int ledPin = 13; 
int inputPin = 2; 
int pirState = LOW;
int val = 0;
void setup() {
pinMode(ledPin, OUTPUT);
pinMode(inputPin, INPUT);
Serial.begin(9600);
}
void loop() 
{ 
val =digitalRead(inputPin);
if (val == HIGH) 
{
digitalWrite(ledPin, HIGH);
}
if (pirState == LOW) 
{
Serial.println("Motion detected!");
pirState = HIGH;
}

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