#include <ESP32Servo.h>
unsigned long last_time = 0;
#define SW1 18
const int servoPin = 26;

Servo servo;
void setup() {
  Serial.begin(115200);
  pinMode(SW1, INPUT);
  servo.attach(servoPin);

}

void loop() {
if ( millis() - last_time > 500) {
    last_time = millis();
  }
}