The soil moisture sensor module , built around the LM393 comparator, gives an active-low (L) level output when the soil is dry (determined by a pre-setted threshold value). This digital output (wet ...

Arduino soil moisture sensor schematic. Project source code. const int VAL_PROBE = 0; // Analog pin 0 const int MOISTURE_LEVEL = 250; // the value after the LED goes ON void setup() { Serial.begin ...

My soil-moisture reading was in the low 700s in soil that had around 30 percent moisture (according to a comparison with a commercial soil-moisture sensor), and 661 in a drier pot.

The sensor’s moisture element is unique because it works similar to a plant’s root by measuring water tension in its hydrophilic fabric-covered matrix material rather than the surrounding soil.

Soil moisture sensors can help farmers save water, by letting them know when their crops actually need to be watered. A new sensor could be particularly helpful, as it incorporates a special ...