#include <ESP32Servo.h>

Servo motor1; 
Servo motor2;
Servo motor3;
Servo motor4;

void setup() {
  motor1.attach(4); 
  motor2.attach(16);
  motor3.attach(19);
  motor4.attach(21);
}

void loop() {
  motor1.write(0);
  motor2.write(0);
  motor3.write(0);
  motor4.write(0);
  delay(500);

  motor1.write(45);
  motor2.write(45);
  motor3.write(45);
  motor4.write(45);
  delay(500);

  motor1.write(90);
  motor2.write(90);
  motor3.write(90);
  motor4.write(90);
  delay(500);

  motor1.write(135);
  motor2.write(135);
  motor3.write(135);
  motor4.write(135);
  delay(500);

  motor1.write(180);
  motor2.write(180);
  motor3.write(180);
  motor4.write(180);
  delay(500);
}