/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com/esp8266-nodemcu-rcwl-0516-arduino/
  
  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.
  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*/

// If you're using the built-in LED for testing, remember that it works with inverted logic
// (HIGH=LOW, and LOW=HIGH)
int led = 2;               // the pin that the LED is attached to
int sensor = 12;           // the pin that the sensor is attached to
int state = LOW;           // by default, no motion detected
int val = 0;               // variable to store the sensor status (value)

void setup() {
  pinMode(led, OUTPUT);       // initalize LED as an output
  pinMode(sensor, INPUT);     // initialize sensor as an input
  Serial.begin(115200);       // initialize serial
}

void loop(){
  val = digitalRead(sensor);   // read sensor value
  if (val == HIGH) {           // check if the sensor is HIGH
    digitalWrite(led, HIGH);   // turn LED ON
    
    if (state == LOW) {
      Serial.println("Motion detected!"); 
      state = HIGH;       // update variable state to HIGH
    }
  } 
  else {
    digitalWrite(led, LOW); // turn LED OFF
      
    if (state == HIGH){
      Serial.println("Motion stopped!");
      state = LOW;       // update variable state to LOW
    }
  }
}