#include <Arduino.h>

#define timeSeconds 10

const int PIR = 25;   // PIR is connected to GPIO 25
const int LED =  16;  // the number of the LED pin

unsigned long now = millis();
unsigned long lastTrigger = 0;
boolean startTimer = false;
boolean mtd = false;

// Checks if motion was detected, sets LED HIGH and starts a timer
void IRAM_ATTR detectsMovement() {
  digitalWrite(LED, HIGH);
  startTimer = true;
  lastTrigger = millis();
}

void setup() {
  Serial.begin(115200);
    pinMode(LED, OUTPUT);
    digitalWrite(LED, LOW);
    pinMode(PIR, INPUT_PULLUP);
    attachInterrupt(digitalPinToInterrupt(PIR), detectsMovement, RISING);
}

void loop() {
  // Current time
  now = millis();
  if((digitalRead(LED) == HIGH) && (mtd == false)) {
    Serial.println("MOTION DETECTED!!!");
    mtd = true;
  }
  // Turn off the LED after the number of seconds defined in the timeSeconds variable
  if(startTimer && (now - lastTrigger > (timeSeconds*1000))) {
    Serial.println("Motion stopped...");
    digitalWrite(LED, LOW);
    startTimer = false;
    mtd = false;
    }
}