GSM Light Control System by using Mobile

1#define r1 11
2int relay1 = LOW;
3
4void setup()
5{
6  
7pinMode(r1,  OUTPUT);
8pinMode(7,INPUT);
9delay(500);
10}
11
12void loop()
13{
14
15if(digitalRead(7)==HIGH)
16{
17  
18     relay1 = ~ relay1;
19     digitalWrite(r1,relay1);
20     delay(10000);
21
22  }
23  
24  
25  }