int led =13;
int sensor=2;
int state=LOW;
int val=0;
void setup(){
  pinMode(led,OUTPUT);
  pinMode(sensor,INPUT);
  Serial.begin(9600);
}
void loop(){
  val=digitalRead(sensor);
  if(val==HIGH){
  digitalWrite(led,HIGH);
  delay(100);
  if(state==LOW){
    Serial.println("motion detected!");
    state=HIGH;
  }
}
else{
  digitalWrite(led,LOW);
  delay(200);
  if(state==HIGH){
    Serial.println("motion stopped!");
  }
}
}