#define led 7
#define pir 12
int pirv=0;

void setup() 
{
pinMode(pir, INPUT);
pinMode(led, OUTPUT);
Serial.begin(9600);
}

void loop() 
{
int pirv= digitalRead(pir);
Serial.println(pirv);
if (pirv==HIGH)
{
 digitalWrite(led, HIGH);
 Serial.println("your there");
}
else
{
  digitalWrite(led, LOW);
  Serial.println("your not there");
}
}