wireless soil humidity sensor with aurdino

[niloofar]

hi,

I'm planning to create a wireless soil humidity sensor with aurdino but I have a big problem I've got two sensors one is yl-69 and the other is watermark sensor. these two sensors are not calibrated the watermark has additional adaptor for its calibration but it is expensive for the student project and without that i didn't get any stable output when i measure it with rlc meter. the yl-69 has a non-linear output and I have to estimate the graph to the linear. I want to show the percantage of soil humidity on pc. so my question is how can calibrate it or how can write the program for non-linear analog output? 

I'm so appriciate if you answer my question.

[Prabakaran P M]

My suggestion for this is to create a algorithm which will sample the non-linear output of sensor and give the humidity periodically, averaging of values can be done.

[niloofar]

acually I have 1 kilograms a type of soil and every 10 minutes I add 10 grams of water and measure the output, it is voltage output but it is not same in every test. what do you mean about the averaging? for example in one of my test differences between every added water, the outputs are like this: 0.1-0.4-0.3-0.5-0.2-0.6-0.9

the other one in the same situation are like this: 0-0.3-0-0.3-0.5-0.5-0-0.8

what is your suggestion now?

thanks

[Author]

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