/*  WORK: Demostration of interfacing PIR sensor with 
 *  the Arduino UNO and detection indicating by using LED
 *  ST ID: FGS_MIT_2021_058
 */

int pinPirSensor = 3; // Sensor pin
int pinLed = 2; // LED pin

void setup() {
  pinMode(pinPirSensor, INPUT); // Setup sensor pin as input pin
  pinMode(pinLed, OUTPUT);  // Setup led pin as output pin
  /* Starts serial communication to send out commands through 
  the USB connection just for debugging purpose  
  9600 is called the 'baud rate' of the connection */
  Serial.begin(9600); 
}

void loop() {
  int pirSensor = digitalRead(pinPirSensor); // Get PIR sensor value
  if(pirSensor == HIGH) { // If PIR detects any signal
    digitalWrite(pinLed, HIGH); // Turn on LED
    Serial.print("Detected!"); // Send serial message if we need to debug
  }else { // If PIR didn't receive any signal
    digitalWrite(pinLed, LOW);  // Turn off LED
    Serial.print("No detection!");  // Send serial message if we need to debug
  }
}