# Params(R25, Beta) hash function

Valid for use with hash command: Thermistor

The resistance versus temperature response of an NTC thermistor can be mathematically approximated by using 2 parameters in an equation. We take care of the equation; you just have to supply the two parameters.

The parameters are R25 and Beta. R25 is the nominal resistance at 25ºC, in Ohms. Beta is a measure of the non-linear temperature curve. Sometimes Beta is given as Beta(25/85) or for some other temperature range. Here's a snippet of a typical data sheet:

If you were for example using the 5th thermistor from the top in this data sheet, you would have

Params(10000, 3977)

Note that the data sheet gives Kilo-Ohms, whereas we want ohms. 1 Kilo-Ohm = 1000 Ohms.