Home automation system using Arduino

#include <LiquidCrystal.h>
#include<string.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

#define light 3
#define fan 4
#define TV 5

char temp;
char str[10];
char i=0;

void setup()
{
lcd.begin(16, 2);
Serial.begin(9600);
pinMode(light, OUTPUT);
pinMode(fan, OUTPUT);
pinMode(TV, OUTPUT);
lcd.print(” Home Automation “);
lcd.setCursor(0,1);
lcd.print(”    Using PC     “);
delay(2000);
lcd.clear();
lcd.print(“Keywords For “);
lcd.setCursor(0,1);
lcd.print(“Controlling”);
delay(2000);
lcd.clear();
lcd.print(“1. LIGHT ON”);
lcd.setCursor(0,1);
lcd.print(“2. LIGHT OFF”);
delay(2000);
lcd.clear();
lcd.print(“3. FAN ON”);
lcd.setCursor(0,1);
lcd.print(“4. FAN OFF”);
delay(2000);
lcd.clear();
lcd.print(“5. TV ON”);
lcd.setCursor(0,1);
lcd.print(“6. TV OFF”);
delay(2000);
defualt();
delay(1000);
}

void loop()
{
if(temp==1)
{
if((strncmp(str,”FAN ON”, 6))==0)
{
lcd.clear();
digitalWrite(fan, HIGH);
lcd.clear();
lcd.print(“Fan Turned On”);
delay(3000);
defualt();
}

else if(strncmp(str, “FAN OFF”, 7)==0)
{
digitalWrite(fan, LOW);
lcd.clear();
lcd.print(“Fan Turned OFF”);
delay(3000);
defualt();
}

else if(strncmp(str, “LIGHT ON”, 8)==0)
{
digitalWrite(light, HIGH);
lcd.clear();
lcd.print(“Light Turned ON”);
delay(3000);
defualt();
}

else if(strncmp(str, “LIGHT OFF”, 9)==0)
{
digitalWrite(light, LOW);
lcd.clear();
lcd.print(“Light Turned OFF”);
delay(3000);
defualt();
}

else if(strncmp(str, “TV ON”, 5)==0)
{
digitalWrite(TV, HIGH);
lcd.clear();
lcd.print(“TV Turned ON”);
delay(3000);
defualt();
}

else if(strncmp(str, “TV OFF”, 6)==0)
{
digitalWrite(TV, LOW);
lcd.clear();
lcd.print(“TV Turned OFF”);
delay(3000);
defualt();
}

else
{
lcd.clear();
lcd.print(” Invalid Input”);
lcd.setCursor(0,1);
lcd.print(”   Try Again  “);
delay(3000);
defualt();
}
}
}
void serialEvent()
{
while(Serial.available())
{
char Inchar=Serial.read();
str[i]=Inchar;
i++;
lcd.print(Inchar);
delay(50);
if(Inchar == 0x0d)
{
temp=1;
//Inchar=0;
}
}
}

void defualt()
{
lcd.clear();
lcd.print(“Enter UR Choise:”);
lcd.setCursor(0,1);
lcd.cursor();
i=0;
temp=0;
}