Arduino dtostrf() Function
To convert a floating-point number to a character array in Arduino Programming, we need dtostrf() function In this article, I will share how to use this function Arduino Convert Float To Char Array.
If you are still confused about the difference between a char array and a string, you can read about it in the Arduino Char Array vs String Explanation article.
The dtostrf() function is not part of the standard C library, so it is specific to Arduino. It takes four arguments:
- The floating-point number to be converted
- The width of the field in which the number will be printed
- The precision of the number, or the number of digits after the decimal point
- The character array in which the converted number will be stored
How to use it
Here’s an example of how you might use dtostrf():
float pi = 3.14159265; char result; dtostrf(pi, 5, 2, result);
This will convert the value of pi to a character array, with a width of 5 characters and a precision of 2, and store the result in the result array. The resulting character array will contain the string “3.14”.
- The dtostrf() function is inefficient, and it can take up a lot of memory if you convert a large number of floating-point numbers. If you need to convert many numbers, you may consider using a different method.
- The dtostrf() function does not support scientific notation. If you need to convert a number in scientific notation, you will need to use a different method.
Hopefully, this Arduino Convert Float To Char Array article can be helpful.
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