gsm module interface

[ritesh]

can u explain the logic for interfaceing of 8051 with gsm module.

i want to make the project for monetoring of temperature using gsm module through sms. i dont want to use pc.

[Amrith]

Hi Ritesh,

GSM Module can be interfaced to 8051 through UART(Tx & Rx Pins), visit engineers garage for reference circuit. You can interface temparature sensor to 8051 using ADC.

Procedure:

1. Start with UART communication & interface with GSM module & send message using microcontroller.

2. Interface ADC & read temperature values and send the same using GSM.

[AJISH ALFRED]

 

Hi Ritesh,

 

Temperature sensor give analog value as its output. So we should connect it to any adc channel of the controller to read the corresponding digital value.

GSM module can be connected to the controller through the uart pins. We can communicate with the module using AT commands for message sendind, receiving and all.

Try some sample codes for adc interfacing, serial communication. Then learn AT commands and you are ready to do the project.

Simply read value from adc and send AT commands for sms sending which includes this value in the message text.

[ritesh]

thanks amrith and ajish.

[ritesh]

sir plz give me the modal no. of gsm module which is use and low cost gsm module price.

[Amrith]

Hi Ritesh,

You can try SIM300 module from SIMCOM company, which is low cost & easily available in the market.

[midhun]

what ritesh said is right, SIM300 will be the best choice.

[samdany]

Hi,i am sam….i already sended text sms via GSM modem.but how i send my Microcontroller ADC value in decimal formate .such as Run Temp:200 Deg.  Power:200 Amp.i use Micro C code.

 

[AJISH ALFRED]

Hi Samdany,

I hope you are familiar with the printf() function in C. You can make use of the same function in your microcontroller coding. I don’t know which microcontroller are you using. Just google it to know how to do it in your microcontroller.

[samdany]

I used pic18F4550.now i want to send ADC decimal value via gsm modem.sim300.such as Temp:345 C ,please give a code sample in microC

 

Thanks for your friendly reponse.

[AJISH ALFRED]

Hi,

I’m posting the following code just to show you how can we make use of the printf function in microcontroller coding. The uart_print () code has been written for AVR actually, but you can refer the file initialization and the function prototype.

 

//==============================================================/

 

FILE uart_out = FDEV_SETUP_STREAM(uart_print, NULL,
                                         _FDEV_SETUP_WRITE);

int uart_print(char c, FILE *stream)
{
//

---

this much code is written for avr

---

//
  if (c == ‘n’)
    uart_print(‘r’, stream);
  loop_until_bit_is_set(UCSRA, UDRE);
  UDR = c;
  return 0;

//

---

this much code is written for avr

---

//
}

 

int main ()

{

      unsigned char adc_val;

      usart_init ();

      adc_init ();

 

      adc_val = adc_get ();

 

      stdout = &uart_out;    

      printf ( “nTemp:%d C”, adc_val );        

}

//==============================================================/

 

Hope this helps you.

    

[samdany]

thanks for your help…i already done this projecs..

have a nice day…

[AJISH ALFRED]

You are welcome. Congrats and have a great day…!

[Kumar]

 

Hi all,

for my final project, i have to interface gas sensor and gsm module with microcontroller to measure air quality in different place in the city. My system send back gas and position  measure. Then i chose to use SIM908 for GPS module included.

Can somebody help with idea about power supply and code? 

Please Samdany, can u send me the code of yr project. i think to find a way by analysing it. my mail is [email protected] 

thanks!!!

[Author]

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