class=\"labos-section-title\"\u003eWho Is This For?\u003c\/p\u003e\n\u003cp\u003eThe ideal starter kit for \u003cstrong\u003ekids ages 10+\u003c\/strong\u003e, \u003cstrong\u003eSTEM classrooms\u003c\/strong\u003e, \u003cstrong\u003eparents\u003c\/strong\u003e looking for educational gifts, \u003cstrong\u003escience fair projects\u003c\/strong\u003e, and \u003cstrong\u003ecomplete beginners\u003c\/strong\u003e who want an affordable first robotics project.\u003c\/p\u003e\n\n\u003cp class=\"labos-section-title\"\u003eShipping \u0026amp; Returns\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFree US shipping\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"DIY Robotic Arm","offers":[{"title":"frame with 4 sg90 \/ China Mainland","offer_id":62532354965875,"sku":"1005005607324018-frame with 4 sg90-China Mainland","price":23.95,"currency_code":"USD","in_stock":true},{"title":"Knob control set \/ China Mainland","offer_id":62532354998643,"sku":"1005005607324018-Knob control set-China Mainland","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Ps2 control set \/ China Mainland","offer_id":62532355031411,"sku":"1005005607324018-Ps2 control set-China Mainland","price":51.95,"currency_code":"USD","in_stock":true},{"title":"Robotic arm frame \/ China Mainland","offer_id":62532355064179,"sku":"1005005607324018-Robotic arm frame-China Mainland","price":14.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0979\/3408\/2419\/files\/S9f4ab0fc8e6641c69cca6c133f4469efF.webp?v=1770829901","url":"https:\/\/diyroboticarm.com\/products\/sg90-mg90s-stem-4-dof-robot-arm-kit-mechanical-arm-claw-kit-ps2-or-knob-control-for-arduino-robot-arm-kit-diy-programming-robot","provider":"DIY Robotic Arm","version":"1.0","type":"link"}