Hello
I have built a capacitive soilmoisture sensor.
And I have bought a reference hPa soil moisture sensor.
I basically want a formula so I can input a measurement from my capcitive sensor and it will then give me the hPa value as a result.
Heres is what I have done so far (don't know if it is right)
 I have placed the two sensors in the same soil pot, and I have collected some data.
 I then put the data into excel and made a best fit curve for each data set.
So now i have two best fit curves.
Can I calculate a calibration formula from this, and if so how?
(uploaded pics of the two best fit curves from sensor data)
I have built a capacitive soilmoisture sensor.
And I have bought a reference hPa soil moisture sensor.
I basically want a formula so I can input a measurement from my capcitive sensor and it will then give me the hPa value as a result.
Heres is what I have done so far (don't know if it is right)
 I have placed the two sensors in the same soil pot, and I have collected some data.
 I then put the data into excel and made a best fit curve for each data set.
So now i have two best fit curves.
Can I calculate a calibration formula from this, and if so how?
(uploaded pics of the two best fit curves from sensor data)
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