int led = 13;
int pir = 10;
int val = 0;
int state = LOW;



void setup() {
  // put your setup code here, to run once:
  pinMode (led, OUTPUT);
  pinMode (pir, INPUT);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
   val = digitalRead(pir);
   if (val == HIGH)
   {
    digitalWrite(led, HIGH);

      if (state == LOW)
      {
        Serial.println("Motion detected!");
        state = HIGH;
      }
   }
   

}