measure percentage

[hahaxuan]

we need to compare the data that get from daq with this table.

eg, if we get 12.5V , we should get 90% for futhrt calculation.

[hahaxuan]

But actually it isn't a straight line....we want a more accurate value just follow the table....

[P@Anand]

Did you give a try with what I have suggested?

[hahaxuan]

I get to know linear fit from NI website. But the data we have are not follow a straight line. We want to follow the table accurately. If use linear fit, it may have error. like when voltage eaquls 12.4V, SOC become 85% not 80%...

[apok]

did you do what christian has suggested....

and as you've said,"But the data we have are not follow a straight line"....again, the key word here: interpolate array

[GerdW]

Hi xuan,

as you struggle to follow advices given here and just started to create double posts in the forum (what is really bad!) I will show you a possible solution:

[hahaxuan]

could you please attach the vi here? I try to build the vi like the one you do but some of functions cannot find...

Thanks!!!

[GerdW]

Hi xuan,

which function?

SpeadsheetStringToArray? Any of the simple mathematics functions? Or one of those two array functions?

[altenbach]

Let us keep it to the basics. All you need is a calibration array of points aanndd "interpolate array". 😄

 

[hahaxuan]

Really thanks for your help!!!

But I need to get my voltage from a daq. While data for daq and Interpolate 1D are not the same so I convert daq data to a 1D array and use Index Array function to connect the element inside to the Interpolate 1D, but I don't know how to set the index no. of the Index Array.

Do you know how to connect my daq to the program???

Thank you again!!