Sending SMS using Atmega16

Hello Friends, in this post we are going to send text sms using atmega16a and Gsm module.

First of all, GSM module is communicated using atmega16a using serial communication.

Stuffs required:

1. Atmega16a 
2. GSM module
3. 12V, 2A dc adapter
4. Sim card having sms pack
5. Some jumper wires

Connection:

Make connection like this. 

Atmega16a                              GSM module

Tx              ========>          Rx

Rx              ========>          Tx

Gnd            ========>          Gnd

Proteus simulation

After making connections, use the following code. 

Note: We are using internal rc oscillator having frequency 8 MHz. The baud rate is 9600.

/*

Code starts here 

*/

#define F_CPU 8000000UL   // 8MHZ crytal frequency 

#include<avr/io.h>

#include<util/delay.h>

void uart_init(uint16_t ubrr_value)

{

   UBRRL = ubrr_value;                         //baud rate selection

   UBRRH = (ubrr_value>>8);                    // baud rate selection

   UCSRC|=(1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);    // data size of 8 bit

   UCSRB=(1<<RXEN)|(1<<TXEN);        // recieve enable , transmitter enable, interrupt on recieve

}

unsigned char uart_rx()

{

   while(!(UCSRA & (1<<RXC)));

   return UDR;

}

void USART_WriteChar(char data)

{

 UDR=data;

   while(!(UCSRA & (1<<UDRE)));          

_delay_ms(100);

}

void USART_WriteString(char *str)

{

int j;

for(j=0;str[j]!='\0';j++)

{

USART_WriteChar(str[j]);

}

}

 void main()

 {

 int value=0,final=0,value1=0,value2=0;

 float val=0.0;                                                                                                                                                                                                                                                                  

 DDRB=0XFF;

 DDRC=0XFF;

 uart_init(51);

 _delay_ms(20);

 while(1)

 {

USART_WriteString("AT");

_delay_ms(500);

USART_WriteChar('\n\r');

_delay_ms(1500);

USART_WriteString("AT+CMGF=1");

_delay_ms(500);

USART_WriteChar('\n\r');

_delay_ms(1000);

USART_WriteString("AT+CSMP=17,167,0,241");

_delay_ms(500);

USART_WriteChar('\n\r');

_delay_ms(1000);

USART_WriteString("AT+CMGS=");

_delay_ms(500);

USART_WriteChar('"');

_delay_ms(500);

USART_WriteString("+9199xxxxxxxx");

_delay_ms(500);

USART_WriteChar('"');

_delay_ms(500);

USART_WriteChar('\n\r');

_delay_ms(1000);

USART_WriteString("Hello World ..... ");

_delay_ms(2000);

USART_WriteChar(0x1A);

_delay_ms(30000);  // delay of 30 seconds

 }

}

/*

Code ends here 

*/

 Hope you guys had enjoyed the tutorial. In the next post, we will learn about uploading data on thingspeak channel.