DTMF_controlled_home_appliances

DTMF_controlled_home_appliances

Code: 

#include <avr/io.h>
#define F_CPU 8000000ul
#include<util/delay.h>

#define key PINC
#define key1 PC4
#define key2 PC5
#define key3 PC6

#define out PORTA
#define out1 PA0
#define out2 PA1
#define out3 PA2

#define lcd PORTB
#define lcd_cmd PORTD

void lcdcmd(char ch)
{
lcd=ch;
lcd_cmd=0x04;
_delay_ms(50);
lcd_cmd=0x00;
}

void lcddata(char ch)
{
lcd=ch;
lcd_cmd=0x05;
_delay_ms(50);
lcd_cmd=0x01;
}

void lcdstring(char *str)
{
  while(*str!='\0')
  {
lcddata(*str);
str++;
_delay_ms(10);
  }
}

void lcdinit()
{
  lcdcmd(0x38);
  lcdcmd(0x06);
  lcdcmd(0x0e);
  lcdcmd(0x01);
}

int main(void)
{
DDRA=0xff;
DDRC=0x00;
DDRB=0xff;
DDRD=0xff;
lcdinit();
PORTC=0xff;
    lcdstring("Home Automation");
lcdcmd(0xc0);
lcdstring("Enter UR Choice");
_delay_ms(2000);
    while(1)
    {
       if(!(key & (1<<key1))  && !(key & (1<<key2)) && !(key & (1<<key3)))
  {
  lcdcmd(1);
  lcdstring("All OFF");
  out=0x00;
  }
 
  else if((key & (1<<key1))  && (key & (1<<key2)) && (key & (1<<key3)))
  {
  lcdcmd(1);
  lcdstring("All ON");
  out=0xFF;
  }
 
  else if(!(key & (1<<key1))  && (key & (1<<key2)) && (key & (1<<key3)))  // light on
   {
lcdcmd(1);
lcdstring("LIGHT ON");
   out|=1<<out1;
   }

else if((key & (1<<key1))  && !(key & (1<<key2)) && (key & (1<<key3)))   // light off
{
lcdcmd(1);
lcdstring("LIGHT OFF");
out&=~(1<<out1);
}

 else if(!(key & (1<<key1))  && !(key & (1<<key2)) && (key & (1<<key3)))   // FAN ON
 {
 lcdcmd(1);
 lcdstring("FAN ON");
 out|=1<<out2;
 }

  else if((key & (1<<key1))  && (key & (1<<key2)) && !(key & (1<<key3)))   // FAN off
  {
  lcdcmd(1);
  lcdstring("FAN OFF");
  out&=~(1<<out2);
  }
 
  else if(!(key & (1<<key1))  && (key & (1<<key2)) && !(key & (1<<key3)))   // TV ON
  {
  lcdcmd(1);
  lcdstring("TV ON");
  out|=1<<out2;
  }
 
  else if(!(key & (1<<key1))  && !(key & (1<<key2)) && (key & (1<<key3)))   // TV off
  {
  lcdcmd(1);
  lcdstring("TV OFF");
  out&=~(1<<out3);
  }
 
  else
  {
              lcdcmd(1);
 lcdstring("Invalid Key  ");
 lcdcmd(0xc0);
 lcdstring("Try Again....");  
  }
    }
return 0;
}

Simulation: