Motion Detector

int sensor =2;
int sensor_value;

void setup() 
{
  pinMode(2,INPUT);
  pinMode(5,OUTPUT);
  Serial.begin(9600);
  pinMode(8,OUTPUT);
}
void loop()
{
  sensor_value=digitalRead(sensor);
  Serial.println(sensor_value);
  if(sensor_value==0)
  { 
   digitalWrite(5,HIGH);
   digitalWrite(8,LOW);

    }
  else if(sensor_value==1)
  {
    digitalWrite(8,HIGH);
    digitalWrite(5,LOW);
    

  }
 
  }