NEED HELP with Data Acquisition System With LCD 16*2

[Ahmed]

Hi every one

 

I have a problem with DAQ system and LCD. The problem is i receved the data from ADC0808 and put it in array but can’t display it on LCD!!!

I notes that port0 (P0) don’t get out the data so i used spisific data like string or number but the same problem accured???

i think there is something wrong with the program!

 

i used AT89C52 becuase of 8K EEPROM

I upload both Software and simulation (Proteus  Version 7.6 SP0)

 

Any Help Or Suggestion

Thanks

 

This is the Program and simulation

http://www.4shared.com/rar/1g-IcdOC/ADCLCD.html

 

And This is the program here:-

 

#include <REGX52.H>

sbit start=P3^3;

sbit end=P3^4;

sbit oe=P3^5;

sbit ale=P3^6;

sbit clock=P3^2;

 

unsigned char sensor=0,reading[7];

//

---

LCD writing

---

sfr lcd_data_pin=0x80;  // data port P0

sbit rs=P1^3; // Register select pin

sbit rw=P1^4; // Read write pin

sbit en=P1^5; // Enable pin

 

long int b=0; //for math operation

int j,num[4];   //num to carry 5 digit

 

void delay(unsigned int msec)

{

int k,l;

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

for(l=0;l<1275;l++);

} 

void initSerial()

{

TMOD=0x22;

TH1=0xFD;

//SCON=0x50;

TR1=1;

EA=1;

} 

void usDelay(int a)

{

TH0=256-(a/1.085);

TR0=1;

ET0=1;

}

void timerRoutine() interrupt 1

{

clock=~clock;

}

 

void latch()

{

ale=0;

delay(2);

ale=1;

 

}

void startConv()

{

delay(2);

start=0;

delay(2);

start=1;

}

void wait()

{

while(end==1);

}

void get()

{

delay(2);

oe=0; 

delay(2);

oe=1;

}

 

//

---

LCD Display Function

---

 

void lcd_command(unsigned char comm) // function to send command to LCD

{

lcd_data_pin=comm;

en=1;

rs=0;

rw=0;

delay(1);

en=0;

}

 

void lcd_ini()     //Function to inisialize the LCD

{

lcd_command(0x38);   

delay(5);

lcd_command(0x0F);       

delay(5);

lcd_command(0x80);

delay(5);

}

 

void lcd_data(unsigned char disp)    // function to send data on LCD

{

lcd_data_pin=disp;

en=1;

rs=1;

rw=0;

delay(1);

en=0;

}

 

lcd_dataa(unsigned char *predisp)    // function to send string to LCD

{

int x;

for(x=0;predisp[x]!=0;x++)

{

lcd_data(predisp[x]);

}

}

 

void lcd_data_int(unsigned int vote)  //Function to send 0-9 character values (Divide number into 5 digits)

{ 

char dig_ctrl_var;

int p;

for (j=4;j>=0;j–)

{

  num[j]=vote%10;

  vote=vote/10;

}

j=1;  

for (p=0;p<=4;p++)

{

  dig_ctrl_var = num[p]+48;

  lcd_data_pin = dig_ctrl_var;

  rw = 0;

  rs = 1;

  en = 1;

  delay(1);

  en = 0;

  if(j==1)

  {

  lcd_data(0x2E);

  j=2;

  }

}

return;

}

 

void main()

{

int i;

initSerial();

usDelay(50);

while(1)

 {

 

P=0;

for(i=0;i<8;i++)

{

 

if(sensor==

{sensor=0;}

P1=(P1&0xf8)+sensor;

latch();

startConv();

wait();

get();

reading=P2;

sensor++;

}

 

//

---

LCD man Program

---

lcd_ini();

{

lcd_dataa(“Eng Ahmed”);

lcd_command(0xC5);

b=(100)*196+(0x00);

lcd_data_int(b);

 

delay(200);

b=0;

lcd_command(0x01);

}

 }

}

 

 

 

[Harsh Pandya]

well , have you connected pull-up resistors on port 0 ? because port zero doesnot have an internal pull-up like other 3 ports

[Ahmed]

Hi Harsh Pandya

 

Your answer so right i put 10K pull up resistance and it’s worked good… Thanks Pro.

 

And another discussion in this link if any one need more information.

 

http://www.engineersgarage.com/forums/8051/pull-resistor

 

 

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