Home automation

int led1 =5;
int led2 = 6;
int led3 = 7;
int sensor = 3;
int val;
void setup()
{
 pinMode(led1,OUTPUT);
 pinMode(led2,OUTPUT);
 pinMode(led3,OUTPUT);
}
void loop()
{
 val=digitalRead(sensor);
 if(val==HIGH)
 {
   digitalWrite(led1,HIGH);
   digitalWrite(led2,HIGH);
   digitalWrite(led3,HIGH);
 }
 else
 {
   digitalWrite(led1,LOW);
   digitalWrite(led2,LOW);
   digitalWrite(led3,LOW);
 }
}