I have been testing and calibrating different soil moisture sensors over the past month. I understand Hydrosys4 assumes a linear trendline from the air to water measurement + an offset. The hydrosys4 linear equation is based on only 2 points (max and min). In reality to get true accuracy soil moisture sensors, i need to understand the trendline closer to the moisture level that i expect.. One example of a generic analog sensor, the linear equation is (-0.5339x) + 131.89 ; x being the reading from an adc port. The hydrosys4 would have (-0.6993x) + 171.33 --- based on range of 235 and 102. At a 114.2 reading hydrosys4 would calculate a moisture at 91% but in reality it is 71%. A simple offset of 20 would not work for other level of readings. The question that i have what python program(s) do i need to look at to modify such equation? Keep in mind each family of sensors will have its specific calibration equation while adding the complexity of the MCU / devices we used for the readings. For now i am using chirpstack to process the equation but would like to get hydrosys4 to do it.