#include <Arduino.h>

const int pirPin = 28;
bool lastMotionState = false;

void setup() {
  Serial1.begin(115200);
  pinMode(pirPin, INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  delay(1000);
  
  Serial1.println("Motion Detection System Ready!");
  lastMotionState = digitalRead(pirPin);
}

void loop() {
  bool currentMotion = digitalRead(pirPin);

  if (currentMotion && !lastMotionState) {
    Serial1.println("\n MOTION DETECTED! Intruder alert!");
    Serial1.print("Time: ");
    Serial1.print(millis() / 1000);
    Serial1.println(" seconds");
    digitalWrite(LED_BUILTIN, HIGH);
  }
  
  if (!currentMotion && lastMotionState) {
    Serial1.println("Motion stopped.");
    digitalWrite(LED_BUILTIN, LOW);
  }
  
  lastMotionState = currentMotion;
  delay(100);
}