#define timeSeconds 10

// Set GPIOs for LED and PIR Motion Sensor
const int LED = 4;
const int motionSensor = 2;

// Timer: Auxiliary Variables
unsigned long now = millis();
unsigned long lastTrigger = 0;
boolean startTimer = false;
boolean motion = false;

// Checks if motion was detected, sets LED on HIGH, and starts a timer

void IRAM_ATTR detectsMovement(){
  digitalWrite(LED, HIGH);
  startTimer = true;
  lastTrigger = millis();
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(motionSensor, INPUT_PULLUP);

  // Set motionSensor pin as interrupt, assign interrupt function, and set RISING mode
  attachInterrupt(digitalPinToInterrupt(motionSensor), detectsMovement, RISING);

  // Set LED to LOW
  pinMode(LED, OUTPUT);
  pinMode(LED, LOW);
}

void loop() {
  // Current time
  now = millis();
  if((digitalRead(LED)==HIGH) && (motion==false)){
    Serial.println("MOTION DETECTED");
    motion=true;
  }
  
  // Turn off LED after the number of seconds defined in timeSeconds
  if(startTimer && ((now-lastTrigger)>(timeSeconds*1000))){
    Serial.println("MOTION STOPPED");
    digitalWrite(LED, LOW);
    startTimer=false;
    motion=false;
  }
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}