Discussion in "Project Addition or Changes" started by    adambose1990    Oct 11, 2011.
Tue Oct 11 2011, 12:02 PM
#1
Hi guys, here is a simple project I have done in 89s52 IC of 8051 series. Making a Digital Clock.


Components required:
1 microcontroller 89C52(89S52 will also do)
2 ceramic capacitors-22pF
1 switch(button for reset purpose)
1 electrolytic capacitor-10uF,25V
1 crystal oscillator-11.0592MHz
16x2 LCD display
1 resistor-10k


Software you will need:
The programming of the microcontroller is done using keil compiler. Port 2 is output port, This LCD is in 8bit mode.
Details of LCD you can have here.

http://www.mikroe.com/eng/chapters/view/17/chapter-4-examples/

Circuit Diagram:



The detail explanation of the code is done below:


//main.c
#include <REG51.H>

#include "lcd.h"

void ms_delay(int time)
{
	unsigned int i,j;
	for(i=0;i<time; i++)
		for(j=0;j<=1275;j++);
}

void main(void)
{   
   	int hr=00,min=00,sec=00,flag=0;
	LCD_init();
   	LCD_putnum(hr,2);		   //|HH:MM:SS 	AM
   	LCD_sendstring(":");
	LCD_putnum(min,2);
	LCD_sendstring(":");
	LCD_putnum(sec,2);
	LCD_sendstring("  AM");
   while(1)
   {
	for (sec=0;sec<60;sec++)
    {				
		LCD_gotoxy(6,0);
		LCD_putnum(sec,2);
		ms_delay(142);
		if (sec==59)
	    { 
			min=min+1;
			if(min==60)
			{
		  		if(hr==11&&sec==59)
		    	{
					hr=0;
					min=0;
					sec=-1;
					flag=~flag;
					LCD_gotoxy(0,0);
					LCD_putnum(hr,2);
					LCD_gotoxy(3,0);
					LCD_putnum(min,2);
					LCD_gotoxy(10,0);
					if (flag==0)
						LCD_sendstring("AM");
					else
						LCD_sendstring("PM");
				}
		  		else
				{   
					hr=hr+1;
					min=0;
					LCD_gotoxy(0,0);
					LCD_putnum(hr,2);
					LCD_gotoxy(3,0);
					LCD_putnum(min,2);
				}
			}
			LCD_gotoxy(3,0);
			LCD_putnum(min,2);
	    }
	} 
   }		
}


But before that you have to make lcd.h file. Its codes are given also here. This Header is specially made for this program.
//lcd.h
#ifndef __LCD_H__
#define __LCD_H__

#define LCD_data P2


void _LCD_busy(void);
void _LCD_sdelay(void);
void _LCD_poweron(void);
void _LCD_command(unsigned char);
void _LCD_senddata(unsigned char);
void _LCD_sendstring(unsigned char *);
void _LCD_putnum(int, int);
void _LCD_init(void);
void _LCD_clear(void);

sbit LCD_rs=P1^0;
sbit LCD_rw=P1^1;
sbit LCD_en=P1^2;

void LCD_busy()
{
    unsigned char i,j;
        for(i=0;i<50;i++)
                for(j=0;j<255;j++);
}

void LCD_sdelay()
{
    unsigned char i;
        for(i=0;i<50;i++);
}

void LCD_poweron()
{
unsigned int i;
for (i=0;i<22500; i++);
}

void LCD_command(unsigned char var)
{
     LCD_data  = var;      //Function set: 2 Line, 8-bit, 5x8 dots
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in instruction register
     LCD_en   = 1;        //Enable H->
L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
}

void LCD_putnum(int number,int width)// LCD_putnum: Implementing integer value from -99999 to 99999
{
   unsigned char digit;

   if (number < 0) 
   {
     LCD_senddata('-');
	 LCD_sdelay();
	 number = -1 * number;
   }

   switch (width)
   {
   		case 5:
			digit = '0';
			while(number >
= 10000)                // Keep Looping for larger than 10
   			{
     			digit++;                         // Increase ASCII character
     			number -= 10000;                    // Subtract number with 10
   			}
			LCD_senddata(digit);                // Put the Second digit
			LCD_sdelay();
	   case 4:
			digit = '0';
			while(number >
= 1000)                // Keep Looping for larger than 10
   			{
     			digit++;                         // Increase ASCII character
     			number -= 1000;                    // Subtract number with 10
   			}
			LCD_senddata(digit);                // Put the Second digit
			LCD_sdelay();
		case 3:
			digit = '0';
			while(number >
= 100)                // Keep Looping for larger than 10
   			{
     			digit++;                         // Increase ASCII character
     			number -= 100;                    // Subtract number with 10
   			}
			LCD_senddata(digit);                // Put the Second digit
			LCD_sdelay();
		case 2:
			digit = '0';
			while(number >
= 10)                // Keep Looping for larger than 10
   			{
     			digit++;                         // Increase ASCII character
     			number -= 10;                    // Subtract number with 10
   			}
			LCD_senddata(digit);                // Put the Second digit
			LCD_sdelay();
		case 1:
			LCD_senddata('0' + number);           // Put the First digit
			LCD_sdelay();
   }
}

void LCD_sendstring(unsigned char *var)
{
     while(*var)              //till string ends
       LCD_senddata(*var++);  //send characters one by one
}

void LCD_senddata(unsigned char var)
{
     P2  = var;      //Function set: 2 Line, 8-bit, 5x7 dots
     LCD_rs   = 1;        //Selected data register
     LCD_rw   = 0;        //We are writing
     LCD_en   = 1;        //Enable H->
L
     LCD_en   = 0;
     //LCD_busy();          //Wait for LCD to process the command
}

void LCD_init(void)
{
     LCD_data = 0x38;     //Function set: 2 Line, 8-bit, 5x8 dots
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->
L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
     LCD_data  = 0x0C;     //Display on, Curson blinking off command
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->
L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
     LCD_data  = 0x01;     //Clear LCD
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->
L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
     LCD_data  = 0x06;     //Entry mode, auto increment with no shift
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->
L
     LCD_en   = 0;        //Enable H->
L
     LCD_busy();
}

void LCD_clear(void)
{
	LCD_data  = 0x01;     //Clear LCD
    LCD_rs   = 0;        //Selected command register
    LCD_rw   = 0;        //We are writing in data register
    LCD_en   = 1;        //Enable H->
L
    LCD_en   = 0;
    LCD_busy();
}

     
void LCD_gotoxy(int x, int y)//x=0..16, y= 0..1 
{      
  int dr;
  if (y==0)
  	dr=x+0x80;      
  if (y==1)       
    dr=x+0xC0;            
  LCD_data  = dr;      //Function set: 2 Line, 8-bit, 5x8 dots
  LCD_rs   = 0;        //Selected command register
  LCD_rw   = 0;        //We are writing in instruction register
  LCD_en   = 1;        //Enable H->
L
  LCD_en   = 0;
  LCD_busy();        
}

#endif


Thanks a lot...
For any quarries you can contact [email protected]
Tue Oct 11 2011, 12:09 PM
#2
You can download the following attachents
.Hex file
.H file
.C file
.DSN file
They are all in rar file. Extract them all.
Attachment
Tue Oct 11 2011, 04:05 PM
#3
@ adambose1990
good efforts
use timer for clock that will be more accurate as compare to looping
Thu Oct 13 2011, 03:51 PM
#4
good work adambose

and i completely agree with Majoka, you must use timers for tick generation. I will be much more accurate
Fri Oct 14 2011, 04:31 PM
#5
@Ajay Bhargav yes surely, This project is not accurate only because of the tick generation, it lags a few second in an RTC hour, I surely will follow your advice, thanks........:)
Tue Nov 01 2011, 08:20 PM
#6
Additional advice for error free timers; use timer in free running mode so that you dont have to do load operation for timers. This way your timer will always overflow at perfect intervals, no matter how late your ISR is serviced

Also use 12Mhz for best results with above method.
Thu Nov 03 2011, 12:04 PM
#7
Thanks a lot Ajay sir...:)
Sun Nov 06 2011, 07:17 AM
#8
You're welcome good luck for your Final Year
Fri Feb 10 2012, 10:26 AM
#9
Its a good and lot of information on your site and good collection of information for digital 8051. thanks for sharing the information.
Fri Feb 10 2012, 11:15 AM
#10
Hi jamewhite86, To know more digital 8051, have a look into this site : www.rsatechbook.webs.com
There is a lot not only about 8051, but also about AVR and PIC unique projects...... Have a good day...
http://rsatechbook.webs.com/

Get Social

Information

Powered by e107 Forum System

Conversation

Tue Nov 29 2016, 02:49 PM
jaykumar
Dear sir, elevator microprocessor control , the vendor locked the control, pls help me how can we decode the password
Sat Nov 26 2016, 10:24 AM
manikanta B
hello i know about gsm,gps and zigbee but i dont know how to use them while programming. can anyone suggest me how to use them
ExperimenterUK
Sat Nov 19 2016, 07:09 PM
@Protaz.. Really you would be better off asking on one of the many Arduino user sites
Fri Nov 18 2016, 05:39 AM
Protaz
Hi, am new in programing, but I have few skills in electronic. I want to make an automatic timing system for institutions using arduino uno. Any one to assist me how to program the microcontoller?
Tue Nov 15 2016, 04:45 AM
Hemangi patel
hello, i am working on atmega128 board and i want to interface with sd card with using fat32 file system. i am totaly new in this field .so pls anyone can u suggest me some imp links.thanks
Thu Nov 10 2016, 01:40 PM
ajith raj
hi frds i make voice control robot using blutooth module
Wed Oct 26 2016, 08:23 AM
ishalt
is it possible to completly get the robot running from java code
Sun Oct 23 2016, 05:50 PM
mamata thakur
plz send full mini project report for ic 741&ic 555 tester
Wed Oct 19 2016, 03:30 PM
riddhi1296
can you provide an explanation for the inverter 8051 code and how it works
ExperimenterUK
Sat Oct 15 2016, 12:15 AM
@snaya. Create a thread in the 8051 forum for your questions

Downloads

Comments

Jonathan.kei
Mon Nov 21 2016, 04:30 PM
AVRuser1
Sun Nov 20 2016, 06:07 PM
JaguarPaw
Thu Nov 17 2016, 07:44 PM
PeterJohn
Mon Nov 14 2016, 05:54 PM
evigna
Wed Nov 02 2016, 02:03 PM
ozancakiroglu
Thu Oct 27 2016, 01:54 PM
[email protected]
Fri Oct 21 2016, 10:35 PM
Beliwars
Sat Oct 15 2016, 09:40 AM

Online

Guests: 45, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 37792
Newest member: Jonathan.kei
Forum Activity
Centurio Avatar
Posted By Centurio
Mon Nov 28 2016, 08:46 AM
Hi there,long time ago... i've a short question to...
kirangowle Avatar
Posted By kirangowle
Wed Nov 16 2016, 03:56 PM
Hello Forum members,After a long time i am back to...
Pratik_Suthar Avatar
Posted By Pratik_Suthar
Thu Oct 13 2016, 12:39 PM
@martin the HEX file provided in the project is no...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Oct 06 2016, 06:15 AM
Hi Phil, Do you want to add this to existing proje...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Oct 06 2016, 06:13 AM
CE should be high when you go for reading mode/wai...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Oct 06 2016, 06:03 AM
You can also use ESP8266 with its SDK to write app...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Oct 03 2016, 11:15 PM
This is an old thread and the links no longer work...
martinsnc115877 Avatar
Posted By martinsnc115877
Wed Sep 14 2016, 12:51 PM
sir, i did your led scrolling mass display, and it...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Sep 09 2016, 11:45 PM
The Hex file for this project is a bit too big for...