Collection: Servo Motor Robot Arms

Overview

Our servo robot arm collection covers every kit in our catalog that uses PWM servo motors as the primary actuators. Servo motors are the most approachable motor type for Arduino projects — a single PWM signal on any digital pin controls position from 0° to 180° with no additional driver hardware. Kits start from $23 and span 1 to 7 DOF.

Servo Motor Control for Robot Arms

Servo motors in robot arm kits receive a 50Hz PWM signal where pulse width determines the output shaft angle: 1ms = 0°, 1.5ms = 90°, 2ms = 180°. Arduino's Servo.h library abstracts this to a simple servo.write(angle) call. MG996R servos deliver 11–13 kg/cm of torque at 6V — sufficient for shoulder and elbow joints. SG90 micro servos at 1.8 kg/cm are used for lighter wrist and finger joints. The A0090 servo (used in robot hand kits) sits between the two in torque and size.

Which Servo Arm Should You Choose?

• 1–2 DOF (Gripper, Pan-Tilt): Single servo projects, great for first builds and camera rigs
• 4 DOF (STEM Kit): The sweet spot for beginners — meaningful arm movement, simple wiring
• 5 DOF (Robot Hand): Finger-level dexterity, excellent for prosthetics and gesture research
• 6–7 DOF: Full spatial coverage, inverse kinematics, professional applications

Related Collections

Also explore: Arduino Robot Arms, 6 DOF Arms, and Robot Hands.

Shipping & Returns

Free US shipping on orders over $49. Ships 1–3 business days. 30-day guarantee.