const int pirPin = 28;    // GPIO 2 connected to PIR sensor
const int ledPin = 15;   // GPIO 15 connected to LED

void setup() {
  pinMode(pirPin, INPUT);   // Set PIR sensor pin as input
  pinMode(ledPin, OUTPUT);  // Set LED pin as output
  Serial1.begin(115200);     // Initialize serial communication
}

void loop() {
  int sensorValue = digitalRead(pirPin);  // Read the PIR sensor value

  if (sensorValue == HIGH) {
    digitalWrite(ledPin, HIGH);  // Turn LED on if motion is detected
    Serial1.println("Motion detected!");
  } else {
    digitalWrite(ledPin, LOW);   // Turn LED off if no motion
    Serial1.println("No motion.");
  }

  delay(500);  // Wait for 500 milliseconds before reading again
}