Discussion in "Project Doubts" started by    Sudhansudeep    Aug 31, 2018.
Fri Aug 31 2018, 06:09 PM
Shall I use the program as it is given with out any changes? And Can I use the same program for 16x4 LCD sir?
Fri Aug 31 2018, 08:41 PM
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";


[ Edited Sat Sep 01 2018, 01:25 AM ]
Sat Sep 01 2018, 05:58 AM
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
Sun Sep 02 2018, 09:46 PM
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.
#define LCDWIDTH 16 //or 20
unsigned char store[LCDWIDTH+1];

change store_msg()

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

Also change clear_mybuff() as buffer is declared as 20 bytes
void clear_mybuff()
	unsigned int a;

[ Edited Sun Sep 02 2018, 09:52 PM ]
Mon Sep 03 2018, 02:23 AM
Ok sir I understood just I need to change the number 20 with 16 right?
Mon Sep 03 2018, 03:02 AM
#define LCDWIDTH 16 //or 20
unsigned char store[LCDWIDTH+1];

change store_msg()

Shall I need to write the above lines also??
Mon Sep 03 2018, 08:47 PM
This version supports 16 character messages on 16*4 or 16*2 LCDs

[ Edited Mon Sep 03 2018, 08:55 PM ]
Tue Sep 04 2018, 03:01 PM
sir i have compiled the above program i am getting the following error
program size: data=176.5 xdata=0 code=1909
target not created

Tue Sep 04 2018, 04:16 PM
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
Tue Sep 04 2018, 06:49 PM
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.

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

[ Edited Tue Sep 04 2018, 07:56 PM ]

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Tue Nov 20 2018, 03:01 PM
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Mon Nov 12 2018, 05:58 AM
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
Tue Nov 06 2018, 02:36 PM
kindly any one give solution for my problem
Mon Nov 05 2018, 09:48 PM
Pins high is the normal state. You need a program to set them low
Sun Nov 04 2018, 05:41 PM
hello, i am niranjoy, alll the port of my 8051 is always high, even i erase all the program. why is it so happen and what is the problem. any one please help me!
Sun Nov 04 2018, 02:16 PM
BASAVARAJ g kudamble
hi I am interfacing GSM 300 to 8051 microcontroller to receive message from mobile
Sat Sep 29 2018, 06:28 PM
Please post questions in the forum.
Sat Sep 29 2018, 11:26 AM
Ashfaq Ch
hi i have some AT89C51RC microcontrollers already programed. some one help us to how to download from AT89C51RC and after study and edit all corractions reload to AT89C51RC controller
Wed Sep 12 2018, 10:58 PM
hii!! some1 please let me know how i ll get rfid code to 8051 by WEIGAND mode
Tue Sep 11 2018, 08:09 PM
is there anyone here?



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