tmp, or temperature

Given in °C, based on the Steinhart-Hart equation used for thermistors.

\[T = \dfrac{1}{Y} - 273.15\]

where

\[Y = c_0 + c_1 \cdot X + c_2 \cdot X^2 + c_3 \cdot X^3\]

and

\[X = ln(\dfrac{1}{R} - 1)\]