ESP8266 Community Forum

- Sun Nov 29, 2020 9:00 pm #89633 Hello,

When trying to print floating point numbers I get no output. Also, when trying so sprintf a float no conversion takes place. Is there a floating point library and if there is how do I enable it?

Thanks!

- Mon Dec 14, 2020 5:46 pm #89799 There's no float formats compiled into the SDK to keep it small. Simplest way is to use something like this - set the define to the maximum places your range will allow, and set the format string to the number you want to print:

Code: Select all#define DEC_PLACE_MULTIPLIER 10000

char * print_float_voltage(double d_voltage) {
  int32_t voltage = d_voltage * DEC_PLACE_MULTIPLIER;

  os_sprintf(buf, "V = %d.%04u",  voltage / DEC_PLACE_MULTIPLIER, abs(voltage) % DEC_PLACE_MULTIPLIER);
  return buf;
}

- Mon Jan 31, 2022 9:18 pm #93524 you can use tinyprintf with floating point support - its two files

https://github.com/st0ff3r/tinyprintf

- Tue Feb 01, 2022 11:36 am #93530 Hello, here is a discussion that you may find helpful
https://www.tutorialgateway.org/c-progr ... oat-value/