INTERFACING LCD TO 8051 BY Qurat-ul-ain

[query]

 

i am interfacing lcd to 8051. bt my lcd is showing just blocks. the code is

perfect n the circuit is correctly patched. wat can be the reason?

[nitin]

dude after selection of line try giving initialisation command

or else make initialisation a function and include in the select line function.

try this…..

good luck……..

[Qaisar]

if u could put ur code here then its easy to find out the problem .. 

 

[Qaisar]

 

 

[sachin]

same is proublem with mee… lcd showing only blocks…..i made 8051 based “A” chracter displaying on lcd….. from engg gagare site….plz help me….   i am just a begineer in microcontroller…………..

[Rogen Lee]

same problem to our project also. The project were made is an liquid level alarm using the 8051 and the ouput we are using is an 16×2 lcd. We found out that the lcd was only light, it has no display. So, please help me to find the solution of our problem and so we can have a successfull project. Thank you.

[Qaisar]

follow this code and diagram to display text and numbers on lcd..

 

 

#include <AT89X51.H>

#include < my.h > // built in delay function

 

#define lcd_data P2

sbit en=P0^1;

sbit rs=P0^0;

 

 

unsigned char z;

unsigned int i;

 

         void lcdcmd(unsigned char value)

        {

              lcd_data=value;

               rs=0;

  en=1;

  delay(200);

  en=0;

  return;

 }

 

void lcddata(unsigned char value)

{

  lcd_data=value;

rs=1;

en=1;

delay(200);

en=0;

return;

   }

 

void main(void)

{

   lcdcmd(0X38);//5X7 matrix

  lcdcmd(0X0E);//lcd on ,curor on

  lcdcmd(0X01); // clear lcd command

  lcdcmd(0X80);//move cursor to line1

 

  {

unsigned char name[]=” TEST PROGRAMME “;

 

for(z=0;z<=16;z++)

lcddata(name[z]);

 

  lcdcmd(0XC2); // move cursor to line2, position 2

 

for(i=48;i<=57;i++)

  lcddata(i);

 

while(1);

 }

 

} 

 

 

wysiwyg_imageupload:3061:

[sachin]

i try to compile the program using keil uvision4,but these error occurs

 

.
7.c.c(3): warning C318: can’t open file ‘my.h’
7.c.c(18): warning C206: ‘delay’: missing function-prototype
7.c.c(18): error C267: ‘delay’: requires ANSI-style prototype
Target not created

 

what is its mean????

 

 

 

but my program to show “A” character

is there is any mictake plz tell meee…..

 

 

 

 

#include<reg51.h>
sfr lcd_data_pin=0xA0;
sbit rs=P3^0;  //Register select pin
sbit rw=P3^1;  // Read write pin
sbit en=P3^6;  //Enable pin

void delay(unsigned int count)  // Function to provide time delay in msec.
{
int i,j;
for(i=0;i<count;i++)
  for(j=0;j<1275;j++);
}

void lcd_command(unsigned char comm)  //Function to send commands to LCD.
{
lcd_data_pin=comm;
en=1;
rs=0;
rw=0;
delay(1);
en=0;
}

void lcd_data(unsigned char disp)  //Function to send data to LCD
{
lcd_data_pin=disp;
en=1;
rs=1;
rw=0;
delay(1);
en=0;
}

void lcd_ini()  //Function to initialize the LCD
{
lcd_command(0x38); 
delay(2);
lcd_command(0x0F);
delay(2);
lcd_command(0x82);  //Set cursor to blink at line 1 positon 2
delay(2);
}

void character()
{
lcd_command(64);  //Address where values of the first custom character is stored
lcd_data(0);
lcd_data(10);
lcd_data(21);
lcd_data(17);
lcd_data(10);
lcd_data(4);
lcd_data(0);
lcd_data(0);
lcd_command(0xC0);  //Address of the location where the character is to be displayed
lcd_data(0);  // Displaying the character created at address 0x64
delay(10);

lcd_command(72);
lcd_data(0);
lcd_data(0);
lcd_data(0);
lcd_data(10);
lcd_data(0);
lcd_data(4);
lcd_data(17);
lcd_data(14);
lcd_command(0x80);
lcd_data(1);
delay(10);

lcd_command(80);
lcd_data(0);
lcd_data(0);
lcd_data(10);
lcd_data(0);
lcd_data(4);
lcd_data(0);
lcd_data(14);
lcd_data(17);
lcd_command(0x82);
lcd_data(2);
delay(10);
lcd_command(88);
lcd_data(1);
lcd_data(3);
lcd_data(5);
lcd_data(9);
lcd_data(9);
lcd_data(11);
lcd_data(27);
lcd_data(24);
lcd_command(0x84);
lcd_data(3);
delay(10);

lcd_command(96);
lcd_data(0);
lcd_data(10);
lcd_data(0);
lcd_data(31);
lcd_data(17);
lcd_data(14);
lcd_data(0);
lcd_data(0);
lcd_command(0x86);
lcd_data(4);
delay(10);

lcd_command(104);
lcd_data(10);
lcd_data(0);
lcd_data(4);
lcd_data(0);
lcd_data(14);
lcd_data(17);
lcd_data(17);
lcd_data(14);
lcd_command(0xC2);
lcd_data(5);
delay(10);

lcd_command(112);
lcd_data(0);
lcd_data(10);
lcd_data(0);
lcd_data(0);
lcd_data(4);
lcd_data(0);
lcd_data(31);
lcd_data(0);
lcd_command(0xC4);
lcd_data(6);
delay(10);

lcd_command(120);
lcd_data(0);
lcd_data(17);
lcd_data(10);
lcd_data(17);
lcd_data(4);
lcd_data(0);
lcd_data(14);
lcd_data(17);
lcd_command(0xC6);
lcd_data(7);
delay(10);
}

void main()
{
lcd_ini();
character();
}

[sourabh]

 

try this

 

 

 

 

#include<reg52.h>

sbit rs   = P1^3;

sbit rw   = P1^4;

sbit en   = P1^6;

 

 

int i;

 

void delay(unsigned int);

void data1();

void cmd(int);

void lcdin();

void lcd(int);

 

void main()

{

  

  char *a;

 

  a=””;                                       //write your string here

  lcdin();

  

  for(i=0;a!=’’;i++)

  lcd(a);

   while(1);

}

 

void delay(unsigned int b)

{ int i,j;

   for(i=0;i<b;i++)

   for(j=0;j<1275;j++);

}

 

void data1()

{

 rs=1;

 rw=0;

 en=1;

 delay(1);

 en=0;

 delay(1);

}

 

 

void cmd(int a)

{

 P2=a;

 rs=0;

 rw=0;

 en=1;

 delay(1);

 en=0;

 delay(1);

}

 

void lcdin()

{

 cmd(0x38);

 cmd(0x0e);

 cmd(0x01);

 cmd(0x06);

 cmd(0x80);

}

 

void lcd(int a)

{ 

  

  P2=a;

  data1();

}

[sourabh]

sachin the “my.h” file may be the user defined file of the user that’s why it is showing error in your system. He may have saved that module and is using it again for delay purposes.

[sourabh]

Nitin if your circuit and code are proper then you try to change the contrast of your lcd or look at the screen at different angle, Sometimes it happens that due to contrast problem the characters are n;t visible. Or you try out with a different lcd, also check that is it properly soldered or not.

[sachin]

frend proublem is still same…

plz send me hex code of this program….

[sourabh]

This is the content of hex file.  Save it in notepad with .hex format before burning it to your controller. Also I use at89s52 controller.

 

 :0F08AE006275737479206B69206D6973747900BA

:100800007508FF750908750AAE12088BE4F50BF53B

:100810000CAB08AA09A90A850C82850B831208363D

:10082000FF60113395E0FE1208DF050CE50C70E166

:06083000050B80DD80FED7

:08086300C294D2967F017E00D1

:10086B00E4FDFCC3ED9FEC9E5015E4FBFA0BBB00C3

:0F087B00010ABA04F8BBFBF50DBD00010C80E4C7

:01088A00224B

:0A08D500D293120863C29602086B6A

:0C08BD008FA0C293120863C29602086B61

:10088B007F387E001208BD7F0E7E001208BD7F01EF

:10089B007E001208BD7F067E001208BD7F807E00A1

:0308AB000208BD83

:0508DF008FA00208D506

:030000000208C92A

:0C08C900787FE4F6D8FD75810C02080071

:10083600BB010CE58229F582E5833AF583E0225077

:1008460006E92582F8E622BBFE06E92582F8E222C1

:0D085600E58229F582E5833AF583E49322DB

:00000001FF

 

[Qaisar]

my.h is delay file that exist in my Ex1 folder .

open kiel folder then open  my Ex1 ,

copy my.h file to ur project …or just use ur own delay routine…

 

[Rogen Lee]

hello guys. Please help me how to display an lcd to our project. Here is the code of our project.

 

#include<reg51.h>

sbit rs=P1^0; //register select pin

sbit rw=P1^1; //read/write pin

sbit e=P1^2; //enable pin

sbit quat=P3^0; //pin connected to quater level of tank

sbit half=P3^1; //pin connected to half level of tank

sbit quat_3=P3^2; //pin connected to three -fourth level of tank

sbit full=P3^3; //pin connected to full level of tank

sbit spkr_on=P3^4; 

sbit spkr_off=P3^5; // pin to off speaker

 

void delay(int k) //delay function

{

int i,j;

for(i=0;i<k;i++)

  for(j=0;j<1275;j++);

}

 

void write(int j) //write function

{

rs=1;  //selecting command register

rw=0;  //selecting to write

P2=j;  //putting value on the pins

e=1;  //strobe the enable pin

delay(1);

e=0;

return;

}

 

void cmd(int j)  //command function

{

P2=j;  //put the value on pins

rs=0;  //selecting command register

rw=0;  //selecting to write

e=1;  //strobe enable pin

delay(1);

e=0;

return;

}

 

void puts(char *a) //puts function to print a string

{

unsigned int p=0;

for(;a[p]!=0;p++)

write(a[p]);

}

 

void lcd_init(void) // function to initialise the LCD

{

cmd(0x38); //setting 8-bit interface, 2 lines, 5*7 Pixels

delay(1);

cmd(0x0e); //turning on underline visible cursor

delay(1);    

cmd(0x01); //clearing screen

cmd(0x80); //moving cursor to the begining of line 1 of LCD

}

 

void main()

{

quat=half=quat_3=full=spkr_off=1; //configuring as input pins

quat=half=quat_3=full=spkr_off=0; //lowering input pins

spkr_on=1;    // making speaker on pin high,as it works on negative logic

while(1)

{

  while(quat==0&&half==0&&quat_3==0&&full==0&&spkr_off==0)   //condition when tank is empty

  {

   lcd_init();        // initialising LCD

   puts(“VACANT”);       //printing VACANT on lcd

  }

  while(quat==1&&half==0&&quat_3==0&&full==0&&spkr_off==0)         //condition when tank is quater

  {

   lcd_init();

   puts(“QUATER”);      //printing QUATER on lcd

  }

  while(quat==1&&half==1&&quat_3==0&&full==0&&spkr_off==0)         //condition when tank is half

  {

   lcd_init();     

   puts(“HALF”);      //printing HALF on lcd

  }

  while(quat==1&&half==1&&quat_3==1&&full==0&&spkr_off==0)         //condition when tank is three-fourth

  {

   lcd_init();

   puts(“3/4 FULL”);     //printing 3/4 FULL on lcd

  }

  while(quat==1&&half==1&&quat_3==1&&full==1&&spkr_off==0)         //condition when tank is full

  {

   lcd_init();

   puts(“FULL;CLOSE TAP”);     //printing FULL;CLOSE TAP on lcd

   spkr_on=0;// Enabling speaker

  }

  while(quat==1&&half==1&&quat_3==1&&full==1&&spkr_on==0&&spkr_off==1)//enabling high speaker_off pin

  {

   spkr_on=1;//disabling speaker

  }

}

}

 

 

I hope you can share your ideas. So, we can pass our project successfully. This is my first time to do the project using the microcontroller. so, please help me. Thank you

 

[Author]

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