Re: Formula for calculating temp in C

On Mon, 27 Jun 2005 19:19:58 +0200, Huub <hdotvdotniekerkathccnetdotnl> wrote:

>Hi,
>
>Is there any formula for converting a given resistance of the (Siemens)
>NTC K164/1K5 into temperature in Celsius? I'm not familiar with
>components, but I need to use it in software.
>
>Thank you for helping.
>
>Huub

NTC thermistor functions are somewhat complex, and it is usually more efficient to use a lookup
table, with interpolation if necessary to reduce table size. The table will take less space than all
the floating point stuff you'd otherwise need.
You need some part-specific factors which should be in the data***.

This is an Excel formula for R->T a particular philips part :
=(1/(0.003353832+0.0002460382*LN(H7/$R$5)+0.000003405377*LN(H7/$R$5)^2+0.000000103424*LN(H7/$R$5)^3))-273.15
.