INTERFACING LCD TO 8051 BY Qurat-ul-ain

[Rogen Lee]

hellow Mr. Qaisar. The code that you given is having an error. Is there any solution about this so we can check if it is our circuit or the program is having a problem. Thanks.

[Rogen Lee]

Aaahmmm..about the IC number like the AT89S52, is it really different if I’m going to use other IC number instead of AT89S52?

[Qaisar]

hi lee. 

 i think u r using s52 . this code will for s52 too . 

tha above code is correct as i shown its simulating diagram  . i modified delay function .simulate this code now and run it on proteus . 

but plz follow the above diagram to run this code . 

 

 

 

#include <AT89X51.H>

 

#define lcd_data P2

sbit en=P0^1;

sbit rs=P0^0;

 

 

unsigned char z;

unsigned int i;

 

 

 

void delay(unsigned int time)

 {

   unsigned int i,j;

   for(i=0;i<time;i++)

   for(j=0;j<1275;j++);

   }

         void lcdcmd(unsigned char value)

        {

              lcd_data=value;

               rs=0;

  en=1;

  delay(100);

  en=0;

  return;

 }

 

void lcddata(unsigned char value)

{

  lcd_data=value;

rs=1;

en=1;

delay(100);

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);

 }

 

} 

 

[Syed Aameer]

if you are using Keil micro vision

 

then try this code

 

#include<reg51.h>

 

#define lcd_data_port P2

 

sbit rs=P1^0;

sbit rw=P1^1;//better to connect to ground and disable this pin

sbit en=P1^2;

 

void lcd_cmd(unsigned short temp);

void lcd_data(unsigned short temp);

void delay(unsigned int msec);

 

void main()

{

     lcd_cmd(0x38);

     lcd_cmd(0x06);

     lcd_cmd(0x0e);

     lcd_data(‘A’);

     delay(5);

    lcd_data(‘B’);

 

}

 

void lcd_cmd(unsigned short temp)

{

   lcd_data_port=temp;

   rs=0;

   rw=0;

   en=1;

   delay(2);

   en=0;

}

 

void lcd_data(unsigned short temp)

{

   lcd_data_port=temp;

   rs=1;

   rw=0;

   en=1;

   delay(2);

   en=0;

  

}

 

 

void delay(unsigned int msec)

{

   unsigned int i,j;

    for(i=0;i<msec;i++)

       for(j=0;j<1275;j++);

}

 

[werytretr]

if im using silicon labs and 8×2 lcd?

[sumankrishnachaparala]

any one have the code and circuit diagram for 

 lcd based digital alarm clock with digital thermometer using 8051 microcontroller (at89c51)

http://www.engineersgarage.com/microcontroller/8051projects/digital-clock-with-digital-thermometer-AT89C51-circuit

please send it to [email protected]

thank you in advance

 

[Rohil Verma]

i m doing a project using AT89C51 of digital clock, alarm and temp. sensing.. i connected all the components but there are only black boxes on the lcd. i checked it on the proteus software, it was working perfectly. what can i do to get the output? 

[Haizad]

Try to check the connection to the LCD. Make sure it was soldered properly. Try to adjust the contrast too

[Jaymin D]

Hello,

 

every one

 

few new thing about h/w and s/w

 

just try it it may be useful to all who have LCD problem

 

1. if u connect LCD with PORT 0 then connect 10K pull-up resistors with M/C

 

2. connect pin no. 5,1,16 of LCD to GND

 

3. connect pin n0. 2,15 to +ve 5 V

 

4. connect excet 10K variable resistor / pot / trimmer as middle pin with pin no. 3 of LCD

 

below is the sample code for display ” 16×2 character LCD ” on LCD screen

 

LCD is connect with PORT 2 and RS at pin 1 and EN at pin 2 of PORT 1 and RW is GND in my below code..

 

just assume this code and you also edit it as per your requriment..

 

#inclde<REG51.h>

#include<stdio.h>

 

#defoine lcd P2

 

sbit rs = P1^0;

sbit en = P1^1;

 

void cmd(unsigned char value)

{

lcd=value;

rs=0;

en=0;

en=1

}

 

void data(unsigned char value)

{

lcd=value;

rs=1;

en=0;

en=1

}

 

void main()

{

unsigned char a[]=”16×2 character LCD”;

unsigned int i;

 

cmd(0x38);

cmd(0x01);

cmd(0x06);

cmd(0x0E);

cmd(0x80);

 

for(i=0;a!=’’;i++)

{

data=a;

}

 

}

 

Thats all.

 

Hope you find this helpful

 

If any doubt then conatc me for support and buying any electronics components.

 

just google : DABHI ELETCRONICS

 

and email : project[dot]student123[at]gmail[dot]com

 

Best luck

 

Regards

 

Jaymin D

[Author]

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