Requires complete code for wireless notice board

[RUBEN KURIAKOSE]

Hi friends,

                 I am doing a project entitled ‘Wireless notice board’ using GSM and LCD witout PC. I got the program of interfacing of GSM modem and LCD from engineers garage. But require the complete code so that message send from a phone to GSM modem will display in the LCD. Please upload the complete code.

 

[Jason Jordon]

what type of LCD are you using for the board? 16X2?? Is it 8051 based?

[RUBEN KURIAKOSE]

I am using a 20*4 LCD display and an AT89S52 mc.

The codes in engineers garage will only interface the LCD and GSM modem. But i want to send message from a phone which is supposed to be displayed on LCD

[RUBEN KURIAKOSE]

The c program i used is given below. But while compiling it there shows an error ‘DATA SEGMENT EXEEDS’. When i decrease the size of array a[161] it shows no error. But the loop works on 161.

 

#include <REGX51.H>
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
void lcd_command(unsigned char);
void lcd_data(unsigned char);
void string(unsigned char *disp);
void delay(unsigned int);
void read(char*);
void newline();
void display (char);
void send();
void serial();
void nextline(unsigned char);
void nextline1(unsigned char);
void nextline2(unsigned char);
sfr chdata=0xA0;
void lcdnewline();
char a[161];
char b[13];
int i,j,z,k,l,f=0;
void main()
{
P0=0x00;
P1=0x00;
P2=0xFF;           
delay(100);               
lcd_command(0x38);
delay(100);
lcd_command(0x80);
delay(100);
lcd_command(0xc0);
delay(100);
lcd_command(0x0e);
delay(100);
lcdnewline();
serial();
read(“AT”);
newline();
read(“AT+CMGF=1”);
newline();
lcdnewline();
read(“AT+CMGD=1”);
newline();
lcdnewline();
while(1)
{
lcd_command(0x83);
string(“NOTICE BOARD”);
for(i=0;i<=13;i++)
{
while(RI==0);
b=SBUF;
RI=0;
}
lcdnewline();
string(“Command Signal”);
if((b[2]==’+’)||(b[3])==’+’)
{
if((b[3]==’C’)||(b[4])==’C’)
{
if((b[4]==’M’)||(b[5]==’M’))
{
if((b[5]==’T’)||(b[6])==’T’)
{
if((b[6]==’I’)||(b[7])==’I’)
{
lcd_command(0xC4);
string(“received”);
lcdnewline();
//delay(300);
read(“AT+CMGF=1”);
newline();
read(“AT+CMGR=1”);
newline();
newline();
//newline();
//newline();
for(l=0;l<=161;l++)
{
while(RI==0);
a[l]=SBUF;
RI=0;
}
for(l=60;l<=161;l++)
{
f=1;
if(a[l]==’a’)
{
k=0;
do
{
k++;
l++;
if(k<=20)
{
lcd_data(a[l]);
}
if((k>20) && (k<=40))
{
nextline(f);
lcd_data(a[l]);
f++;
}
if((k>40) && (k<=60))
{
nextline1(f);
lcd_data(a[l]);
f++;
}
if((k>60) && (k<=80))
{
nextline2(f);
lcd_data(a[l]);
f++;
}
} while(a[l]!=’$’);
l=162;
break;
}
//break;
}
delay(65000);
}
}
}
}
}
}  /* while end here*/
}  /* MAIN ends here*/
/* PROTOTYPE FUNCTIONS */
void lcd_command(unsigned char value)
{
chdata=value;
rs=0;
rw=0;
en=1;
delay(100);
en=0;
}
void lcd_data(unsigned char value)
{
chdata=value;
rs=1;
rw=0;
en=1;
delay(150);
en=0;
}
void read(char *ch)
{
int i;
for(i=0;ch!=’’;i++)
{
display(ch);
}
}
void display(char c)
{
SBUF=c;
send();
}
void send()
{
while(TI==0);
TI=0;
}
void newline()
{
SBUF=’r’;
while(TI==0);
TI=0;
SBUF=’n’;
while(TI==0);
TI=0;
}
void delay(unsigned int num)
{
unsigned int k,q;
for(k=0;k<num;k++)
{
for(q=0;q<num;q++);
}
}
void lcdnewline()
{
lcd_command(0x01);
delay(100);
lcd_command(0x02);
delay(100);
}
void serial()
{
SCON=0x50;
TMOD=0x20;
TH1=0xFD;
TR1=1;
}
void string(unsigned char *disp)
{
int x;
for(x=0;disp[x]!=0;x++)
{
lcd_data(disp[x]);
}
}
void nextline(unsigned char v)
{
if(v==1)
{
lcd_command(0XC0);
}
}
void nextline1(unsigned char v)
{
if(v==21)
{
lcd_command(0X94);
}
}
void nextline2(unsigned char v)
{
if(v==41)
{
lcd_command(0XD4);
}
}

 

 

[AJISH ALFRED]

Hi Ruben,

“DATA SEGMENT EXEEDS”

That simply meansd your microcontroller don’t have enough memory to store that much number of variables. Even if you go for advanced microcontrollers you can’t create an array more than 500 bytes long.

So what you have to understand is that this is not a proper method of coding.

[Author]

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