ESP8266 Community Forum

Posted: **Thu Nov 10, 2016 7:19 pm**

Using a NodeMCU1.0 board with a BME280 for a little project. The BME280 returns values for temp, humidity, and dew point with decimals such as 74.14 F. I want to trim the output of that so it just shows 74 F or at least 74.1 F. Does anyone know how I can do that? I looked throught eh BME280-master library I am using but no help. Thanks.

Posted: **Fri Nov 11, 2016 12:03 pm**

Not an ESP8266 issue but anyway;

If you want to store the output in a char array:

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float val = 74.14;
char array[10];
sprintf(array, "%.1f", val);    // %.1f  for 1 decimal, %.2f for 2 decimals etc 
// array contains your "new" value as a char array.

if you just want an integer: (just truncates, no rounding)

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float val = 74.14;
int new_val = (int) val;

if you just want to print to serial:

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float val = 74.14;
int n = 1 // number of decimals
Serial.print(val,n);

Posted: **Sun Nov 13, 2016 12:38 am**

Thank you very much. I also found a StringRemove command.

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