int ledpin=13;
int inputpin=4;
int pirstate=LOW;
int value=0;
void setup() {
  pinMode(ledpin,OUTPUT);
  pinMode(inputpin, INPUT);
  Serial.begin(9600);

}
void loop() {
  value=digitalRead(inputpin);
  if(value==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;
    }
  }

}