How to Use Micro servo 9G: Examples, Pinouts, and Specs

Introduction

The AZDelivery Micro Servo 9G (SG90) is a compact and lightweight servo motor designed for applications requiring precise angular position control. It is widely used in robotics, RC vehicles, drones, and hobby electronics projects. With its small size and ease of use, the SG90 is an excellent choice for projects where space and weight are critical factors.

Explore Projects Built with Micro servo 9G

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

Arduino Nano Controlled Micro Servo Sweeper

This circuit consists of two Arduino Nano microcontrollers and a Micro Servo 9G. One Arduino Nano controls the servo motor connected to its D6 pin, sweeping it back and forth between 0 and 180 degrees. The second Arduino Nano is present but not actively used in this configuration.

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Arduino Nano Controlled Robotic Arm with Multiple Micro Servos

This circuit consists of an Arduino Nano microcontroller connected to three Micro servo 9G motors. The Arduino Nano controls the servos via its digital pins D2, D3, and D4, while providing power and ground connections to the servos.

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Arduino UNO Battery-Powered Servo Motor Controller

This circuit uses an Arduino UNO to control a 9G servo motor, powered by a 9V battery. The Arduino runs a program that allows the servo motor to move between two positions based on user input received via the serial monitor.

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Arduino UNO Controlled Dual Servo Motion System

This circuit consists of an Arduino UNO microcontroller connected to two 9G micro servos and powered by a 9V battery. The Arduino controls the servos using PWM signals on pins D9 and D10, allowing the servos to rotate between 0 and 180 degrees. The embedded code on the Arduino sequentially moves each servo through its full range of motion and then back, demonstrating basic servo control for applications such as robotics or automated systems.

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Common Applications

• Robotics (e.g., robotic arms, grippers)
• RC vehicles (e.g., steering mechanisms)
• Drones (e.g., camera gimbals)
• Automated systems (e.g., door locks, pan-tilt mechanisms)
• Educational and hobby electronics projects

Technical Specifications

The following table outlines the key technical details of the AZDelivery Micro Servo 9G (SG90):

Pin Configuration

The SG90 servo motor has a 3-pin connector with the following pinout:

Usage Instructions

Connecting the SG90 to a Circuit

1. Power Supply: Connect the red wire to a 5V power source and the brown wire to ground (GND). Ensure the power supply can provide sufficient current (at least 500mA) to avoid voltage drops.
2. Signal Input: Connect the orange wire to a PWM-capable pin on your microcontroller (e.g., Arduino UNO).
3. Mounting: Use the included mounting hardware and servo horns to attach the SG90 to your project.

Important Considerations

• Voltage Range: Operate the servo within the specified voltage range (4.8V to 6.0V) to prevent damage.
• PWM Signal: The SG90 requires a PWM signal with a frequency of 50Hz. The pulse width determines the angular position:
  • 1ms pulse width corresponds to 0°.
  • 1.5ms pulse width corresponds to 90° (neutral position).
  • 2ms pulse width corresponds to 180°.
• Avoid Overloading: Do not exceed the stall torque rating to prevent overheating or damage to the motor.

Example Code for Arduino UNO

The following Arduino code demonstrates how to control the SG90 servo motor using the Servo library:

#include <Servo.h> // Include the Servo library

Servo myServo; // Create a Servo object to control the SG90

void setup() {
  myServo.attach(9); // Attach the servo to pin 9 on the Arduino
}

void loop() {
  myServo.write(0); // Move the servo to 0 degrees
  delay(1000);      // Wait for 1 second

  myServo.write(90); // Move the servo to 90 degrees
  delay(1000);       // Wait for 1 second

  myServo.write(180); // Move the servo to 180 degrees
  delay(1000);        // Wait for 1 second
}

Best Practices

• Use a dedicated power supply for the servo if multiple servos are used in a project.
• Avoid sudden or frequent changes in position to reduce wear on the gears.
• Calibrate the servo to ensure accurate positioning.

Troubleshooting and FAQs

Common Issues

1. Servo Not Moving

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Verify the wiring and ensure the power supply provides at least 500mA.

2. Servo Jittering

   • Cause: Electrical noise or unstable power supply.
   • Solution: Add a decoupling capacitor (e.g., 100µF) across the power and ground lines.

3. Servo Overheating

   • Cause: Prolonged operation at stall torque or excessive load.
   • Solution: Reduce the load or avoid operating the servo at its maximum torque for extended periods.

4. Limited Range of Motion

   • Cause: Incorrect PWM signal or mechanical obstruction.
   • Solution: Verify the PWM signal timing and check for physical obstructions.

FAQs

Q: Can the SG90 rotate continuously?
A: No, the SG90 is a positional servo with a rotation range of 0° to 180°. For continuous rotation, use a continuous rotation servo.

Q: Can I power the SG90 directly from an Arduino UNO?
A: While possible, it is not recommended as the Arduino's 5V pin may not provide sufficient current. Use an external power supply for reliable operation.

Q: How do I control multiple SG90 servos with an Arduino?
A: Use multiple PWM-capable pins and create separate Servo objects for each servo. Ensure the power supply can handle the combined current draw of all servos.

Q: What is the lifespan of the SG90 servo?
A: The lifespan depends on usage conditions, but proper handling (e.g., avoiding overloading) can significantly extend its operational life.