//Assessment 05: Practical(PIR Sensor)
//IM/2019/039 - Lavanya Ravichandran
//Task-Write a program to detect the motion using PIR sensor.

int led = 13;                // the pin that the LED is atteched to
int sensor = 2;              // the pin that the sensor is atteched to
int state = LOW;             // by default, no motion detected
int val = 0;                 // variable to store the sensor status 

void setup() {
  pinMode(led, OUTPUT);      
  pinMode(sensor, INPUT);   
  Serial.begin(9600);        
}

void loop(){
  val = digitalRead(sensor);   // read sensor value
  if (val == HIGH) {           // check if the sensor is HIGH
    digitalWrite(led, HIGH);   // turn LED ON if the sensor is HIGH
    delay(500);                
    
    if (state == LOW) {
      Serial.println("Motion detected!"); 
      state = HIGH;       // update the variable state to HIGH
    }
  } 
  else {
      digitalWrite(led, LOW); // turn LED OFF
      delay(500);             // delay 200 milliseconds 
      
      if (state == HIGH){
        Serial.println("Motion stopped!");
        state = LOW;       // update variable state to LOW
    }
  }
}