thank you for your reply. It makes me happy
If I can help you again, let me know.

Cheers
Peter

I would like to thank you for helping me with this.I didn’t respond right away because, I wanted to familiarize myself closer with WinAVR and makefile generation. Yes, you were right, the problem was in configuration of printf in the makefile. I generated the makefile again with the WinAVR mfile application, and with it a compiled your code, and run the ISIS simulation. Everything works like a charm now.

Thank again,
Cheers,
Srdjan

I see, it’s a problem to post lines with angle brackets in it. The first three lines are the normal includes with angle brackets:


#include <avr/io.h>
#include <stdio.h>
#include <util/delay.h>

Cheers
Peter

the code-snipped is ok, but I think, you must change a little bit in your Makefile. Search in the Makefile the following line:
#PRINTF_LIB = $(PRINTF_LIB_FLOAT)
Delete the “#” at the beginning of the line and save the Makefile. Here comes the whole code again:


#include <avr/io.h>
#include <stdio.h>
#include <util/delay.h>
#include "lcd.h"

int main(void)
{
LCDInit(LS_NONE);
LCDClear();
myflt1 = 3.14159;
myflt2 = myflt1*5.1324;
sprintf(mystr, "%.3f", myflt2);
LCDWriteString(mystr);
}


In the line:
sprintf(mystr, “%.3f”, myflt2);
you can define the number of decimal places.

Info: I’m working with WinAVR

Hope it helps
Peter

Thank you very much on the reply.
I tried the code you provided, but I don’t get result as expected. I have run the simulation in Proteus ,and I keep getting ? on the screen. So it doesn’t prints the decimal number I want, but just the prints ?. can you please help with this,my programing skills in C are still not very good,I am learning.

Thanks,
Srdjan

1. You have to change the integer (or float) to a string.
Code-snipped:

int main(void){
char mystr[16];
double myflt1, myflt2;
myflt1 = 3.14159;
myflt2 = myflt1*5.1324;
sprintf(mystr, “%.5f”, myflt2);
LCDWriteString(mystr);
}

sprintf makes this change. This string can be displayed at the LCD. Use the function “LCDWriteString(const char *msg);” from the library.

2. Your second problem is a little bit difficulter. One idea you’ll find at
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=128191
Search in Google to “atmega8″ and “lm35″.

Cheers
Peter

first of all,thank you for making this great library and very very good tutorials on the subject of micro-controllers.I have two question for you if you can please answer:
1.How to print a number other than integer on the LCD display (for example 25.5 or so)? What should I modify in the lcd source code?
2. How to measure temperature with LM35 and Atmega8 but to have increments in half of the degree (for example measure temperature of 18.5 degrees Celsius)? Because as I can see in your tutorial of interfacing LM35 with Atmega8 you have resolution on one degree.

Thank you!

Cheers
Peter

Pay us the cost and get assembled and tested hardware.

Then only we can proceed.

I am using your code and have connected terminals in same manner as described in your article, i am using ATMEGA328P-PU. LCD backlit gets lit but nothing gets displayed.

Please help..

Thanks,

Ujjwal Soni

this is not a problem, but a info to you. A good idea is, to take the following line in your main.c sourcecode:
#define F_CPU 8000000UL /*CPU clock in Hertz*/
You must write the right frequency of your CPU in the line.

Second, your main-function should begin with a:
int main(void)
{
…..

I hope, it helps.

Cheers
Peter

For that you need to have good understanding of C.

is it possible, to use a 8×1-module with your lcd-library?

Sincerely
PeterS