#include <Servo.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo servo1;
int degree = 0;
void setup() {
  Serial.begin(9600);
  pinMode(20, INPUT_PULLUP);
  pinMode(21, INPUT_PULLUP);
  servo1.attach(13);
  servo1.write(degree);
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("welcome");
}

void loop() {
  Serial.println(digitalRead(18));
  Serial.println(digitalRead(19));
  if (digitalRead(19) == 0) {
    if (degree > 0) {
      degree = degree - 10;
      lcd.clear();
      lcd.setCursor(1,1);
      lcd.print(degree);
      servo1.write(degree);

    }
  }
  if (digitalRead(18) == 0) {
    if (degree < 180) {
      degree = degree + 10;
      lcd.clear();
      lcd.setCursor(1,1);
      lcd.print(degree);
      servo1.write(degree);
    }
  }
  delay(100);
}