[PIC] GSM communication not perform correctly

• Nov 20, 2013

• #1

A

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);
}

 

• Nov 20, 2013

• #2

jayanth.devarayanadurga

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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);
}

---

 

• Nov 20, 2013

• #3

Golden Electronics

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which GSM use, Check power supply current also, n/w led etc

 

• Nov 20, 2013

• #4

K

KVN1477

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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: Nov 20, 2013

• Nov 20, 2013

• #5

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ankiterect

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why use this line
uart1_write(0x1A);

 

• Nov 20, 2013

• #6

S

seadolphine2000

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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.

 

• Nov 25, 2013

• #7

K

KVN1477

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ankiterect said:

why use this line
uart1_write(0x1A);

Click to expand...

ctrl+z (0x1a) after massage is compulsory

 

• Nov 25, 2013

• #8

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ankiterect

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

 

• Nov 25, 2013

• #9

anj

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http://www.testech-elect.com/enfora/tutorial_send_receive_sms_using_gsm_modem.htm
check this for CSMP.

 

• Nov 26, 2013

• #10

K

KVN1477

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ankiterect said:

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

Click to expand...

these commands r used for setting text mode of modem

 

• Nov 29, 2013

• #11

A

ankiterect

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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.

 

• Nov 29, 2013

• #12

K

KVN1477

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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...