Speedometer cum odometer using AT89S52

[speedo]

Good day , i have this project which requires us to make a digital speedometer and odometer and used AT89S52. I have tried it on Proteus (ISIS) simulator and is actually working. However, i am having a problem implementing it in breadbord and/or PCB. i am quite sure that all my connections were correct and all are according to the schematic diagram. i dont have any background in programming a microcontroller such as AT89S52 and i think i am having problems with the codes. the LCD display is only displaying boxes. please help me with this problem.thank you.

 

this is the code

 

Main

 

#include”at89x52.h”

#include”lcd.h”

#include<24cxx.c>

unsigned char val=0x00;

unsigned int distance=0,speed=0,cal=0;

unsigned char km=0,t=0;

void timer0(void) interrupt 1

{

t++;

distance=distance+100;

if(distance==1000)

{

km=km+1;

t=0;

distance=0;

}

}

void one_sec()

{

unsigned int i,j;

for(i=0;i<120;i++)

{

for(j=0;j<1271;j++)

{

;

}

}

}

void display(int num)

{

unsigned char t,u,f;

t=num%10;

num=num/10;

u=num%10;

num=num/10;

f=num%10;

lcd_data(‘0’+f);

lcd_data(‘0’+u);

lcd_data(‘0’+t);

}

void bintoascii(unsigned char value)

{

unsigned char x,d1,d2,d3,a,b,c;

x=value/10;

d1=value%10;

d2=x%10;

d3=x/10;

a=0x30|d1;

b=0x30|d2;

c=0x30|d3;

lcd_data(‘ ‘);

lcd_data(c);

lcd_data(b);

lcd_data(a);

lcd_com(0xc0);

lcd_puts(“KM: “);

display(km);

lcd_puts(” MT: “);

display(distance);

}

void main()

{

unsigned char c=0,d=0;

T1=1;

T0=1;

TMOD=0x66;

TH0=206;

TL0=206;

TH1=0;

TL1=0;

TR0=1;

P1=0xFF;

IE=0x82;

RW24XX(&c, 1, 1, 0xA1, M2404);

RW24XX(&d, 1, 4, 0xA1, M2404);

t=d;

km=c;

distance=t*100;

c=0;d=0;

lcd_init();

lcd_com(0x01);

lcd_com(0x0C);

lcd_com(0x80);

while(1)

{

TR0=1;

val=TL0;

TL1=0;

TR1=1;

one_sec();

speed=TL1;

TR1=0;

cal=(speed*7);

lcd_com(0x80);

lcd_puts(“Speed “);

display(cal);

lcd_com(0x89);

lcd_data(‘ ‘);

bintoascii(val);

if(speed==0)

{

c=km;

d=t;

RW24XX(&c, 1, 1, 0xA0, M2404);

RW24XX(&d, 1, 4, 0xA0, M2404);

}

if(P1_4==0)

{

while(P1_4!=1);

c=0;

RW24XX(&c, 2, 1, 0xA0, M2404);

}

}

}

 

[mohamed abbas]

are you sure you download firmware in your chip with correct crystal frequency ?

[AJISH ALFRED]

Suggest you to try the following:

Connect an extra LED in series with a 330 ohm resistance to any of the GPIO pin and the other end to ground.

Burn any simple LED blinking code; If the LED blinks then we are sure that the code is running on the microcontroller and there is any issues regarding the crystal, firmware and all.

Now burn any simple LCD display code and observe how the LCD respond. If there is no response then check your LCD connections again.

[speedo]

Sir Ajish Alfred thank you for the reply. i would really like to check if the lcd/microcontroller is working but i dont how to program simple codes to test it. i only downloaded the codes l.can i just use this LED Blinker code i have downloaded in the internet?

 

#include <REGX51.H> // it is the header file of AT89S52 µcontroller
#define LEDPORT P2     // define PORT P2

void Delay(void); //Function prototype declaration

void main (void) {

while(1) //End less while so that program never ends
{
LEDPORT = 0×55; //01010101 binary
Delay();
LEDPORT = 0xaa; //10101010 binary
Delay();
}
}
void Delay(void)
{
int j; int i;
for(i=0;i<10;i++) // for() loop
{
for(j=0;j<10000;j++); // delay loop
{
}
} }

 

thank you again sir

 

[speedo]

Sir Mohamed Abbas i am sure that i used the correct crystal frequency which is 11.0592MHz . thank you for the reply

[mohamed abbas]

this is sample code. try to burn it at microcontroller and give us feedback.

[speedo]

ok sir i will try it tomorrow. By the way this is the schematic diagram that im using for the project. i have used AT89C52 here because AT89S52 is not available in Proteus(ISIS) which i used to simulate the circuit.and luckily it is working just fine.also the circuit and codes(i posted earlier) is working even if i use AT89C51. can i ask how it is possible? wysiwyg_imageupload:7217:thank alot for helping me

[mohamed abbas]

in your case yes because they have the same pin configuration

[speedo]

oh i see, that settles it.also they belong to 8051 family. how about the “include <AT89X52> or the library ” do i need to change that if i will use AT89C51? if yes how can i do that? ive tried many times changing it but errors occurs whenever i convert it to hex file using KeilUvision. thanks again for your tym

[mohamed abbas]

you will use the same header file

 

#include <REGX51.H>

 

but may be the problem you not change the microcontroller you can do it from menu project then choose select device …. and choose your microcontroller

[speedo]

i understand but i have done it many times before but still error occurs. or am i missing something?

[mohamed abbas]

what is the message of error ?

[speedo]

wysiwyg_imageupload:7235:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Build target ‘Target 1’
compiling main.c…
MAIN.C(1): error C103: ‘<string>’: unclosed string
MAIN.C(1): error C141: syntax error near ‘<string>’
main.c(1): warning C318: can’t open file ‘<REGX51.H’
main.c(1): error C305: unterminated string/char const
LCD.H(17): error C202: ‘P2_0’: undefined identifier
LCD.H(18): error C202: ‘P2_1’: undefined identifier
LCD.H(19): error C202: ‘P2’: undefined identifier
LCD.H(20): error C202: ‘P2_2’: undefined identifier
LCD.H(22): error C202: ‘P2_2’: undefined identifier
LCD.H(30): error C202: ‘P2_0’: undefined identifier
LCD.H(32): error C202: ‘P2_1’: undefined identifier
LCD.H(35): error C202: ‘P2’: undefined identifier
LCD.H(36): error C202: ‘P2’: undefined identifier
LCD.H(37): error C202: ‘P2_2’: undefined identifier
LCD.H(39): error C202: ‘P2_2’: undefined identifier
LCD.H(42): error C202: ‘P2’: undefined identifier
LCD.H(43): error C202: ‘P2’: undefined identifier
LCD.H(44): error C202: ‘P2_2’: undefined identifier
LCD.H(46): error C202: ‘P2_2’: undefined identifier
LCD.H(50): error C202: ‘P2_0’: undefined identifier
Target not created

 

i just changed the include <AT89X52> to #include <REGX51.H>  and then change the device from At89S52 to At89C51 is that the correct way to do that. im so sorry i really dont have any idea about mcu programming

[mohamed abbas]

you write

 

#include “<REGX51.H>”

 

it’s sure wrong. the correct writing

 

#include <REGX51.H>

 

without “

[amit kulkarni]

this is one of the part of my project. i am done with this part and its working well too.. but programming is in assembly language.

[Author]

Posts