#include <ESP32Servo.h>

const int servoPin = 18;
#define button    32
Servo servo;

void setup() {
  servo.attach(servoPin, 500, 2400);
   pinMode(button, INPUT_PULLUP);
}

int pos = 0; 

void loop() {
 if ((digitalRead(button) == 1)) {
   if (pos <= 0){
    for (pos = 0; pos <= 180; pos += 1) {
    servo.write(pos);
    delay(15);
    }}
  }
  if (digitalRead(button) == 1){
    if (pos = 180){
    for (pos = 180; pos >= 0; pos -= 1) {
    servo.write(pos);
    delay(15);
    }}
  }
}