[51] lcd is working in proteus but not working in hardware, UC is AT89c51

[Er_pank]

lcd JHD 162A is working in proteus but not working in hardware, we are using Atmel AT89C51 microcontroller. The display occurs momentarily sometimes(rarely 1 or 2 times) but again the LCD turns back into showing bars. We've tried several methods like using simple programs for displaying "Hello" , "WALLE" etc. But again the same problem.

Here's the code for displaying "WALLE"

#include<regx51.h>
#define RS P1_7
#define RW P1_6
#define EN P1_5
#define DATA P2

void delay(int n);
void ins(void);
void dat(void);
void latch(void);

void main(void)
{
		   	
	 int k=0;
	 char x[6]="WALLE";
	 
		
             
             delay(100000);
             ins();
             DATA=0X38; //8-bit Databus, Set 2 lines, and Select font size 5x7
             latch();
             DATA=0X0F;// It will display the characters, will display the cursor and it will blink.
             latch();
             DATA=0X10; // Set cursor on line 1. Use 0xC0 to write on line 2.
             latch();
             DATA=0X0; //Before changing to write data select. Make port 2 =0x0 so that LCD receives nothing
			 dat();
			 latch();
             for(k=0;k<=5;k++)
             {
                         DATA=x[k];
                         latch();
             }
			 while(1);
         
	  

           
}

void delay(int n)
{
 int i=0,j=0;
 for(i=0;i<=n;i++)
 for(j=0;j<=10;j++);
}

void ins(void) //Instruction select routine
{
             RS=0;
             RW=0;
}
void dat(void) // Data select routine
{
            RS=1;
            RW=0;
}
void latch(void) // Latch routine
{
            EN=1;
            delay(1000);
            EN=0;
            delay(1000);
}

Diagram is given here:



https://obrazki.elektroda.pl/1332797100_1382441491.gif

 

[jayanth.devarayanadurga]

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Code C - [expand]
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ins();
DATA=0X38; //8-bit Databus, Set 2 lines, and Select font size 5x7
latch();
ins();
DATA=0X0F;// It will display the characters, will display the cursor and it will blink.
latch();
ins();
DATA=0X10; // Set cursor on line 1. Use 0xC0 to write on line 2.
latch();
ins();
DATA=0X0; //Before changing to write data select. Make port 2 =0x0 so that LCD receives nothing
latch();
 
for(k=0;k<=5;k++)
{
dat();
DATA=x[k];
latch();
}

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[mathespbe]

Use proper delay... Dely must be the problem here...

 

[nick703]

i think your circuit diagram is wrong . because JHD 162A has pin no. 4 , 5 , 6 is RS , RE , E is connected to the micro-controller pin no 10,11 and 16 which is PORT3 of 89c51 and in your code u mentioned port 1 something wrong or not?

 

[jayanth.devarayanadurga]

Yes. pin connections are wrong. Have to put a resistor on pin 15 or 16.

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Code C - [expand]
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#define RS P3_0
#define RW P3_1
#define EN P3_6

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[Jigar 4 Electronics]

It should be like this:

 

[Er_pank]

Thanks for your suggestion, will implement it.

what might be the proper time delay for this uC, and how to calculate the time delay ?

 

[ratheeshvaram@yahoo.com]

2 ms will be good...