const int pirPin = 2; // The digital pin connected to the PIR sensor's output
const int ledPin = 13; // The pin for the LED indicator (you can use the built-in LED)

// Variable to store the current state of the sensor
int sensorState = 0;

void setup() {
  // Start serial communication to display results on the Serial Monitor
  Serial.begin(9600);
  
  // Set the ledPin as an OUTPUT
  pinMode(ledPin, OUTPUT);
  
  // Set the pirPin as an INPUT
  pinMode(pirPin, INPUT);
  
  Serial.println("PIR Motion Sensor Test");
  Serial.println("Calibrating sensor...");

  // Give the sensor time to calibrate (usually 20-60 seconds)
  delay(20000); 
  
  Serial.println("Sensor ready!");
}

void loop() {
  // Read the state of the PIR sensor's output pin
  sensorState = digitalRead(pirPin);
  
  // Check if the sensor has detected motion
  if (sensorState == HIGH) {
    // If motion is detected, turn the LED on
    digitalWrite(ledPin, HIGH);
    // Print a message to the Serial Monitor
    Serial.println("Motion detected!");
    // Wait for a moment to avoid printing too many messages
    delay(1000); 
  } else {
    // If no motion is detected, turn the LED off
    digitalWrite(ledPin, LOW);
  }
}