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

Technical Specifications

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)

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 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);
}

Advanced Features

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

// Control multiple servos
Servo servo1, servo2;

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

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

// 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

Troubleshooting