Hi NK,
I have written a code for this purpose. Actually these code were collected and rearrange from this site only. I have done small changes.
i have not tried this. can you please check this? Please tell me any any modifications are needed or not.
#define F_CPU 12000000UL // set CPU freq.
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) – 1)
#include<avr/io.h>
#include<util/delay.h>
#define LCD_DATA PORTA // LCD DATA PORT.
#define ctrl PORTB // CONTROL PORT FOR LCD.
#define en PB2 // ENABLE SINGNAL FOR LCD.
#define rw PB1 // READ/WRITE SIGNAL FOR LCD.
#define rs PB0 // REGISTER SELECTION SIGNAL FOR LCD.
#define MOTOR_CONTROL PORTC // MOTOR CONTROL PORT.
void LCD_cmd(unsigned char cmd);
void init_LCD(void);
void LCD_write(unsigned char data);
void usart_init();
void usart_putch(unsigned char send);
unsigned int usart_getch();
void compare_string();
unsigned int final_result;
unsigned char msg[] = “”;
unsigned char on[]=”MTR ON”;
unsigned char off[]=”MTR OFF”;
int main(void);
{
while(1)
{
uart_init(); // initialize UART port.
usart_message(“ATrn”); // Sent AT into USART.
_delay_ms(10000);
usart_message(“AT+CMGF=1rn”); //Select mesage mode in text mode.
_delay_ms(1000);
usart_message(“AT+CPMS=’SM’rn”); // Select the mesage memory.
_delay_ms(1000);
usart_message(“AT+CMGR=1rn”); // Read the message from index 1.
usart_getch(msg[]);
compare_string();
final_result=fresult;
if(final_result==0)
{
PORTC=0x01;
usart_message(“ATrn”); // Sent AT into USART.
_delay_ms(10000);
usart_message(“AT+CMGF=1rn”); //Select mesage mode in text mode.
_delay_ms(1000);
usart_message(“AT+CPMS=’SM’rn”); // Select the mesage memory.
_delay_ms(1000);
usart_message(“AT+CMGS=+918197103408rn”); // SEND the message.
usart_message(“MOTER IS ON.”);
init_LCD();
LCD_write(“MOTOR IS ON.”);
}
if(final_result==1)
{
PORTC=0x00;
usart_message(“ATrn”); // Sent AT into USART.
_delay_ms(10000);
usart_message(“AT+CMGF=1rn”); //Select mesage mode in text mode.
_delay_ms(1000);
usart_message(“AT+CPMS=’SM’rn”); // Select the mesage memory.
_delay_ms(1000);
usart_message(“AT+CMGS=+918197103408rn”); // SEND the message.
usart_message(“MOTER IS OFF.”);
init_LCD();
LCD_write(“MOTER IS OFF.”);
}
}
}
LCD_write(“MOTER IS OFF.”);
void init_LCD(void) //Function to initialize LCD.
{
LCD_cmd(0x38);
mode
_delay_ms(1);
// initialization of 16X2 LCD in 8bit
LCD_cmd(0x01); // clear LCD
_delay_ms(1);
LCD_cmd(0x0E); // cursor ON
_delay_ms(1);
LCD_cmd(0x80);
0th position
_delay_ms(1);
return;
}
void LCD_cmd(unsigned char cmd) //Function to LCD command.
{
LCD_DATA=cmd;
ctrl =(0<<rs)|(0<<rw)|(1<<en);
_delay_ms(1);
ctrl =(0<<rs)|(0<<rw)|(0<<en);
_delay_ms(50);
return;
}
void LCD_write(unsigned char data) //Function to write a letter in LCD.
{
LCD_DATA= data;
ctrl = (1<<rs)|(0<<rw)|(1<<en);
_delay_ms(1);
ctrl = (1<<rs)|(0<<rw)|(0<<en);
_delay_ms(50);
return ;
}
void LCD_write_string(unsigned char *str) //Function to write a string in LCD.
value of the string in pointer *str
{
int i=0;
while(str!=’ ’)
go on till the NULL character in the string
{
LCD_write(str);
sending data on LCD byte by byte
i++;
}
return;
void usart_init() // Function to initialize USART.
{
UCSRB |= (1 << RXEN) | (1 << TXEN);
// Turn on the transmission and reception circuitry
UCSRC |= (1 << URSEL) | (1<<USBS) | (1 << UCSZ0) | (1 <<
UCSZ1);
// Use 8-bit character sizes
UBRRL = BAUD_PRESCALE; // Load lower 8-bits of the baud rate
value..
// into the low byte of
the UBRR register
UBRRH = (BAUD_PRESCALE >> 
; // Load upper 8-bits of the
baud rate value..
// into
the high byte of the UBRR register
}
void usart_message(unsigned char *var) // transmits ASCII string
{
int h;
while(*var)
usart_putch(*var++);
for(h=0;h<=200;h++); //sends characters one by one till string ends
}
unsigned int usart_getch()
{
while ((UCSRA & (1 << RXC)) == 0);
// Do nothing until data have been
received and is ready to be read from UDR
return(UDR); // return the byte
}
int compare_string(); // Function to string comparition.
{
{
char on[],off[], msg[], result,fresult;
result = compare_string1(on, msg);
if(result==0)
{
fresult=1;
return fresult;
}
result = compare_string2(off,msg);
if ( result == 0 )
{
fresult=0;
return fresult;
}
}
int compare_string1(char *on, char *msg)
{
while(*on==*msg)
{
if ( *on == ‘ ’ || *msg == ‘ ’ )
break;
on++;
msg++;
}
if( *on == ‘ ’ && *msg == ‘ ’ )
return 0;
else
return -1;
}
int compare_string2(char *off, char *msg)
{
while(*off==*msg)
{
if ( *off == ‘ ’ || *msg == ‘ ’ )
break;
off++;
msg++;
}
if( *off == ‘ ’ && *msg == ‘ ’ )
return 0;
else
return -1;
}
}