I'm using the dtostrf instruction to convert a float variable to string , but sometimesthe result returns the NANO string. A that is because of?, That condition returns NANO? I need to know when it returns this string to debug that time.

dtostrf return NANO

system April 17, 2014, 4:16pm 4

Do you mean "NaN", aka "Not a Number"?

What are you feeding it?