#include <Servo.h>
#include <ezButton.h>

#define BUTTON_PIN 21 // ESP32 pin GPIO21 connected to button's pin
#define SERVO_PIN  26 // ESP32 pin GPIO26 connected to servo motor's pin
#define led 23

ezButton button(BUTTON_PIN); // create ezButton object that attach to pin 7;
Servo servo;                 // create servo object to control a servo

// variables will change:
int angle = 0; // the current angle of servo motor

void setup() {
  Serial.begin(9600);         // initialize serial
  button.setDebounceTime(50); // set debounce time to 50 milliseconds
  servo.attach(SERVO_PIN);    // attaches the servo on pin 9 to the servo object
  pinMode(led, OUTPUT);
  servo.write(angle);
}

void loop() {
  button.loop(); // MUST call the loop() function first

  if (button.isPressed()) {
    // change angle of servo motor
    if (angle == 0)
      angle = 90;
    else if (angle == 90){
      angle = 0;
    }

    if(angle == 90){
      or(int i=0; i<5; i++){
        digitalWrite(led, HIGH);
        delay(100);
        digitalWrite(led, LOW);
        delay(100);
      }
    }

    // control servo motor arccoding to the angle
    Serial.print("The button is pressed => rotate servo to ");
    Serial.print(angle);
    Serial.println("°");
    servo.write(angle);
  }
}