//IoT_Based Staircase LED Indicator By Abdul-Hafees Tijani, NXU 2024

const int pirPin = 2;      // PIR sensor pin
const int ledPin = 3;      // LED pin
int pirState = LOW;        // Start with no motion detected
int val = 0;               // Variable for reading the pin status

void setup() {
  pinMode(pirPin, INPUT);  // Declare the PIR sensor as an INPUT
  pinMode(ledPin, OUTPUT); // Declare the LED as an OUTPUT
  Serial.begin(9600);
}

void loop() {
  val = digitalRead(pirPin); // Read PIR sensor value
  if (val == HIGH) {          // If motion is detected
    digitalWrite(ledPin, HIGH); // Turn on LED
    if (pirState == LOW) {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW); // Turn off LED
    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
  }
}