const int PIR_PIN = 5;      
const int LED_PIN = 12;         
const int TIMER_DURATION = 5000; 

volatile bool pirTriggered = false; 
unsigned long startTime = 0;         

void IRAM_ATTR pirInterrupt() {
  pirTriggered = true;
}

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);

  attachInterrupt(digitalPinToInterrupt(PIR_PIN), pirInterrupt, RISING);

  Serial.begin(9600);
  Serial.println("PIR Sensor Timer");
}

void loop() {
  if (pirTriggered) {
    Serial.println("Motion detected....");

    startTime = millis();
    pirTriggered = false;
    Serial.println("Timer started!");
    digitalWrite(LED_PIN, HIGH); 
    Serial.print("Timer Value: ");
    Serial.println(startTime);
  }

  if (startTime > 0 && millis() - startTime >= TIMER_DURATION) {
    Serial.println("Timer expired!");
    startTime = 0;  
    digitalWrite(LED_PIN, LOW);  
  }
}