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MG90S Mini Digital 180° Servo

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Ekostra Electronics

On April 7, 2025

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MG90S Mini Digital 180° Servo

Metal Gear, 2.2kg·cm Torque for RC and Robotics

Introduction

The MG90S is a compact digital servo featuring metal gears that provides 2.2kg·cm of torque at 4.8V. With 180° rotation and precise digital control, it’s ideal for RC models, robotics, and automation projects requiring reliable angular positioning.

Key Features

⚙️ Metal Gears

Durable all-metal gear train

💪 High Torque

2.2kg·cm (4.8V) / 2.4kg·cm (6V)

📡 Digital Control

Faster response than analog servos

📏 Compact Size

22.8×12.2×28.5mm (W×H×D)

Technical Specifications

Operating Voltage	4.8V – 6.0V DC
Rotation Angle	180° (±90° from center)
Stall Torque	2.2kg·cm (4.8V), 2.4kg·cm (6V)
Operating Speed	0.10s/60° (4.8V), 0.08s/60° (6V)
Gear Type	Full metal gears
Control Signal	PWM (50Hz, 900-2100μs pulse)
Current Draw	100-250mA (operating), 5mA (idle)
Weight	13.4g

Pin Configuration

Wire Color	Function	Arduino Connection
Brown	Ground	GND
Red	Power (4.8V-6V)	5V (with current limit)
Orange/Yellow	Signal	D9 (PWM pin)

Note: For multiple servos, use a separate power supply with common ground

Wiring with Arduino

// Basic Connections:
// Brown → GND
// Red → 5V (for testing) or external 5V-6V supply
// Orange → D9 (PWM pin)

// For multiple servos:
// - Use external power supply (5V-6V)
// - Connect all grounds together
// - Use servo library with different PWM pins

// Basic Connections:

// Brown → GND

// Red → 5V (for testing) or external 5V-6V supply

// Orange → D9 (PWM pin)

// For multiple servos:

// - Use external power supply (5V-6V)

// - Connect all grounds together

// - Use servo library with different PWM pins

Important: Arduino’s 5V regulator may overheat with multiple servos – use external power for more than 1-2 servos

Basic Control Example

// MG90S Servo Basic Example
#include <Servo.h>

Servo myservo;
const int servoPin = 9;

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

void loop() {
  // Move to 0° position
  myservo.write(0);
  delay(1000);
  
  // Move to 90° position (center)
  myservo.write(90);
  delay(1000);
  
  // Move to 180° position
  myservo.write(180);
  delay(1000);
}

// MG90S Servo Basic Example

#include <Servo.h>

Servo myservo;

const int servoPin = 9;

void setup() {

myservo.attach(servoPin);

}

void loop() {

// Move to 0° position

myservo.write(0);

delay(1000);

// Move to 90° position (center)

myservo.write(90);

delay(1000);

// Move to 180° position

myservo.write(180);

delay(1000);

}

Advanced Features

Precise Microsecond Control

// More precise control with microseconds
void setAngle(int angle) {
  int pulseWidth = map(angle, 0, 180, 500, 2500);
  myservo.writeMicroseconds(pulseWidth);
}
// MG90S typically uses 900-2100μs range

// More precise control with microseconds

void setAngle(int angle) {

int pulseWidth = map(angle, 0, 180, 500, 2500);

myservo.writeMicroseconds(pulseWidth);

}

// MG90S typically uses 900-2100μs range

Smooth Movement

// Smooth transition between positions
void smoothMove(int start, int end, int speed) {
  for (int pos = start; pos <= end; pos += 1) {
    myservo.write(pos);
    delay(speed);
  }
}

// Smooth transition between positions

void smoothMove(int start, int end, int speed) {

for (int pos = start; pos <= end; pos += 1) {

myservo.write(pos);

delay(speed);

}

Multiple Servos

// Control multiple servos
Servo servo1, servo2;

void setup() {
  servo1.attach(9);
  servo2.attach(10);
}

void loop() {
  servo1.write(45);
  servo2.write(135);
  delay(1000);
}

// Control multiple servos

Servo servo1, servo2;

void setup() {

servo1.attach(9);

servo2.attach(10);

}

void loop() {

servo1.write(45);

servo2.write(135);

delay(1000);

}

External Power

// Proper external power wiring:
// 1. Connect servo power to external supply (5V-6V)
// 2. Connect Arduino GND to external supply GND
// 3. Only connect signal wire to Arduino
// 4. Add capacitor (100-1000μF) across power lines

// Proper external power wiring:

// 1. Connect servo power to external supply (5V-6V)

// 2. Connect Arduino GND to external supply GND

// 3. Only connect signal wire to Arduino

// 4. Add capacitor (100-1000μF) across power lines