[PIC] GSM communication not perform correctly

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ankiterect

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hello please find the error and please help me

Code: 
void main()
{
UART1_Init(9600);
UART1_Write_Text("AT");
DELAY_MS(2000);
UART1_Write(0x0D);
DELAY_MS(2000);
UART1_Write_Text("AT+CMGF=1");
DELAY_MS(1000);
UART1_Write(0x0D);
DELAY_MS(2000);
UART1_Write_Text("AT+CMGW=7877709590");
DELAY_MS(2000);
UART1_Write(0x0D);
DELAY_MS(2000);
UART1_Write_Text("Hiiii");
DELAY_MS(2000);
UART1_Write(0x0D);
DELAY_MS(2000);
UART1_Write(0x26);
DELAY_MS(2000);
UART1_Write(0x0D);
DELAY_MS(2000);
UART1_Write_Text("AT+CMSS=1");
DELAY_MS(1000);
UART1_Write(0x0D);
DELAY_MS(2000);
}
 

Try this

Code C - [expand]
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void main()
{
    //If using PIC then add TRISC = 0x80; here
    UART1_Init(9600);
    Delay_ms(200);
 
    UART1_Write_Text("AT\r\n");
    DELAY_MS(2000);
    UART1_Write_Text("AT+CMGF=1\r\n");
    DELAY_MS(2000);
    UART1_Write_Text("AT+CMGS=\"7877709590\"");
    DELAY_MS(2000);
    UART1_Write_Text("Hiiii");
    UART1_Write(0x0D);
    UART1_Write(0x26);
    UART1_Write(0x0D);
 
    while(1);
}
 

try this code it's working for SIM300 modem

uart1_init(9600);
delay_ms(400);
//ra4_bit=0;

uart1_write_text("AT");
uart1_write(10);
uart1_write(13);
delay_ms(1000);

uart1_write_text("AT+CMGF=1");
uart1_write(10);
uart1_write(13);
delay_ms(1000);

uart1_write_text("AT+CSDH=1");
uart1_write(10);
uart1_write(13);
delay_ms(1000);

uart1_write_text("AT+CSMP=17,167,0,0");
uart1_write(10);
uart1_write(13);
delay_ms(1000);

uart1_write_text("AT+CMGS=\"+91___________\"");// insert ur Number here
uart1_write(10);
uart1_write(13);
delay_ms(1000);

uart1_write_text("Hi.......");
uart1_write(0x1A);
delay_ms(5000);
 
Last edited:
It's the Hex notation of the CTRL+Z character which must be sent directly after typing your message.
Refer to the AT+CMGS command documentation.
 

why we use this line
uart1_write_text("AT+CSMP=17,167,0,0");
what is the meaning of 17,167,0,0
 

KVN1477 said:
these commands r used for setting text mode of modem
Click to expand...

i have purchased SIM 300 module but i am confused that which type of GSM sim require for this module.can i use the same sim which i am using for my mobile phone or some other connection.
 

ankiterect said:
i have purchased SIM 300 module but i am confused that which type of GSM sim require for this module.can i use the same sim which i am using for my mobile phone or some other connection.
Click to expand...

yes....u can use same sim which is used in mobile...
 

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