Version 1.0
©Copyright 2020, Ambient LLC. All Rights Reserved.
Page 5
different soil types and density.
The calibration equation is defined as:
% Soil Moisture (calibrated) = (Now AD – 0%AD) *100 / (100%AD – 0%AD)
Where AD stands for “analog to digital” and is the unscaled digital value measured by the sensor,
Now AD is the currently measured AD and the other parameters are described below.
5.3.1
0% Soil Moisture Set Point
To determine the 0% soil moisture, collect a soil sample in a cup from where the sensor will be
installed, and allow the soil to completely dry out. Next, place the soil sensor in the medium and allow
the sensor to stabilize for 24 hours.
Next, set the
0%AD
calibration set point to the
Now AD
value.
5.3.2
100% Soil Moisture Set Point
To determine the 100% soil moisture, collect a soil sample in a cup from where the sensor will be
installed, and add water and mix until the soil is saturated, and there is no standing water. Next,
place the soil sensor in the medium and allow the sensor to stabilize for 24 hours.
Next, set the
100%AD
calibration set point to the
Now AD
value.
Figure 4
Once the 0%AD and 100%AD are entered, set
Customize
to
ON
. To return to the non-calibrated
settings, set
Customize
to
OFF
. Select
Reset
to restore to factory default.