Interfacing 16×2 LCD Character Problem

[Adeel]

Hello guys,

 

I am using AT89C51 IC with 16×2 LCD after so much research i got how to display text on LCD but now i stuck with a character problem.

 

i was making this project: http://www.engineersgarage.com/microcontroller/8051projects/interfacing-adc0831-circuit a

 

nd was done 90% only the problem is that the Characters on my LCD are not correct:

 

lets say i m sending “ADC OUTPUT”

 

in my LCD its showing me “A?C OQPPQP2”

 

even if i send only single character which is ‘d’ its show me ” ?` ”

 

i dont know how to fix this issue can anyone help me in that ? any c example fixing this issue ??

[Ashish Angural]

hey try this

 

#include<reg51.h>

#include<intrins.h>

#define data P1
 

sbitS1=P1^0;

sbitS2=P1^2;

sbit RS=P2^0;
sbit RW=P2^1;
sbit E=P2^2;

sbit A1=P0^0;
sbit B1=P0^1;
sbit C1=P0^2;
sbit D1=P0^3;

void ms_delay(unsigned int a)
{
 unsigned int i,j;
 for(i=0;i<a;i++)
 {
  for(j=0;j<70;j++)
  {
   _nop_();
  }
 }
}

void sec_delay(unsigned int a)
{
 unsigned int i,j;
 for(i=0;i<a;i++)
 {
  for(j=0;j<1000;j++)
  {
   ms_delay(1);
  }
 }
}

void lcd_cmd()
{
 data=ACC;
 RS=0;
 RW=0;
 E=1;
 ms_delay(10);
 E=0;
}

void lcd_data()
{
 data=ACC;
 RS=1;
 RW=0;
 E=1;
 ms_delay(10);
 E=0;
}

void lcd_initialize()
{
 ACC=0x38;
 lcd_cmd();
 ACC=0x38;
 lcd_cmd();
 ACC=0x38;
 lcd_cmd();
 ACC=0x06;
 lcd_cmd();
 ACC=0x0C;
 lcd_cmd();
}

void lcd_puts(unsigned char *a)
{
 while(*a!=’’)
 {
  ACC=*a;
  lcd_data();
  a++;
 }
}

void clkwise()
{
 unsigned char i;
 for(i=0;i<=5;i++)
 {
  A1=0;
  B1=C1=D1=1;
  ms_delay(250);

  B1=0;
  A1=C1=D1=1;
  ms_delay(250);

  C1=0;
  A1=B1=D1=1;
  ms_delay(250);

  D1=0;
  A1=B1=C1=1;
  ms_delay(250);
  }
}

void anticlkwise()
{
 unsigned char i;
 for(i=0;i<=5;i++)
 {
  D1=0;
  A1=B1=C1=1;
  ms_delay(250);

  C1=0;
  A1=B1=D1=1;
  ms_delay(250);

  B1=0;
  A1=C1=D1=1;
  ms_delay(250);

  A1=0;
  B1=C1=D1=1;
  ms_delay(250);
 }
}

void main()
{
 lcd_initialize();
 while(1);
  {
   if(S1==0)
   {
       ACC=0x80;
    lcd_cmd();
    lcd_puts(“MOTOR CLOCKWISE”);
    clkwise();
   }
   else if(S2==0)
   {
       ACC=0x01;
    lcd_cmd();
    ACC=0x80;
    lcd_cmd();
    lcd_puts(“MOTOR ANTICLOCKWISE”);
    anticlkwise();
   }
  }
 }

 

this code is for stepper motor and lcd intefacing take it as an example

 

[Adeel]

Hello,

 

Thank you so much for your reply, but i have solved my problem

 

problem was that i was using the Instruction Set for HD44780 and i have 162A Character LCD Module.

 

and becuz of having different Instruction set i was facing this problem, but its solved thank you so much.

 

 

also if you can help me in ADC 0831 i am trying to measure 220v what i need to do is :

 

Get the volts and checks if its 170 , 200 , 220 so i can do other steps on behave of this.

 

how can i get this ??? any idea

 

thank you

[nikhiljain]

you need to first step it down using a transformer than use a rectifier ciruit to convert into dc than feed to the adc. Choose components with proper rating.

[Author]

Posts