Writing a float value to a file

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7

fmpc001:
After reviewing floattostring.h threads the suggested method is to use:

String tempC = dtostrf(celsius, 10, 2, 10);

Why would the suggested method be something that is wrong?

The parameters for dtostrf says that the last argument is a character-buffer. You passed a 10. The compiler is telling you that it expected the last argument to be a character array.

dtostrf(floatVar, minStringWidthIncDecimalPoint, numVarsAfterDecimal, charBuf);

So you probably wanted to do:
char buffer[14]; // 10 min string with, decimal, 2 characters after decimal, plus a \0
dtostrf(celsius, 10, 2, buffer);

Then print buffer.