how to display ADC values to 16×2 LCD

[romel emperado]

guys i have problem on converting my ADC output values to String and display it to 16×2 LCD.. Im using keil compiler.. i have the code and its almost done…

#include <REG51.H>

#define adc_port P3
#define LCD P2
#define LCD_EN        0x80
#define LCD_RS        0x20

sbit ale=P1^0;  //address latch enable
sbit oe=P1^3;  //output enable
sbit sc=P1^1;  //start conversion
sbit eoc=P1^2;  //end of conversion
sbit clk=P1^7;  // clock

sbit ADD_A=P1^4;  // Address pins for selecting input channels.
sbit ADD_B=P1^5;
sbit ADD_C=P1^6;

//LCD Commands       

#define LCD_SETMODE       0x04
#define LCD_SETVISIBLE       0x08
#define LCD_SETFUNCTION       0x28
#define LCD_SETDDADDR       0x80
                    

void delayms(unsigned char);
void delayus(unsigned char);
void lcd_init();
void lcd_reset();
void lcd_cmd (char);
void lcd_data(unsigned char);
void lcd_str (unsigned char*);

void timer0() interrupt 1  // Function to generate clock of frequency 500KHZ using Timer 0 interrupt.
{
clk=~clk;
}

void delay(unsigned int count)  // Function to provide time delay in msec.
{
int i,j;
for(i=0;i<count;i++)
  for(j=0;j<1275;j++);
}

void select_channel(char c,char b,char a)
{
  ADD_A = a;
  ADD_B = b;
  ADD_C = c;
}

void convert()
{
  delay(1);
  ale=0;      //activate the ale PIN
  ale=1;
  sc=1;         //initaite convertion
  sc=0;
  delay(1);

}
void read_adc()
{

   while(eoc == 0);     //end of convertion
   oe = 1;             //enable adc output
   delay(1);
   oe = 0;
   delay(1);

}

void main()
{

 

  adc_port = 0xff;
 
  TMOD =  0x22;  //timer0 setting for generating clock of 500KHz using interrupt enable mode.
  TH0  =  0xFD;
  IE   =  0x82;
  TR0  =  1;
  lcd_init();

 while(1)
 {
  
   select_channel(0,0,1);
   convert();
   read_adc();

  
   lcd_cmd(0x80);            // 1st line address
   lcd_str(“WindV: ” );

   lcd_cmd(0xC0);              // 2nd line address
   lcd_str(“BattV: “);
  

 }
}

void delayus(unsigned char delay)
{
    while(delay–);
}

void delayms(unsigned char delay)
{
    while(delay–)
    delayus(149);
}

void lcd_reset()
{
    LCD = 0xFF;
    delayms(40);
    LCD = 0x03+LCD_EN;
    LCD = 0x03;
    delayms(40);
    LCD = 0x03+LCD_EN;
    LCD = 0x03;
    delayms(5);
    LCD = 0x03+LCD_EN;
    LCD = 0x03;
    delayms(5);
    LCD = 0x02+LCD_EN;
    LCD = 0x02;
    delayms(5);
}

void lcd_init ()
{
    lcd_reset();
    lcd_cmd(LCD_SETFUNCTION);                    // 4-bit mode – 1 line – 5×7 font.
    lcd_cmd(LCD_SETVISIBLE+0x04);                // Display no cursor – no blink.
    lcd_cmd(LCD_SETMODE+0x02);                   // Automatic Increment – No Display shift.
    lcd_cmd(LCD_SETDDADDR);                      // Address DDRAM with 0 offset 80h.
 }

 void lcd_cmd (char cmd)
{
    LCD = ((cmd >> 4) & 0x0F)|LCD_EN;
    LCD = ((cmd >> 4) & 0x0F);

    LCD = (cmd & 0x0F)|LCD_EN;
    LCD = (cmd & 0x0F);
    delayus(250);
    delayus(250);
}

void lcd_data (unsigned char dat)
{
    LCD = (((dat >> 4) & 0x0F)|LCD_EN|LCD_RS);
    LCD = (((dat >> 4) & 0x0F)|LCD_RS);
   
    LCD = ((dat & 0x0F)|LCD_EN|LCD_RS);
    LCD = ((dat & 0x0F)|LCD_RS);
    delayus(250);
    delayus(250);
}

void lcd_str (unsigned char *str)
{
    while(*str)
    {
        lcd_data(*str++);
    }
}

[dagakshay]

to display the numbers on LCD you have to add 48 in the asii number..
for example you have unsigned char i=1;
LCD_write(i+48);

just try that…(i din’t put my hand in your magii….. {code})… 

[romel emperado]

why it is displaying weird characters?
float volt;

   volt = ((volt * 5)/256) * 4.2;
   lcd_data(volt+48);

pls give some example.. this is my first project…

[dagakshay]

http://www.engineersgarage.com/microcontroller/8051projects/display-number-LCD-AT89C51-circuit 

[romel emperado]

it’s now okay.. I just use mikroC builtit Library.. hehe

[dagakshay]

using inbuilt library is a good option but you must know how actully the thing works…

[romel emperado]

yeah.. i might know that if you teach me.. hehe

[dagakshay]

mha pleasure….

[shruthikandakatla]

can u please mail me the circuit diagram for this code…

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