convert sensor data to char format

Projects Programming
1

Hi every one.
I faced a problem and search too mach,but not find the solution for this case.
The problem is :
I need the output of a DHT11 sensor

float temp = dht.readTemperature();

to a char format like this :

char radiopacket[8] = "28.44";

So how can I convert ?
or tell me if there is a way to get sensor data in char format ...
Thanks

2

dtostrf

3

or sprintf

sprintf(radiopacket,"%.2f",temp);

hope that helps...

EDIT: not applicable if using ARDUINO IDE. see post#3

4

The Arduino IDE by default does not support floating point (%f) with sprintf().

Most people use dtostf() instead.

5

jremington:
The Arduino IDE by default does not support floating point (%f) with sprintf().

you learn something everyday.... :slight_smile:

6

It is possible to include the %f feature in sprintf() by linking the appropriate libraries, but most people don't take the trouble.

A search will reveal the required steps.

7

[Solved]
As friends say, I found that sprintf library is not complete in arduino and for float just gives "?" !!!
finally I found the answer with dtostrf
That is :

float temp = dht.readTemperature();
char radiopacket[8];
dtostrf(temp,2,2,radiopacket);

Thanks all for help