#include <ESP32Servo.h>
int valorini = 0;
int valorfin = 180;
#define boton 2
Servo servo_1;
int mov = 30;
boolean variable = LOW;

void setup(){
  Serial.begin(115200);
  pinMode(boton, INPUT);
  servo_1.attach(4);
  servo_1.write(valorini);
}
void loop(){
  int botonState = digitalRead(boton);
  if (botonState == 0){

    servo_1.write(valorini);
    if(valorini == valorfin){
      variable = !variable;
    }
     
    if(variable){
      valorini = valorini - mov;
      if(valorini == 0){
        variable = !variable;
        }
    }else{
      valorini = valorini + mov;
    }
    delay(300);
  }
}