ESP32-S3 Servo Motor with Arduino IDE

Introduction

Servo motors are precise actuators that rotate to specific angles between 0° and 180°.
With the PWM (Pulse Width Modulation) capability of the ESP32-S3 DevKit-N16R8, you can easily control the servo’s position.
This is ideal for robotics and automated systems where accurate angular movement is required.

Required Components

• ESP32-S3 Board
• Servo Motor
• Jumper wires
• Breadboard
• 5V Power Supply, Battery

Pinout

Circuit Diagram / Wiring

• SERVO (5V) → ESP32 5V an external 5V power supply
• SERVO (GND) → ESP32 GND
• SERVO (Signal) → ESP32 GPIO 13

Code / Programming

/*
Filename: ol_servo_sweep.ino  
Description: ESP32-S3 code to control a servo motor by sweeping it to 0°, 90°, and 180° positions with 1-second delay.  
Author: www.oceanlabz.in  
Modification: 1/4/2025  
*/

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

Servo myServo;               // Create Servo object

void setup() {
  myServo.attach(13);        // Attach the servo to GPIO 13 (safe pin for PWM on ESP32-S3)
}

void loop() {
  myServo.write(0);          // Move to 0°
  delay(1000);               // Wait for 1 second
  myServo.write(90);         // Move to 90°
  delay(1000);               // Wait for 1 second
  myServo.write(180);        // Move to 180°
  delay(1000);               // Wait for 1 second
}

Explanation

• Servo.h library simplifies PWM-based servo control.
• attach(13) connects the servo signal to GPIO 13 (PWM-capable on ESP32-S3).
• write(angle) rotates the servo to the specified angle (0°–180°).

Troubleshooting

• If the servo jitters or doesn’t move, check if the external 5V power supply is stable.
• Ensure GPIO 13 supports PWM (ESP32-S3 supports PWM on most GPIOs).
• Always connect GND of the servo and ESP32-S3 DevKit-N16R8 together.