Help me to create a 16×2 LCD display in AT 89s52

[Manas Paul]

I am trying to create a LCD dispaly in AT89S52.I was full copy the (How to display number on 16×2 LCD using 8051 microcontroller (AT89C51) ) program and design the circuit. But it is not working.I had change at the first time the header file.

 

Please Help me to create a 16×2 in AT89S52 microcontroller,with circuit design and C program.Thank You.

[dagakshay]

the code must work it might be soome loose connection in the the circuit… what extaclly you getting on LCD.. i mean your LCD is fully blank, or some boxes in first line… or the back light of LCD is not glowing at all…

have you used variable resistance??… it is use to set the contarst… try to set that….

plz be a bit more specify about your problem so that i can help you out….

[Rajesh]

I am getting black sqaure boxes on the LCDJHD 162.   can any one help?

[dagakshay]

this type of cases comes when the controller will not a be able to communicate with LCD…
check the connections onces… see weather you code is properly working… check your delay function you have there must be atleast 50 micro second delay….

[chuduc]

My english is very bad I can not express their answers, Here is my code written for lcd16x2, hope it is for your help

 

#include “reg52.h”
const unsigned char clr=1,home=2,d_on=15,d_off=12,set=56;
sbit     rs=P2^0;                     
sbit     rw=P2^1;                     
sbit     e=P2^2;                      

/*  P0 noi voi LCD data
     noi 3 bit thap cua P2 voi chan cam LCD_CONTROL
     co the su dung board thi nghiem 89_v2 de chay chuong trinh
     cac lenh su dung:
    int_lcd();        cai dat lcd
    lenh(clr);        xoa lcd
    lenh(home);        dua con tro ve dau dong
    lenh(d_on);        mo display,blink
    lenh(set);        che do 16×2
    dat(1 ki tu);        xuat 1 ki tu ra lcd
    dat_str(“chuoi”);    xuat 1 chuoi ki tu ra lcd
*/

void delay(unsigned int msec)  // chuong trinh con tao thoi gian tre ms
{
    int i,j ;
        for(i=0;i<msec;i++)
        for(j=0;j<1275;j++);
}
//

---

void busy()    //chuong trinh con kiem tra lcd co ban ko
{
    rs=0;
    rw=1;
    P0_7=1;                          
    while(P0_7!=0)
    {
        e=0;
        e=1;
    }
}
//

---

void lenh(unsigned char ma)    //chuong trinh con xuat lenh len LCD
{
    busy();

    rs=0;
    rw=0;                        
    e=1;
    P0=ma;
    e=0;
}
//

---

void dat(unsigned char ma)    //chuong trinh con xuat du lieu len LCD
{
    busy();
    
    rs=1;
    rw=0;        
    e=1;
    P0=ma;
    e=0;
}
//

---

void mov(unsigned char row, unsigned char col)    //chuong trinh di chuyen con tro
{
    lenh(128 | (row << 6) | col);    //row =0 la hang dau,=1 la hang 2
}
//

---

void dat_str(unsigned char *str)    //chuong trinh xuat ra LCD mot chuoi ki tu
{
    while (*str!=’’)
    {
        dat(*str);
        str++;    
    }
}
//

---

void int_lcd()    //chuong trinh con cai dat LCD
{
    delay(2);                    //doi 2ms
    lenh(set);                    //8bit, 2 line
    //lenh(d_on);                      //display on, cursor on,blinking on
    lenh(d_off);                       //display on,cursor off,blinking off
    lenh(clr);                    //clear display
    lenh(home);                    //return home
}
//

---

void main()
{
    int_lcd();
    lenh(home);
    dat_str(“chu nguyen duc”);
    while(1);
}

 

I‘ll post the schematic tomorrow,If any problem please contact me: [email protected]. Goodlucky!!

[mon]

i also have a problem about this project…the lcd has no display other than the background light…

plzzzz help me…

thx in advance…

[AJISH ALFRED]

Hi all,

Following are the two common issues beginners found to be struggling with.

1) LCD display contains only black boxes in the first line

2) LCD shows nothing but the backlight

 

The second one occurs mostly due to the bad code. Only hardware error possible is with the RS pin, where it might be shorted to ground.

Here one should note that the LCD got initialized. This happens only when the controller is able to communicate successfully so far with the LCD module.

 

The first case occurs both due to software or hardware issues. Here the LCD not even got initialized, which means the controller might not be able to communicate with the LCD module, or the instructions sent might be wrong. There are often hardware issues as well.

 

So first make sure that your hardware connections are proper, then try to debug the code.

[balaji.n]

                                             /*LCD DRIVER*/

 

//PROGRAMED BY BALAJI ANY BUG REPORT:mail id:[email protected]

 

#include<reg51.h>                  //HEADER FILE IN KEIL 3
 #define S P3               //DEFINE PORT HERE

 

sbit rs=P2^0;              //PLEASE SELECT CONTROL BIT FOR LCD
sbit rw= P2^1;
sbit en=P2^2;

 

void cmdwrite(int value);  //FUNCTION FOR COMMAND WRITE
void datawrite(int value); //FUNCTION FOR DATAWIRTE
void delay(int itime);       //FUNCTION FOR DELAY

 

void main()
{
S=0X00;                       //PORT CONFIGURE AS THE OUTPUT
cmdwrite(0x38);
cmdwrite(0x0E);
cmdwrite(0X01);
cmdwrite(0X06);
cmdwrite(0X84);
datawrite(0x41);//PASSING THE VALUE FOR DISPLAY THE CHAR A
datawrite(0x42);

}
 void cmdwrite(int value)
{
S=value;
rs=0;
rw=0;
en=1;
delay(1);
en=0;
}
void datawrite(int value)
{
S=value;      
rs=1;
rw=0;
en=1;
delay(1);
en=0;
}
void delay(int itime)    //USER DEFINED DELAY
{
 int i,j;
for(i=0;i<itime;i++)    //IF U WANT TO MORE DELAY CHANGE THE PASSING THE VALUE
 for(j=0;j<1275;j++);
}

[Author]

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