#include <ESP32Servo.h>
Servo myservo;
int pos = 0;

void setup() {
  myservo.attach(21);
  pinMode(5,INPUT_PULLUP);
  pinMode(18,INPUT_PULLUP);
}

void loop() {
  if(digitalRead(5)==LOW)
  {
    pos++;
    Serial.println(pos);
    myservo.write(pos);
    delay(15);
    if(pos>=180)
     pos=180;
  }
  if(digitalRead(18)==LOW)
  {
    pos--;
    Serial.println(pos);
    myservo.write(pos);
    delay(15);
    if(pos<=0)
     pos=0;
  }
}