PIC microcontroller interface with GSM SIM 300 problem

DHANANJAYA L · Jan 16, 2014

hello, I have tested the code microcontroller with pc (Computer) on hyperterminal, evrerything is OK. What are the commands? I have written the code it will send same commands but when I connected to PIC micro controller to GSM SIM SIM 300 its not working ...

jayanth.devarayanadurga · Jan 16, 2014

Post your code.

DHANANJAYA L · Jan 16, 2014

jayanth.devarayanadurga said:

Post your code.

. The following program works successfully when PIC16f877a is interfaced with HyperTerminal.

Code C - [expand]
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#define _XTAL_FREQ 4000000L
#define HIGH_SPEED 1
 
#if NINE == 1
#define NINE_BITS 0x40
#else
#define NINE_BITS 0
#endif
 
#if HIGH_SPEED == 1
#define SPEED 0x4
#else
#define SPEED 0
#endif
#define RX_PIN TRISC7
#define TX_PIN TRISC6
 
 
__CONFIG(XT & WDTDIS & PWRTEN & BORDIS & LVPDIS &
 DEBUGDIS & UNPROTECT );
#define LCD_PULSE() ((LCD_EN=1),(LCD_EN=0))
 
void wait(unsigned char msec);
void Tx_string(const char *string);
void Tx_byte(unsigned char byte);
void interrupt receive(void);
 
main()
{
TRISC=0b11000000;// Rx pin RC7 only i/p others o/ps including Tx pin
 PORTC=0b11000000;
SPBRG = 25;
 RCSTA = (NINE_BITS|0x90);
 TXSTA = (SPEED|NINE_BITS|0x20);
 
 Tx_string("AT");
 wait(100000);
 Tx_byte(0X0D);
 wait(100000);
 Tx_byte(0X0A);
 wait(100000);
 Tx_string("ATD944xxxxxxx;");
 wait(100000);
 Tx_byte(0X0D);
 wait(100000);
 Tx_byte(0X0A);
 wait(100000);
 while(1);
 }
 
void interrupt receive(void) // interrupt service routine
{
if(RCIE && RCIF)
{
RCIF = 0;
}
else if(ADIE && ADIF)
{
ADIF =0;
}
}
void Tx_string(const char *string)
{
   while(*string){
   TXREG=*string;
   while(TRMT==0);
   string++;
  }
}
void Tx_byte(unsigned char byte)
{
  while(TRMT==0); 
  TXREG=byte;
   
 }

please help me...
Thank you!

DHANANJAYA L · Jan 16, 2014

1. Interfacing SIM300 GSM module with microcontroller PIC6f877a

following program works successfully when PIC16f877a is interfaced with HyperTerminal

Code C - [expand]
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#define _XTAL_FREQ 4000000L
#define HIGH_SPEED 1
 
#if NINE == 1
#define NINE_BITS 0x40
#else
#define NINE_BITS 0
#endif
 
#if HIGH_SPEED == 1
#define SPEED 0x4
#else
#define SPEED 0
#endif
#define RX_PIN TRISC7
#define TX_PIN TRISC6
 
 
__CONFIG(XT & WDTDIS & PWRTEN & BORDIS & LVPDIS &
 DEBUGDIS & UNPROTECT );
#define LCD_PULSE() ((LCD_EN=1),(LCD_EN=0))
 
void wait(unsigned char msec);
void Tx_string(const char *string);
void Tx_byte(unsigned char byte);
void interrupt receive(void);
 
main()
{
TRISC=0b11000000;// Rx pin RC7 only i/p others o/ps including Tx pin
 PORTC=0b11000000;
SPBRG = 25;
 RCSTA = (NINE_BITS|0x90);
 TXSTA = (SPEED|NINE_BITS|0x20);
 
 Tx_string("AT");
 wait(100000);
 Tx_byte(0X0D);
 wait(100000);
 Tx_byte(0X0A);
 wait(100000);
 Tx_string("ATD944xxxxxxx;");
 wait(100000);
 Tx_byte(0X0D);
 wait(100000);
 Tx_byte(0X0A);
 wait(100000);
 while(1);
 }
 
void interrupt receive(void) // interrupt service routine
{
if(RCIE && RCIF)
{
RCIF = 0;
}
else if(ADIE && ADIF)
{
ADIF =0;
}
}
void Tx_string(const char *string)
{
   while(*string){
   TXREG=*string;
   while(TRMT==0);
   string++;
  }
}
void Tx_byte(unsigned char byte)
{
  while(TRMT==0); 
  TXREG=byte;
   
 }

please help me..
Thank u...

jayanth.devarayanadurga · Jan 16, 2014

You want to dial a number or send SMS?

You can try this code.

Code C - [expand]
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TRISC=0b10000000;// Rx pin RC7 only i/p others o/ps including Tx pin
PORTC=0b00000000;
 
Tx_string("AT\r\n");
wait(100000);
Tx_string("ATD944xxxxxxx;\r\n");
wait(100000);

kgshankar1980 · Jan 17, 2014

Re: 1. Interfacing SIM300 GSM module with microcontroller PIC6f877a

Without a question you are asking for help???

DHANANJAYA L · Jan 17, 2014

Re: 1. Interfacing SIM300 GSM module with microcontroller PIC6f877a

kgshankar1980 said:
Without a question you are asking for help???

please help me PIC with GSM sim 300 how to send and recieve SMS

DHANANJAYA L · Jan 17, 2014

jayanth.devarayanadurga said:
Post your code.

Hi please help me.. how to send sms to some other number

DHANANJAYA L · Jan 17, 2014

GSM 300 with PIC16f877A microntroller problem

Hi please help me.. pic with GSm sim300

kgshankar1980 · Jan 17, 2014

Re: 1. Interfacing SIM300 GSM module with microcontroller PIC6f877a

1. First the baud rate to communicate with SIM300 gsm module - 115200,8,N,1 (This is the default)
2. Wait till the GSM module sends "CALL READY" to the UART of the microcontroller. Untill you receive this do not send anything to the GSM module.
3. The module comes with default echo mode OFF...that means ATE0.. (this is for your info..to turn on echo use ATE1<ENTER>...)
4. Next send AT<ENTER> to the GSM module..
5. Wait for the response "\r\nOK\r\n"
6. Now test any AT command that you need.

Do not send the \n character to the gsm module after \r...

jayanth.devarayanadurga · Jan 17, 2014

Mention Which micro you are using and also the Fosc.

DHANANJAYA L · Jan 17, 2014

jayanth.devarayanadurga said:
Mention Which micro you are using and also the Fosc.

Sir,
I have used this project PIC 16F877A microcontroller and Fosc iss 4MHZ crystal oscillator..

It will not supportwith GSM SIM 300
I think some problem is intializing this code..

Thank u...

kgshankar1980 · Jan 17, 2014

@Dhananjaya

Pls stop posting 3 or 4 postings on the same name with slight change...

Putting 3 or 4 posts on the same doesnt going to help you much...

jayanth.devarayanadurga · Jan 17, 2014

I have written a code using mikroC PRO PIC. Test it and reply. It is for PIC16F877A, 4 MHz, 9600 bps. Just burn the .hex file and test.

DHANANJAYA L · Jan 17, 2014

its not opening this file I have not rar file..

DHANANJAYA L · Jan 17, 2014

Re: 1. Interfacing SIM300 GSM module with microcontroller PIC6f877a

thank u i will try..

jayanth.devarayanadurga · Jan 17, 2014

Download and install winrar evaluation version. It can also be opened using WinZip. I am attaching the hex file for testing. Rename the file to .hex file. Edit the code and use your mobile number. If you use my .hex file then it will dial to me.

Edit: Hi - Tech Code attached. I have tested it and it is working. Maybe there is problem with modem and micro connections.

Code C - [expand]
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void main() {
 
        TRISA = 0xFF;
        TRISB = 0x00;
        PORTB = 0x00;
        TRISC = 0x80;
        PORTC = 0x00;
        
        UART1_Init(9600);
        Delay_ms(200);
 
        while(1){
        
               UART1_Write_Text("AT\r");
               Delay_ms(1000);
               UART1_Write_Text("ATD9742453836;\r");
               Delay_ms(10000);
 
        }
}

DHANANJAYA L · Jan 18, 2014

Sir, same problem is coming...its no tdailing....
please help me..

DHANANJAYA L · Jan 18, 2014

Re: 1. Interfacing SIM300 GSM module with microcontroller PIC6f877a

Sir, i have tested same problem its coming..

- - - Updated - - -

Sir i have tested same problem is coming..
how to find "call READY" to microcontroller from GSM SIM 300 received how to check this using C progrmme from micro controller if you are having this code please post and i will try. because GSM send "call ready" to microcontroller is correct or not otherwise it will send some other garbage values so I have to find what it will send...

Thanks

jayanth.devarayanadurga · Jan 18, 2014

We can't help without looking your connection between micro and modem.

Code C - [expand]
1 2 3 4 5 6 7	TRISC=0b10000000;// Rx pin RC7 only i/p others o/ps including Tx pin PORTC=0b00000000; Tx_string("AT\r\n"); wait(100000); Tx_string("ATD944xxxxxxx;\r\n"); wait(100000);

PIC microcontroller interface with GSM SIM 300 problem

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