Automate Light with PIR sensor

1void setup()
2{
3  
4pinMode(11,OUTPUT);
5pinMode(7,INPUT);
6delay(500);
7}
8
9void  loop()
10{
11
12if(digitalRead(7)==HIGH)
13{
14 
15  digitalWrite(11,HIGH);
16  delay(3000);
17  digitalWrite(11,LOW);
18
19  }
20  
21  
22  }