Arduino Sprintf Float Not Formatting
Answer : Due to some performance reasons %f is not included in the Arduino's implementation of sprintf() . A better option would be to use dtostrf() - you convert the floating point value to a C-style string, Method signature looks like: char *dtostrf(double val, signed char width, unsigned char prec, char *s) Use this method to convert it to a C-Style string and then use sprintf, eg: char str_temp[6]; /* 4 is mininum width, 2 is precision; float value is copied onto str_temp*/ dtostrf(temp, 4, 2, str_temp); sprintf(temperature,"%s F", str_temp); You can change the minimum width and precision to match the float you are converting. As has been stated before Float support is not included in sprintf on Arduino. String class Arduino has its own String class. String value = String(3.14); then, char *result = value.c_str(); String class reference, link above Constructs an instance of the String class. There are multiple versions that construct Stri...