How to Control Multiple Servos with Arduino Easily

To control multiple servos with Arduino, use the Servo library to create separate servo objects for each motor. Attach each servo to a different PWM pin and control them independently by writing angles with servo.write().

Syntax

Use the Servo library to control servos. Create a Servo object for each motor, attach it to a pin, and set its angle.

• Servo servoName; - declares a servo object.
• servoName.attach(pin); - connects the servo to a PWM pin.
• servoName.write(angle); - moves the servo to the specified angle (0-180 degrees).

arduino

#include <Servo.h>

Servo servo1; // create servo object
Servo servo2;

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

void loop() {
  servo1.write(90);  // set servo1 to 90 degrees
  servo2.write(45);  // set servo2 to 45 degrees
  delay(1000);
}

Example

This example shows how to control two servos independently. Each servo moves to different angles with a delay, demonstrating multiple servo control.

arduino

#include <Servo.h>

Servo servo1;
Servo servo2;

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

void loop() {
  servo1.write(0);    // servo1 to 0 degrees
  servo2.write(180);  // servo2 to 180 degrees
  delay(2000);

  servo1.write(180);  // servo1 to 180 degrees
  servo2.write(0);    // servo2 to 0 degrees
  delay(2000);
}

Output

Servos move to 0 and 180 degrees alternately every 2 seconds.

Common Pitfalls

Common mistakes when controlling multiple servos include:

• Not creating separate Servo objects for each servo.
• Attaching multiple servos to the same pin.
• Using pins that do not support PWM signals.
• Powering too many servos directly from the Arduino 5V pin, causing voltage drops.

Always use separate pins and provide external power if controlling many servos.

arduino

// Wrong way: Using one Servo object for multiple servos
#include <Servo.h>

Servo servo;

void setup() {
  servo.attach(9);  // Only one servo attached
}

void loop() {
  servo.write(90);  // Only controls one servo
  delay(1000);
}

// Right way: Separate Servo objects
#include <Servo.h>

Servo servo1;
Servo servo2;

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

void loop() {
  servo1.write(90);
  servo2.write(45);
  delay(1000);
}

Quick Reference

Tips for controlling multiple servos:

• Use the Servo library and create one object per servo.
• Attach each servo to a unique PWM pin.
• Use servo.write(angle) to set position.
• Provide external power for many servos to avoid Arduino resets.
• Use delay() to give servos time to move.

Key Takeaways

Create a separate Servo object for each servo motor.

Attach each servo to a unique PWM pin on the Arduino.

Use servo.write(angle) to control servo position from 0 to 180 degrees.

Avoid powering many servos directly from Arduino; use external power.

Delays help servos reach their target positions smoothly.