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Servo Motors & Controllers for Robotics and DIY

Q: 3. How Much Torque Does My Servo Need?

Calculate the required torque using Torque = Load × Distance. For example, a 500 g load positioned 10 cm from the shaft requires approximately 5 kg-cm of static torque. Select a higher-rated servo to account for the mechanism's weight and movement.

Q: 8. Which Servo Motor Is Best for Arduino Beginners?

The SG90 micro servo motor is a popular choice for Arduino beginners because it is compact, affordable, and simple to control using standard PWM signals. It works well for basic robotics, pan-tilt mechanisms, and automation projects.

Explore Different Servo Motors Controllers for DIY Builds

Choose the right servo motor based on torque, voltage, size, and application. Popular models include SG90, MG90S, MG995, and MG996R. The SG90 suits lightweight mechanisms and beginner projects, while the MG90S offers improved durability with metal gears. For higher-torque applications such as robotic arms, grippers, and steering systems, MG995 and MG996R are commonly used. When selecting a servo motor controller, check channel count, voltage compatibility, control signals, and power requirements for your Arduino, Raspberry Pi, or robotics project.

Servo Motor

A servo motor is a precision actuator used to control angular position, speed, or torque. It combines a motor, feedback mechanism, and control circuitry to move to a defined position. Most hobby servos are controlled using a PWM signal, allowing a controller to set the required position.

Servo motors are widely used in robotics, automation, RC vehicles, camera mounts, robotic arms, grippers, and other motion-control applications. The required servo depends on factors such as torque, operating voltage, speed, size, gear material, and rotation type.

Popular models include SG90, MG90S, MG995, and MG996R. The SG90 is suitable for lightweight mechanisms and beginner projects, while the MG90S provides a compact metal-geared option. MG995 and MG996R are better suited to applications requiring higher torque.

Popular Servo Motor Comparison

Servo Motor	Typical Torque	Gear Type	Rotation	Suitable Applications
SG90	~1.5–2.0 kg-cm	Plastic	Positional	Small robots, pan-tilt systems, educational projects
MG90S	~1.8–2.2 kg-cm	Metal	Positional	Compact robotics, RC models, small mechanisms
MG995	~10–12 kg-cm	Metal	Positional / model-dependent	Robotic arms, steering, larger mechanisms
MG996R	~10–12 kg-cm	Metal	Positional	Robot joints, grippers, RC applications

Exact torque, speed, voltage, and rotation specifications can vary between manufacturers and individual variants. Always check the product specifications before selecting a servo for a load-bearing application.

Servo Selection Guide: Torque, Size & Specifications

Torque Rating

Torque is one of the most important specifications when selecting a servo. It indicates how much rotational force the servo can produce at a specified distance from its shaft.

For example, a servo rated at 2 kg-cm can theoretically produce 2 kg of force at a 1 cm lever arm, or approximately 1 kg at a 2 cm lever arm. The actual usable load should remain below the rated limit to account for mechanical losses and dynamic loads.

Servo Torque Worked Example

Consider a robotic arm that needs to lift a 500 g load at a distance of 10 cm from the servo shaft.

The approximate static torque requirement is:

Torque = Load × Distance

Torque = 0.5 kg × 10 cm = 5 kg-cm

A servo rated at exactly 5 kg-cm would not be an ideal choice because the calculation only considers the static load. The arm's own weight, acceleration, friction, and sudden movements can increase the actual torque requirement.

A practical design should therefore select a servo with a higher torque rating, such as 8–10 kg-cm or more, depending on the mechanism and operating conditions.

For load-bearing mechanisms, use the servo's rated or working torque rather than relying only on stall torque.

Size / Form Factor

Servo size affects both the available torque and the space required for installation.

Micro servos: Compact and lightweight, suitable for small mechanisms and lightweight robotics.
Standard servos: Suitable for general-purpose robotics, RC models, and medium-sized mechanisms.
High-torque servos: Designed for heavier loads such as robotic joints, grippers, and mechanical arms.
Nano servos: Useful where size and weight are critical, including miniature robotics and compact mechanisms.

Speed

Servo speed indicates how quickly the shaft moves through a specified angle, commonly measured as the time required to rotate 60°.

Higher-speed servos are useful for applications requiring quick movement, such as RC steering, pan-tilt mechanisms, and animatronics. Torque and speed should be considered together because a very fast servo may not provide enough torque for a heavy mechanism.

Voltage and Current

Check the servo's operating voltage before connecting it to a power source. Current consumption can increase significantly when the servo is under load or approaching stall.

For multiple or high-torque servos, use an appropriately rated external power supply rather than relying on the controller board's 5V output.

Metal vs Plastic Gears

Metal gears provide better durability and are generally preferred for higher-load applications. Plastic gears are lighter and can be suitable for small mechanisms where the applied load is low.

Continuous Rotation vs Positional Servos

Positional servos move to a defined angular position and are commonly used for robotic joints, grippers, steering mechanisms, and pan-tilt systems.

Continuous-rotation servos rotate continuously in either direction, with the control signal determining direction and speed. They are useful when servo-style control is required for wheel or drive mechanisms.

Controller and Channel Count

Projects using multiple servos may require a dedicated PWM servo controller. Check the number of available channels, operating voltage, control interface, and current requirements before selecting a controller.

Code Example for Servo Control

Arduino Code

#include <Servo.h>

Servo myServo;
const int servoPin = 9;

void setup() {
  myServo.attach(servoPin);
}

void loop() {
  myServo.write(0);
  delay(1000);

  myServo.write(90);
  delay(1000);

  myServo.write(180);
  delay(1000);
}

This example moves a positional servo between 0°, 90°, and 180°. The actual usable angle depends on the servo model and its mechanical limits.

Raspberry Pi

from gpiozero import Servo
from time import sleep

servo = Servo(17)

while True:
    servo.min()
    sleep(1)

    servo.mid()
    sleep(1)

    servo.max()
    sleep(1)

A Raspberry Pi can control a servo through a suitable GPIO/PWM interface, but the servo should generally receive power from an appropriate external supply rather than directly from the GPIO pins.

Creative DIY Projects: Robotic Arms, Animatronics & RC Cars

Servo motors are useful wherever controlled mechanical movement is required.

Project	Servo Application
Robotic Arm	Base, shoulder, elbow, wrist, and gripper movement
Animatronic Robot	Facial features, jaw, eyelids, and mechanical movements
RC Car	Steering mechanism and controlled actuation
Camera Pan-Tilt	Horizontal and vertical camera positioning
Automated Door or Flap	Opening and closing mechanisms
Robotic Gripper	Controlled gripping and release

A robotic arm may require several servos with different torque ratings because each joint experiences a different load. The shoulder joint, for example, generally requires more torque than a lightweight gripper.

Beginner Tips: Wiring & PWM Control

Connect servo VCC to a suitable power supply based on the servo's rated voltage.
Connect the servo ground to the controller ground.
Connect the signal wire to the appropriate PWM-capable or servo-control pin.
Use an external power supply for high-load or multiple-servo applications.
Do not power multiple high-current servos directly from an Arduino 5V rail.
Keep the controller and external servo supply grounds connected.
Check the servo's angle limits before commanding extreme positions.
Avoid forcing the servo against a mechanical stop.
Use small angle steps when smoother movement is required.
Add suitable power decoupling where servo current spikes cause controller resets or jitter.

Servo Motor Price in India

The servo motor price depends on the model, torque rating, gear material, size, speed, and additional features.

Basic micro servos such as the SG90 are generally suitable for lightweight and educational projects. Metal-geared models such as the MG90S, MG995, and MG996R are more appropriate when greater durability or torque is required.

Product	Approx. Price
SG90 Micro Servo Motor	₹104
MG995 Servo Motor	₹249
Servo Motor Tester	₹99
MG90S Servo Motor	₹179
Servo Motor Pan-Tilt Setup	₹109

Compare the servo motor price with torque, speed, gear construction, voltage, and intended application rather than selecting solely by cost. A higher-priced servo may be more suitable when the project requires greater load capacity or durability.

Explore other categories

Popular Searches

1. What Is a Servo Motor?

A servo motor is an actuator designed for controlled movement and precise positioning. It uses a motor, gearing, control circuitry, and feedback mechanism to move the shaft to a desired position.

2. What Is the Difference Between a Servo Motor and a DC Motor?

A servo motor provides controlled positioning using feedback, while a standard DC motor primarily provides continuous rotation. Servos are commonly used for robotic arms, grippers, steering, and mechanisms requiring controlled angular movement.

3. How Much Torque Does My Servo Need?

Calculate the required torque using Torque = Load × Distance. For example, a 500 g load positioned 10 cm from the shaft requires approximately 5 kg-cm of static torque. Select a higher-rated servo to account for the mechanism's weight and movement.

4. Can Servo Motors Rotate 360 Degrees?

It depends on the servo type. Standard positional servos typically operate within a defined angular range, while continuous-rotation servos can rotate continuously. Check the specific model's rotation specification before purchasing.

5. How Are Servo Motors Controlled?

Servo motors are typically controlled using a PWM signal from a microcontroller or servo controller. The signal determines the target position or, for continuous-rotation models, the direction and speed of rotation.

6. Can Arduino Power a Servo Directly?

An Arduino can provide the control signal, but powering a servo directly from the Arduino's 5V supply may cause voltage drops or resets, especially with multiple or high-torque servos. Use an appropriately rated external power supply when required.

7. Which Servo Motor Is Best for Robotics Projects?

The best servo depends on the robot's size, load, speed, and torque requirements. SG90 suits lightweight projects, MG90S suits compact mechanisms, while MG995 and MG996R are better suited to higher-load robotics applications.

8. Which Servo Motor Is Best for Arduino Beginners?

The SG90 micro servo motor is a popular choice for Arduino beginners because it is compact, affordable, and simple to control using standard PWM signals. It works well for basic robotics, pan-tilt mechanisms, and automation projects.

9. What Is the Difference Between SG90 and MG90S?

The SG90 generally uses plastic gears and is designed for lightweight applications. The MG90S uses metal gears, providing greater durability and better resistance to mechanical loads. MG90S is more suitable when a compact project requires stronger gearing.

10. Are Servo Motors Compatible with Arduino and Raspberry Pi?

Yes. Servo motors can be controlled using Arduino and Raspberry Pi boards through suitable PWM or servo-control interfaces. However, the servo should receive power from a supply capable of handling its current requirements, especially in multi-servo projects.

Servo Motors & Controllers for Robotics and DIY

Refined By Clear all

Categories

Featured Products

Explore Different Servo Motors Controllers for DIY Builds

All About Servo Motors & Controllers for Robotics and DIY

Servo Motor

Popular Servo Motor Comparison

Servo Selection Guide: Torque, Size & Specifications

Torque Rating

Servo Torque Worked Example

Size / Form Factor

Speed

Voltage and Current

Metal vs Plastic Gears

Continuous Rotation vs Positional Servos

Controller and Channel Count

Code Example for Servo Control

Arduino Code

Raspberry Pi

Creative DIY Projects: Robotic Arms, Animatronics & RC Cars

Beginner Tips: Wiring & PWM Control

Servo Motor Price in India

Frequently Asked Questions

1. What Is a Servo Motor?

2. What Is the Difference Between a Servo Motor and a DC Motor?

3. How Much Torque Does My Servo Need?

4. Can Servo Motors Rotate 360 Degrees?

5. How Are Servo Motors Controlled?

6. Can Arduino Power a Servo Directly?

7. Which Servo Motor Is Best for Robotics Projects?

8. Which Servo Motor Is Best for Arduino Beginners?

9. What Is the Difference Between SG90 and MG90S?

10. Are Servo Motors Compatible with Arduino and Raspberry Pi?

Let customers speak for us

Servo Motors & Controllers for Robotics and DIY

Refined By Clear all

Categories

Featured Products

Sort by:

Explore Different Servo Motors Controllers for DIY Builds

All About Servo Motors & Controllers for Robotics and DIY

Servo Motor

Popular Servo Motor Comparison

Servo Selection Guide: Torque, Size & Specifications

Torque Rating

Servo Torque Worked Example

Size / Form Factor

Speed

Voltage and Current

Metal vs Plastic Gears

Continuous Rotation vs Positional Servos

Controller and Channel Count

Code Example for Servo Control

Arduino Code

Raspberry Pi

Creative DIY Projects: Robotic Arms, Animatronics & RC Cars

Beginner Tips: Wiring & PWM Control

Servo Motor Price in India

Frequently Asked Questions

1. What Is a Servo Motor?

2. What Is the Difference Between a Servo Motor and a DC Motor?

3. How Much Torque Does My Servo Need?

4. Can Servo Motors Rotate 360 Degrees?

5. How Are Servo Motors Controlled?

6. Can Arduino Power a Servo Directly?

7. Which Servo Motor Is Best for Robotics Projects?

8. Which Servo Motor Is Best for Arduino Beginners?

9. What Is the Difference Between SG90 and MG90S?

10. Are Servo Motors Compatible with Arduino and Raspberry Pi?

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