Link Library:

ESP32Servo
By: Kevin Harrington / John K. Bennett
ESP32Servo – https://madhephaestus.github.io/ESP32Servo/annotated.html

LiquidCrystal_I2C
By: Frank de Brabander
LiquidCrystal_I2C – https://github.com/markub3327/LiquidCrystal_I2C


#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo servo;

#define SERVO_PIN 13
#define BUTTON_PIN 27

int posisi = 0;
int sudut[] = {0, 90, 180, 90, 0};

bool tombolSebelumnya = HIGH;

void setup() {
  servo.attach(SERVO_PIN, 1000, 2000);
  servo.write(sudut[posisi]);

  pinMode(BUTTON_PIN, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("SERVO SG90");
  lcd.setCursor(0, 1);
  lcd.print("Sudut: 0");
}

void loop() {
  bool tombol = digitalRead(BUTTON_PIN);

  if (tombolSebelumnya == HIGH && tombol == LOW) {

    posisi++;

    if (posisi >= 5) {
      posisi = 0;
    }

    servo.write(sudut[posisi]);

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("SERVO SG90");
    lcd.setCursor(0, 1);
    lcd.print("Sudut: ");
    lcd.print(sudut[posisi]);

    delay(300);
  }

  tombolSebelumnya = tombol;
}