Resistance to Temperature

[RRR2]

Hi,

I´m trying to make a conversion table, to read a temperature.

I already have the table in paper, but i can´t make in C.

What I´m trying to do is this:

Read the ADC-> Calc the RESIT. -> and them go to a table get the values.
On that table need (based on the previous calculated resistance) the closest lower value, the closest higher value, and the closest lower temperature.

Them with this I can calculate the temperature using interpolation,
(measured value - closest lower value)* resolution in ºC
----------------------------------------------------------------- + closest lower temperature
closest higher value - closest lower value)

Example:

My table on paper:
ºC-------Ohms
... -------....
5 -------101.95
10-------103.9
15-------105.85
20-------107.79
....-------.........

So lets say I have calculated a resistance of 104 Ohms.
I need to get from table the value 103.9 Ohms, 105.85 Ohms and 10ºC.

How can i make this?
Where direction i have to take?
I´m begin to write in C, and i don´t have the necessary skills to do this, or where start.


Thank´s in advance.

[PICoHolic]

One solution is to do interpolation.
One way is to get the slope and the offset between the two points where your value belongs and consider it as linear.Apply your value and get the temperature.

Good Luck...