PT100_Calibration Formula

Using Arduino Programming Questions
1

Dear all.

Here I am attaching output of ADC along with Input Given from calibrator for PT100. I am looking for Equation that can provide 0.1 degree accuracy .Can someone suggest me equation based on the input provided.

i thought of using slope and intercept equation . Kindly give me some suggestion

0 - 400 degree
Degree_conv= 0.22701475595913734 * Adc_value - 1817.7071509648126;

-200 degree to 0 degree

Degree_conv= 0.03067484662576687 * Adc_value - 245.61349693251535;

-200 degree to 400 degree

Degree_conv= 0.07244626901714561 * Adc_value - 307.72760202849554;

Let me know any better equation based on reading & suggestion any

Pt100 Reading.txt (2.05 KB)

2

0.22701475595913734

However you do it, the average Arduino is not going to provide that level of accuracy

3

you could create a lookup table. loads are available out there... (one link here http://www.intech.co.nz/products/temperature/typert.html)