In an afternoon I built a smart sensor that reads and displays soil ... and the other to ground through a 10kΩ resistor and to Arduino's analog pin A0. I did the same with the thermistor and ...

of the Arduino. Here is the test code that indicates the soil wet/dry conditions using just two LEDs (green & red). int GLED= 13; // Wet Indicator at Digital PIN D13 int RLED= 12; // Dry Indicator at ...