Improved Maths for the capacitive sensor HW-390: the entire 00-99 range on the 7-Segment-Displays will now be used.

Background: Capacitive sensor HW-390 delivers around 3.0V (here: approximately 65.535 after ADC conversion and expansion) output voltage when the soil is completely dry, and 1.0V (here: approximately 21.845 after ADC conversion and expansion) when the soil is completely wet. 

(Source of this schematic: Sensors | Free Full-Text | Characterization of Low-Cost Capacitive Soil Moisture Sensors for IoT Networks (mdpi.com) )