#include <ESP32Servo.h>
int motor = 18;
int trig = 22;
int echo = 23;

Servo meuServo;

void setup() {
Serial.begin(9600);
meuServo.attach(motor);
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
}
void loop() {

digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delayMicroseconds(10);
digitalWrite(trig, LOW);
long duracao = pulseIn(echo, HIGH);
int distancia = duracao * 0.0343 / 2;
Serial.print("distancia: ");
Serial.print(distancia);
Serial.println("cm");
delay(1000);
if(distancia < 20 ){
  meuServo.write(0);
delay(1000);
}
else{
  meuServo.write(90);
delay(1000);
}
}