#include <ESP32Servo.h>

const int servoPin = 18;
Servo servo;
int pos=0;
void setup() {
  Serial.begin(115200);
  pinMode(4, INPUT);
  servo.attach(servoPin, 500, 2400);
}

void loop() {
  int a=digitalRead(4);
  if (a==HIGH)
  { 
    Serial.println("motion detected activating servo");

    for (pos = 0; pos <= 180; pos += 1) {
    servo.write(pos);
    delay(10);
  }
  }

}