A fucking datalogger

File: interp-img.jpg (190KB, 532x777px) Image search: [Google]

190KB, 532x777px

heres the graph.

I will buy a game of 10 dollars ( keys for cs go, whatever the fuck) just post the solution with a fake email and ill deliver some links with the shit

>>1200498
once it works ofc...

What part of the explanation you don't understand?

>>1200508
How to convert from Centibar to humidity percentage.

Hard becouse its not a linear function

>>1200517
You either fit some processor-friendly curve (polynomial) to it or approximate it with in piece-wise linear fashion.

>>1200525
How xD?

>>1200517
I'm not sure if there is an equation that correlates this quantity with humidity but I find that quite unlikely.
Anyway the only information given is that graph, which only holds experimental data that correlates soil suction and "water depletion %" (which I suppose is the inverse of relative humidity) for various kind of soil.

The best you can do, is to select the curve that better describes you soil and sample it obtaining a sequence of (x,y) values. When you get a new data point x from the sensor (i.e. a value of soil suction) you "guess" the corresponding value of % water depletion by interpolation on the dataset.

Note: sampling data from a low resolution semilogarithmic graph will most likely cause a noticeable error on higher values.

>>1200531
there are two decent software to extract data from scanned graphs:
http://markummitchell.github.io/engauge-digitizer/
http://getdata-graph-digitizer.com/

You can't do humidity but you can do soil moisture.

http://www.irrometer.com/basics.html

>>1200576
Which is what OP is after. But he wants someone else to do his homework. Not worth the 10 bux negro.