Even if you’re connecting it using a header strip, the wires, components, sensors and accessories ... side of the adapter with a screw terminal for each pin. The perfect way to connect wires ...

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 ...

The microcontroller-based concept was chosen because I wanted to scale the sensor system later to suit other applications. Here is the diagram of my Arduino infrared close ... the D13 signal output ...