const int ledpin = 2;
const int PIRinput = 13;

int pirState = LOW;

void setup() {
  pinMode(ledpin, OUTPUT);
  pinMode(PIRinput, INPUT);
  Serial.begin(9600);
}

void loop() {
  const int IP = digitalRead(PIRinput);
  delay(100);

  if (IP == 1) {
    digitalWrite(ledpin, HIGH);
    if (pirState == LOW) {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
    delay(1000);
  } else {
    digitalWrite(ledpin, LOW);
    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
    delay(1000);
  }
}