#define LED 8
#define Sensor_D 3

void setup() {
  
pinMode(LED, OUTPUT);
digitalWrite(LED, LOW);
pinMode(Sensor_D, INPUT);

Serial.begin(9600);

}

void loop() {

  int sensorValue= digitalRead(Sensor_D);
 
   if (sensorValue == HIGH) {                 
    digitalWrite(LED, HIGH); 
    Serial.println("motion detected");
    delay(1000);

  } else {
    digitalWrite(LED, LOW); 
    Serial.println("motion endded");      
    delay(1000);          
  }

}