GSM based notice board

Shall I use the program as it is given with out any changes? And Can I use the same program for 16x4 LCD sir?

Status messages over 16 chars will need to be trimmed to 16 chars.

You will need to modify the LCD display routine to start a new line
after every 16 chars.


You will have to change 'Mob_no' to match your mobile.
unsigned char code Mob_no[]= "9739317976";

http://www.8051projects.net/download.php?view.248

Thank you sir I have understood that I have to change the mobile number and have to give my mobile number which I will be using. But I did not understand the concept that u have stated regarding the LCD display to trimm to 16 chars will u please tell me which line of the program to change it to 16 chars

Okay.. I assumed the project would use all 4 lines.
In fact it only uses 2, so I wonder why a 4 line display is used.

The project will only safely display message up to 10 bytes long,
which is odd, but means no changes are needed for a 16 * 4 or 16* 2 display.

Simple changes allows 16 /20 char messages.
Add
#define LCDWIDTH 16 //or 20
unsigned char store[LCDWIDTH+1];

change store_msg()

void store_msg(unsigned char msg_array[])
{
unsigned char i,j;
i=59;
j=0;
	while(msg_array[i]!='\r')  // copy to end of line or buffer full
	{
 	 store[j]= msg_array[i];
	i++;
	j++;
	if( j >
=LCDWIDTH) break;  //stop at 16 / 20
	}
	store[j]= 0; //terminate the string
  return;
}

Also change clear_mybuff() as buffer is declared as 20 bytes

void clear_mybuff()
{
	unsigned int a;
	for(a=0;a<20;a++)
		MyBuff[a]=0x00;
}

Ok sir I understood just I need to change the number 20 with 16 right?

#define LCDWIDTH 16 //or 20
unsigned char store[LCDWIDTH+1];

change store_msg()

Shall I need to write the above lines also??

This version supports 16 character messages on 16*4 or 16*2 LCDs

sir i have compiled the above program i am getting the following error
LENGTH:006H
ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
SYMBOL: MSG1
SEGMENT:?ID?GSMKEIL3
program size: data=176.5 xdata=0 code=1909
target not created

please sir can u help me in removing this error as i am using a kiel uvision 3 software as i have to complete my project in few days

Have you made any changes to the code I posted ?

The errors might be due to the version of Keil you are using.
The best fix is to get the evaluation version of Keil 5.
It has a limit of 2K, but this project is less than 2K so will be okay.

You have to register but it is free.
https://www.keil.com/demo/eval/c51.htm

Does the original project compile ?
If so you could just use that and edit your phone number and
status messages to fit.