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[AVR] sending and receiving sms with sim900 and avr

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mohammad.habibi

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hello all :)
I am new to this forum and this is my first post
I am using Sim900 for sending and receiving SMS with avr microcontroller atmega16
i programm this code thats write with codvision compilar
but this doesnt work :bang:
i dont know where is wrong,can u help me?
tnx all



Code C - [expand]
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/*****************************************************
AVR Core Clock frequency: 11.059200 MHz
*****************************************************/
#include <mega16a.h>
#include <alcd.h>
#include <stdio.h>
#include <delay.h>
char at_cmgs[]={'A','T','+','C','M','G','S','=','"','0','9','1','1','8','5','3','0','9','6','1','"','\n'};
#define ctrl_z 0x1a
void main(void)
{
PORTC=0x00;
DDRC=0xFF;
PORTD=0x00;
DDRD=0x02;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x47;
// Alphanumeric LCD initialization
// Connections are specified in the
// Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
// RS - PORTC Bit 0
// RD - PORTC Bit 1
// EN - PORTC Bit 2
// D4 - PORTC Bit 4
// D5 - PORTC Bit 5
// D6 - PORTC Bit 6
// D7 - PORTC Bit 7
lcd_init(16);
while (1)
      {
       delay_ms(2000);
       puts("AT");
       delay_ms(2000);
       puts("AT");
       delay_ms(2000);
       puts("AT");
       delay_ms(4000);
       puts("ATE0");
       delay_ms(4000);
       puts("AT+CMGF=1");
       delay_ms(4000);
       puts(at_cmgs);
       delay_ms(1000);
       puts("this is test");
       delay_ms(1000);
       putchar(ctrl_z);
       lcd_clear();
       lcd_gotoxy(0,0);
       lcd_puts("message sent");
       }
}

 
Last edited by a moderator:

what is your observation about output?.Do test gsm module with hyper terminal first and check the avr and GSM RX,TX connections.
 
tnx for your helping
i connect the sim900 to pc with ft232 as you said and with hyper terminal first just i could get thise strings
RDY
CPUN: 1
CPIN: READY
CALL READY
but when in hyper terminal i want to send at command to sim900, doesnt sent any thing or sim900 doesnt sent anything... :(
 
Last edited by a moderator:

You should send CRLF after each command like "AT\r\n" or you can also send "AT\r" a delay of 1 sec and next command.
 
yes thats right
when i connect sim900 to atmega16 and sent CRLF(CRLF means enter) after each command,the sms sent
my code is here

Code C - [expand]
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printf("AT");
      putchar(enter);
      delay_ms(1500);
      printf("AT");
      putchar(enter);
      delay_ms(1500);
      printf("AT");
      putchar(enter);
      delay_ms(1500);
      printf("AT+CMGF=1");
      putchar(enter);
      delay_ms(1500);
      printf("AT+CMGS=\"09118530961\"");
      putchar(enter);
      delay_ms(1500);
      printf ("SMS SEND TEST ");
      putchar(ctrl_z);



enter is 0x0d and ctrl_z is 0x1a
now i want to try recieve the sms
tnx for your helping
 
Last edited by a moderator:

This is all you need.


Code C - [expand]
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printf("AT\r\n");
      delay_ms(1000);
      printf("AT+CMGF=1\r\n");
      delay_ms(1000);
      printf("AT+CMGS=\"09118530961\"\r\n");
      delay_ms(2000);
      printf ("SMS SEND TEST ");
      putchar(ctrl_z);

 
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