How to Use Servo MG90S: Examples, Pinouts, and Specs

The MG90S is a small, lightweight servo motor commonly used in robotics and hobby projects. It features a metal gear for improved durability and provides precise control of angular position, making it ideal for applications requiring movement and positioning. This servo motor is widely appreciated for its reliability, compact size, and ease of use.

• Robotic arms and grippers
• RC vehicles (cars, boats, planes)
• Pan-tilt camera systems
• Automated mechanisms and animatronics
• Educational and DIY electronics projects

The MG90S servo motor is designed to operate efficiently in a variety of low-power applications. Below are its key technical details:

The MG90S servo motor has a 3-wire connector with the following pinout:

1. Power Supply: Ensure the servo is powered by a stable 4.8V–6.0V source. Avoid exceeding the voltage range to prevent damage.
2. Ground Connection: Connect the brown wire to the ground (GND) of your power supply and microcontroller.
3. Signal Input: Connect the orange wire to a PWM-capable pin on your microcontroller (e.g., Arduino UNO pin 9 or 10).
4. Load Considerations: Avoid overloading the servo beyond its torque rating to prevent overheating or mechanical failure.

Below is an example of how to control the MG90S servo motor using an Arduino UNO:

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

Servo myServo; // Create a Servo object to control the MG90S

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
}

• Use a dedicated power supply for the servo if it draws too much current for the microcontroller to handle.
• Avoid stalling the servo for extended periods, as this can cause overheating.
• Use proper decoupling capacitors near the servo's power supply to reduce electrical noise.

1. Servo Not Moving

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Double-check the wiring and ensure the power supply provides 4.8V–6.0V.

2. Jittery or Erratic Movement

   • Cause: Electrical noise or unstable PWM signal.
   • Solution: Add a decoupling capacitor (e.g., 100 µF) near the servo's power pins and ensure the PWM signal is stable.

3. Overheating

   • Cause: Overloading the servo or prolonged stalling.
   • Solution: Reduce the load on the servo and avoid stalling it for long durations.

4. Limited Rotation

   • Cause: Servo is designed for 180° rotation only.
   • Solution: Ensure your application does not require continuous rotation unless using a modified servo.

Q: Can the MG90S rotate continuously?
A: No, the MG90S is a standard servo with a rotation range of 0° to 180°. For continuous rotation, you would need a modified or continuous rotation servo.

Q: Can I power the MG90S directly from the Arduino?
A: While it is possible, it is not recommended if the servo draws more current than the Arduino can supply. Use an external power source for better performance.

Q: What is the lifespan of the MG90S?
A: The lifespan depends on usage conditions, but the metal gears provide improved durability compared to plastic gear servos.

Q: Can I use the MG90S with a Raspberry Pi?
A: Yes, the MG90S can be controlled using the Raspberry Pi's GPIO pins with a PWM signal. However, a dedicated power supply is recommended.