Arduino - Converting floating number into string using the dtostrf() function

This is a quick example of how to convert floating number to string in Arduino using the dtostrf() function.

Code

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//#include <stdlib.h> char char_f[8]; String str_f; float f; void setup() { Serial.begin(9600); // Starts the serial communication } void loop() { f = 0.0; while (f <= 200.00) { f = f + 1.11; Serial.print("Floating Number:"); Serial.print(f); Serial.print("- "); // //http://www.atmel.com/webdoc/AVRLibcReferenceManual/group__avr__stdlib_1ga060c998e77fb5fc0d3168b3ce8771d42.html dtostrf(f, 7, 2, char_f); str_f = ""; for (int i = 0; i < sizeof(char_f); i++) { str_f += char_f[i]; } Serial.print("String Number:"); Serial.print(str_f); Serial.println("-"); } f = 0.0; while (f >= -200.00) { f = f - 1.1; Serial.print("Floating Number:"); Serial.print(f); Serial.print("- "); dtostrf(f, 6, 2, char_f); str_f = ""; for (int i = 0; i < sizeof(char_f); i++) { str_f += char_f[i]; } Serial.print("String Number:"); Serial.print(str_f); Serial.println("-"); } }

Output

References:

Converting Float to string and character array in a few simple steps - arduino
http://www.instructables.com/id/Converting-Float-to-string-and-character-array-in-/?ALLSTEPS

Conversion functions for double arguments.
http://www.atmel.com/webdoc/AVRLibcReferenceManual/group__avr__stdlib_1ga060c998e77fb5fc0d3168b3ce8771d42.html

Float to Binary Conversion
http://www.binaryconvert.com/convert_float.html?decimal=045049

Part 2: Sending numeric data using App Inventor Bluetooth communications
http://appinventor.pevest.com/?p=569