personal_username

any idea on how to calibrate a sensor ranging from 0 to 100 so that you can "freeze" your position and assign it a value of Zero?

Example: I'm detecting the gravity on one axis, and the value I want to set as the Zero Point is when I have the value "34" (ranging from 0 to 100).

What I want is to set the value "34" as the Zero point, and scale any future value to -50 and 50 (whereas "0" is, again, my defined input "34")

any idea on how to calibrate  a sensor ranging from 0 to 100 so that you can "freeze" your position and assign it a value of Zero?

Example: I'm detecting the gravity on one axis, and the value I want to set as the Zero Point is when I have the value "34" (ranging from 0 to 100).
What I want is to set the value "34" as the Zero point, and scale any future value to -50 and 50 (whereas "0" is, again, my defined input "34")

Hi all, 
any idea on how to calibrate  a sensor ranging from 0 to 100 so that you can "freeze" your position and assign it a value of Zero?


calibration-to-point-zero

[scale 34 100 -50 50] would seem like the thing?

thanks for the reply, but I need "34" to be "0", in your case it would be "-50".

Also it should take into account values below 34, and in your example it would fall below "-50"...

It looks very simple indeed (scaling and adding and subtracting the Zero value), but taking into account all the factors it is not that easy. At least I couldn't easily figure out.

I think/hope there is be a simple expression to do the job, but math is the elephant in the room in my life! ;-)

thanks for the reply, but I need "34" to be "0", in your case it would be "-50".
Also it should take into account values below 34, and in your example it would fall below "-50"...

It looks very simple indeed (scaling and adding and subtracting the Zero value), but taking into account all the factors it is not that easy.  At least I couldn't easily figure out.

Apologies, careless reading from me. So, am I right in understanding that you want: 

Did you want to have a mapping that is a smooth curve between these points, or two linear sections (0-34:-50:0 & 34-100:0:50)? 

Apologies, careless reading from me. So, am I right in understanding that you want: 
input 0 -> output -50
input 100 -> output 50 
input 34 -> output 0 

Did you want to have a mapping that is a smooth curve between these points, or two linear sections (0-34:-50:0 & 34-100:0:50)? 


"Apologies, careless reading from me" oh, actually thank you for taking the care of replying ;-)

"Apologies, careless reading from me" oh, actually thank you for taking the care of replying ;-)
very appreciated! 
btw:  linear is just fine ;-)


Does the below help? You can do two linear sections simply by using [split] in to two [scales] for each part of the mapping.

You can get a smooth curve using [scale] by finding the value of its curve parameter that gives you an output of 0 for an input of 34; you find that value either empirically (by twiddling until you get the right result) or algebraically. Other curve fitting techniques are available ;-)

 Does the below help? You can do two linear sections simply by using [split] in to two [scales] for each part of the mapping. 

You can get a smooth curve using [scale] by finding the value of its curve parameter that gives you an output of 0 for an input of 34; you find that value either empirically (by twiddling until you get the right result) or algebraically. Other curve fitting techniques are available ;-) 

So I guess this would be the patch with adjustable Zero Point, right? ;-)

Many thanks!
So I guess this would be the patch with adjustable Zero Point, right? ;-)

Calibration to point Zero