How to interface 4bit mode LCD to 8051 Micro controller

[Ramu Rachakonda]

Please any body help me

[Anonymous]

its not that difficult if you know how to work in 8-bit mode. You just need to know how 4-bit Mode works for the LCD.

Refer http://www.engineersgarage.com/embedded/avr-microcontroller-projects/interface-lcd-4bit-mode-circuit to understand the 4-bit mode working.

[Ramu Rachakonda]

Hi very tanx for ur reply

 

 

 

 

 

 

 

i tried 4bit mode program but in LCD no display.

 

 

 

 

Actually my project is interfacing LM35 with C8052f120 Controller, so i interfaced LM35 to ADC of controller i got correct value in output side but that value i am not able to show in LCD so please help me.

 

 

 

with Regards

Ram.R

[dagakshay]

hi Ramu,

what problem you facing not gettin the number or not getting any display on LCD????…

the link given aforside is a very nice one and properly explain i tried it and its workin well… i ask you to check you connects ones aagin….

[Ramu Rachakonda]

Hi guys..

 

 

 I got LM35 interfacing to controller and 4bit mode LCD display successfully………..

 

 

 

 

 

Thanks.. 

[Ramu Rachakonda]

Hi guys..

 

 

 

can anybody tell me keyboard interfacing procedure bcoz of i am new to prgrmng…

 

 

Thanks.. 

[romel emperado]

here:

very good example and explanation

 

http://adf.ly/2Gy8n

[raju]

 sir i want to  4 bit lcd display how to interface and correct coding for 4bit interface with 8051.

[raju]

any one tell me where i mistake in code pleace see my code.

 

#include<reg51.h>
#include<stdio.h>

sbit rs=P3^7;
sbit en=P3^6;
#define port P1

void delayms(int delay);
void lcdcmd(unsigned char l);
void lcddata(unsigned char l);
void display(unsigned char *dr);
void delay(unsigned char s);
void lcd();
void enable();
void lcdint();

void enable()
{
en=0;
delay(100);
en=1;
}
void lcdcmd(unsigned char l)
{

int s;
rs=0;
s=l;
port=((l>>4)&0x0F);
enable();
delay(1000);
enable();
port=(s&0x0F);
enable();
//enable();

}

void lcddata(unsigned char l)
{
int s;
rs=1;
s=l;
port=((l>>4)&0x0F);
enable();
delay(1000);
enable();
port=(s&0x0F);
enable();
//enable();

}

void display(unsigned char *dr)
{

while(*dr)
{
lcddata(*dr++);
}
}

void delay(unsigned char s)
{
while(s–);
}
void lcd()
{
port=0xFF;
enable();
delayms(7);
port=0x30;
enable();
delayms(5);
port=0x30;
enable();
delayms(5);
port=0x30;
enable();
delayms(5);
port=0x20;
enable();
delayms(5);

}
void lcdint()
{
lcd();
lcdcmd(0x28);
delay(100);
lcdcmd(0x0C);
delay(500);
lcdcmd(0x06);
delay(500);
//lcdcmd(0x01);
delay(500);

}

void main()
{

while(1)
{

lcdint();
lcdcmd(0x80);
lcddata(‘a’);
}
}

void delayms(int delay)
{

int i ;
for(i = 0 ; i<delay ; i++)
{
TMOD=0x01;
TH0 = 0xFC ;
TL0 = 0x17 ;
TR0 = 1 ;
while(!TF0);
TR0 = 0 ;
TF0 = 0 ;
}
}

[AJISH ALFRED]

Hi Raju,

Post your schematic and the trouble you are having with the code

[kunal]

 

#include<reg51.h>

#define port P3            //14,13,12,11 pins of lcd and 1.7,1.6,1.5,1.4 of controller

 

#define lcdport P1

sbit rs = port^0;

sbit rw = port^1;

sbit en = port^2;

 

void lcd_ini();

void dis_cmd(unsigned char);

void dis_data(unsigned char);

void lcdcmd(unsigned char);

void lcddata(unsigned char);

void Delay_ms(unsigned int msec) ;

 

void main()

{

unsigned char data0[]=”rocks”;

unsigned int i=0;

lcdport=0;

 

lcd_ini();

while(data0!=’’)

{

dis_data(data0);

Delay_ms(20);

i++;

}

}

void lcd_ini()                    

{

dis_cmd(0x02);

dis_cmd(0x28);

dis_cmd(0x0C);

dis_cmd(0x06);

dis_cmd(0x80);

}

 

void dis_cmd(unsigned char cmd_value)

{

unsigned char cmd_value1;

cmd_value1 = (cmd_value & 0xF0);

lcdcmd(cmd_value1);

cmd_value1 = ((cmd_value<<4) & 0xF0);

lcdcmd(cmd_value1);

}

 

 

void dis_data(unsigned char data_value)

{

unsigned char data_value1;

data_value1=(data_value&0xF0);

lcddata(data_value1);

data_value1=((data_value<<4)&0xF0);

lcddata(data_value1);

}

 

void lcdcmd(unsigned char cmdout)

{

lcdport=cmdout;

rs=0;

rw=0;

en=1;

Delay_ms(10);

en=0;

}

 

void lcddata(unsigned char dataout)

{

lcdport=dataout;

rs=1;

rw=0;

en=1;

Delay_ms(10);

en=0;

}

  void Delay_ms(unsigned int msec) 

{

int i,j ;

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

  for(j=0;j<1100;j++);

  }

[arpan jain]

How to interface keyboard with 8051
Can u please provide the code for the same

[umar farrok]

why you are trying with 4 bit better you try with 8 bit temperature sensor lm 35 temp range starts from -50 to 150 degree so assign it with 8 bit character value using 16×2 lcd 

 

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