#include <ESP32Servo.h>
#define button_pin 9
#define servo_pin 8

Servo myservo;
int pos = 0;

void setup() {
  pinMode(button_pin, INPUT);
  myservo.attach(servo_pin);
}

void loop() {
  int button_state = digitalRead(button_pin);

  if (button_state == HIGH) {
    if (pos == 0) {
      myservo.write(90);
      delay(1000);
      pos = 90;
    } else {
      myservo.write(0);
      delay(1000);
      pos = 0;
    }
  }
}