Newbie Question (1 of lol) (Strings/Floats)

Projects Networking, Protocols, and Devices
1

bmp085_read_temperature_and_pressure(&temperature,&pressure);
pressure = pressure - 10696; //adjust for sea level

client.print("The Temperature Is ");
client.print(temperature,DEC);
client.println();
client.print("The Barometer Reading: ");
client.print(pressure,DEC);
client.println();

The output looks something like this. "The Temperature Is 239 The Barometer Reading: 10334"

Now my issue, it's not 239 degrees in here nor is the pressure reading 10334, infact.. it's 23.9c and the pressure is 1033.4. How exactly do i get a . into the string? (simply insert a . and send it as a string) ..

Thanks :slight_smile:

(p.s Really enjoying Arduino, just that my background is in Pascal not C and it's a little difficult to adjust)

2

char c;
int temperature;
long pressure;

Incase you were wondering.

3

You could try to include Stdio.h into your code "#include <stdio.h>" in here is a function called sprintf and also printf (stands for print formatted) which can be used to print strings in a specified format

See here: http://www.c-for-dummies.com/lessons/float2string/
In here there's a tutorial for working with sprintf where he has a float which is pi, he divides this by 2 and can print it out as a string with the '.'

#include <stdio.h>

int main()
{
   	float pi = 3.141596;
   	char halfpie[80];
   	pi/=2;

   	sprintf(halfpie, "%f", pi);
    printf("Here is the result: %s\n", halfpie);
  	 return 0;
}

This returns

Here is the result: 1.570798

Here's a link for working with sprintf

Also here's the arduino's own page on working with printf and sprintf
http://arduino.cc/playground/Main/Printf

Finally here's a better guide on the parameters ("%s" etc..) for these two functions

http://www.cplusplus.com/reference/clibrary/cstdio/printf/ for printf
http://www.cplusplus.com/reference/clibrary/cstdio/sprintf/ for sprintf

Hopes this helps :stuck_out_tongue: