void setup() {
  pinMode(2, INPUT);
  pinMode(4, OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}
void loop() {
 int motion=0;
 motion = digitalRead(2);
 if(motion==HIGH){
  digitalWrite(4, HIGH);
  Serial.println("motion is detected");
}else{
  digitalWrite(4, LOW);
  Serial.println("motion is not detected");
 }
}