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Interfacing GSM module with PIC Microcontroller

In connection with today’s advance technology and field of embedded electronics project, interfacing GSM module with pic microcontroller is very important for remote and wireless communication. GSM stands for Global system of mobile communication is widely used chip and reliable mobile network. If we done interfacing GSM module with pic microcontroller then we can use this huge GSM network as input out output for our project.

In my project I use GSM module for sending SMS to a specified GSM mobile number. And here you can learn how we did interfacing GSM module with pic microcontroller. Here we did interfacing of GSM module with PIC16F877 microcontroller. So to complete our project we are used

1)      PIC16F877 Microcotroller

2)      SIM300 GSM module ( I used NOKIA 5130c Mobile phone as a GSM module)

3)      Serial cable (For interfacing between Microcontroller and GSM module)

Project Objective:

To complete the project we should follow some steps

1)      Test the simple AT Command.

2)      Connect a call to a GSM mobile number (Dial a number).

3)      Send a text message to a mobile number

Now question is how we test AT command?

You can easily test it on windows Hyperterminal software. See bellow picture how it look like.

Interfacing GSM module with PIC Microcontroller 

Here you can find the step by step process of how we test AT command? Must see the video

AT Command:

AT+CMGF Message Format : This command is used to select SMS protocol data unit (PDU) mode or SMS Text mode.

AT+CSCS Select TE character set : This command informs the data card of which character set is used by the TE. The data card is then able to convert character strings correctly between TE and ME character sets.

AT+CMGS Send Message : Sends a message from a TE to the network (SMS-SUBMIT). The message reference value <mr> is returned to the TE on successful message delivery. Sending can be cancelled with the <ESC> character. <ctrl-Z> must be used to indicate the ending of the message body.

Circuit Diagram:

Bellow you will see the Circuit Diagram of interfacing GSM module with pic microcontroller

Interfacing GSM module with PIC Microcontroller

Now to run this project you need the Embedded C Code. I write the C code on Mikcro c Pro for Pic bellow you will see the C-Code

Embedded C Code
// Name : Interfacing GSM module with PIC Microcontroller
// Purpose : To send SMS from PIC Microcontroller.
// Author : Subham Dutta
// Date : 03-01-14
// Website :
sbit LCD_RS at RD2_bit;
sbit LCD_EN at RD3_bit;
sbit LCD_D4 at RD4_bit;
sbit LCD_D5 at RD5_bit;
sbit LCD_D6 at RD6_bit;
sbit LCD_D7 at RD7_bit;
sbit LCD_RS_Direction at TRISD2_bit;
sbit LCD_EN_Direction at TRISD3_bit;
sbit LCD_D4_Direction at TRISD4_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D7_Direction at TRISD7_bit;
void main() {
int a[10];
lcd_out(1,1,”Send SMS to”);UART1_Init(9600); // Initialize UART module at 4800 bps
UART1_Write(0x22); //” double qoute
UART1_Write_Text(“9800220107”); // Your Telephone Number cd_chr_cp(uart_rd);
UART1_Write(0x22); //” double qoute
UART1_Write(0x0D); // mean Enter
UART1_Write_Text(“WWW.NBCAFE.IN”); //My Text Test
UART1_Write(0x22); //” double qoute
UART1_Write(26); //Ctr +Z
UART1_Write(0x0D); // mean Enter

For Proteus circuit diagram and how It simulate?  must see the video given bellow.


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32 thoughts on “Interfacing GSM module with PIC Microcontroller”

    1. Hi wen this code is suitable for Mikcro c pro for pic and personally it is good software with huge library backup.

    1. In AT command you have to send (“) (double quote) as a character and ASCII code of double code is (0x22). so send over UART i write command
      UART1_Write(0×22); //” double quote
      hope may i clear you?

  1. hellow the code is ok.i want now to receive sms from gsm and display it to lcd.please i need source code for this help me.thanks

  2. Ranjan Tarafder

    How can I get the text repeatedly for a certain gap of time? Plz hlp me…..

  3. Thank you for sharing! Great information! Which GSM module are you using? Also, can any PIC recognize the ASCII (0x22) double quote character? And (0x0D) as enter?

  4. Hi Shubham sir I am from IT background and I am try your code mentioned above but I am getting errors. Please could you send me the project file of this mikro c pro software for this interfacing

  5. Ranjan Tarafder

    What should i do if i want to connect a lm35 with it and display the temperature in a mobile phone through gsm modem?

  6. hey the program u have given is it the complete program ???
    please help im not receiving any sms when using the program in proteus

  7. Ranjan Tarafder

    Can i use the content of your project as my final year project?

    Thanx & Regards,
    Ranjan Tarafder

  8. Please can u give me or upload this complete this project, so it will help me as a demo for my project (gsm based smart protection using pic 18f452). Please upload proteus files with Hex files . Thanks

  9. can you help me please i want to know if i follow those steps i’ll be able to send a variable sms to un phone help please !!

  10. why i cannot connect modem in device manager with my iphone?
    so i cannot type in hyperterminal

  11. rama chandra rao

    can any one plz help me in my project IR REMOTE BASED CONTROLLING HOME APPLIANCES USING PIC16F877 can any 1 plzz as fast as much with CIRCUIT DIAGRAM & PROGRAM OR ANY 1 IN THAT my Simulator is MPlab

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Subham Dutta

Subham Dutta

Hi myself Subham Dutta, having 15+ years experience in filed of Engineering. I love to teach and try to build foundation of students. Try to make them imagine what they learn.

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