Arduino MKR Therm Shield Not Measuring Temperatures Below 0 °C

[markd833]

My first thought would be that there's a problem in the library you are using with a mix-up between signed and unsigned variables.

I've no experience of the MKR boards myself but I wonder if it may possibly be an issue with the serial printing routine, as I seem to recall reading some time back that serial print didn't like floats much.

You could test this by using sprintf to print the value to a null terminated c string and then use serial print to print out the resulting text.

EDIT: There may be an issue with sprintf too.

This discussion might help - see the dtostrf() function:

Sprintf() a float number

hi there I have a float number, say 6.38. I want to show that on a screen with one floating point. so I used the code below char str_tmp[5]; sprintf(str_tmp,"%2.1f",6.38); I expect to get 6.3 but looks like the code line above, rounds up 6.38 to 6.4 and then shows it with one floating point... how can I get 6.3 and not 6.4 ? I dont want the foating number to round up...