#define timeSeconds 10
const int led = 26;
const int motionSensor = 27;
unsigned long now = millis();
unsigned long lastTrigger = 0 ;
boolean startTimer = false;

void IRAM_ATTR detectsMovement(){

Serial.println("MOTION DETECTED!!!");
digitalWrite(led, HIGH);
startTimer = true;
lastTrigger = millis();

}

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

}

void loop() {
  now = millis();
  if (startTimer && (now- lastTrigger > (timeSeconds*1000))){
    Serial.println("Motion Stopped...");
    digitalWrite(led, LOW);
    startTimer = false;
  }
}