[SOLVED] Displaying float value with more than 4 decimal points on LCD

[paulfjujo]

hello,

this kind of conversion will not work in every cases
example in post #16 will work only for value > 0 and < 99.9999
bad if 0.3244 => gives 00.3244 and bad for 199.1234 => gives 99.1234

example in post #20 is the same case , not cover all values..
and you must add 0x30 or '0' to the digit value to get an ascii

Lcd_chr(4,3,0+digit);
  must be
  Lcd_chr(4,3,'0'+digit);

i suppose your Lcd_chr as parameters as ( line number, caractere position, caractere)
and when you use Lcd_chr_cp('.'); you write on the current cursor position ?
Do you have automatic increment of cursor inside your LCD init ?

so a lot of pending probem !

my last opinion about this thread.. use the code in post #7
allready tested in many application..
Check if you have automatic increment of cursor after writing a car on the LCD.
To write the ascii result of float
Put the cursor at the begining of a line
after just use Lcd_chr_cp(car);, no need to put again line number and X position.

unsigned char CRam1[32];
float F1;
int k;

.. see float conversion in post #7 ....

F1=0.3244;

....

fltToa(F1,CRam1,4);  // 4 decimales
k=strlen(CRam1;

// put here LCD function to put the cursor position at line 4,0
...... 
for (i=0;i<k;i++)
{
 Lcd_chr_cp(CRam1[i]);
}

 

[ADGAN]

Ok thanks. These functions are built in MiroC pro. I guess they have auto increment function. I'll try again the code in post #7.

 

[ADGAN]

I tried your code but the fprintf is not available in MikroC

- - - Updated - - -

I tried zsolt1's method it seems to be easy to understand. Its working fine. So thought of using his method. Thank you very much zsolt1.

void Energydisplay(double V){

  unsigned char a,b,c,d,d1,d2,d3,d4;
  double n;
  
   a=V/1000;
   b=(V-(1000*a))/100;
   c=(V-(1000*a)-(100*b))/10;
   d=V-(1000*a)-(100*b)-(10*c);
   n=(V-(1000*a)-(100*b)-(10*c)-d)*10000;
   d1=n/1000;
   d2=(n-(d1*1000))/100;
   d3=(n-(d1*1000)-(d2*100))/10;
   d4=n-(d1*1000)-(d2*100)-(d3*10);
   
   Lcd_Chr(4,5,a+48);
   Lcd_Chr(4,6,b+48);
   Lcd_Chr(4,7,c+48);
   Lcd_Chr(4,8,d+48);
   Lcd_Chr_CP('.');
   Lcd_Chr(4,10,d1+48);
   Lcd_Chr(4,11,d2+48);
   Lcd_Chr(4,12,d3+48);
   Lcd_Chr(4,13,d4+48);
   }

 

[ADGAN]

One problem, it displays some garbage data when v=0000.000, how do I solve it?

- - - Updated - - -

I solved it in the following way. This is my new code:

void Energydisplay(double V){

  unsigned char a,b,c,d,d1,d2,d3,d4;
  double n;
   if(v==0000.00){
   Lcd_Chr(4,5,48);
   Lcd_Chr(4,6,48);
   Lcd_Chr(4,7,48);
   Lcd_Chr(4,8,48);
   Lcd_Chr_CP('.');
   Lcd_Chr(4,10,48);
   Lcd_Chr(4,11,48);
   Lcd_Chr(4,12,48);
   }
   else{
   a=V/1000;
   b=(V-(1000*a))/100;
   c=(V-(1000*a)-(100*b))/10;
   d=V-(1000*a)-(100*b)-(10*c);
   
   n=(V-(1000*a)-(100*b)-(10*c)-d)*10000;
   d1=n/1000;
   d2=(n-(d1*1000))/100;
   d3=(n-(d1*1000)-(d2*100))/10;

   Lcd_Chr(4,5,a+48);
   Lcd_Chr(4,6,b+48);
   Lcd_Chr(4,7,c+48);
   Lcd_Chr(4,8,d+48);
   Lcd_Chr_CP('.');
   Lcd_Chr(4,10,d1+48);
   Lcd_Chr(4,11,d2+48);
   Lcd_Chr(4,12,d3+48);
  }
   }

Any ideas that I can make it simple?

 

[zsolt1]

One problem, it displays some garbage data when v=0000.000, how do I solve it?

- - - Updated - - -

I solved it in the following way. This is my new code:

void Energydisplay(double V){

  unsigned char a,b,c,d,d1,d2,d3,d4;
  double n;
   if(v==0000.00){
   Lcd_Chr(4,5,48);
   Lcd_Chr(4,6,48);
   Lcd_Chr(4,7,48);
   Lcd_Chr(4,8,48);
   Lcd_Chr_CP('.');
   Lcd_Chr(4,10,48);
   Lcd_Chr(4,11,48);
   Lcd_Chr(4,12,48);
   }
   else{
   a=V/1000;
   b=(V-(1000*a))/100;
   c=(V-(1000*a)-(100*b))/10;
   d=V-(1000*a)-(100*b)-(10*c);
   
   n=(V-(1000*a)-(100*b)-(10*c)-d)*10000;
   d1=n/1000;
   d2=(n-(d1*1000))/100;
   d3=(n-(d1*1000)-(d2*100))/10;

   Lcd_Chr(4,5,a+48);
   Lcd_Chr(4,6,b+48);
   Lcd_Chr(4,7,c+48);
   Lcd_Chr(4,8,d+48);
   Lcd_Chr_CP('.');
   Lcd_Chr(4,10,d1+48);
   Lcd_Chr(4,11,d2+48);
   Lcd_Chr(4,12,d3+48);
  }
   }

Any ideas that I can make it simple?

you don't need anymore d4?
Ps: it is a good practice to declare variables initializing them at the same time by 0 like
unsigned char a=0,b=0,c=0,d=0,d1=0,d2=0,d3=0,d4=0; this way you can be shore that everything starts from 0 ....
48 decimal is the character '0' in ascii, so when you send to the display the value (48+y)dec, if y\[\in\][0 .......9], you can display the caracters from 48 to 57 from the table , any other value for y wil display something else (check ascii table on the net)

 

[ADGAN]

Yes d4 won't be necessary. Ok thanks.

 

[jayanth.devarayanadurga]

Big Float value using mikroC.

https://www.mikroe.com/forum/viewtopic.php?f=13&t=32369

I converted it to display Integers.