However, one well-known issue with these sensors is that they have a shorter lifespan because they are constantly exposed to moisture. For this, you can connect the VCC pin of the module to Arduino’s 5V pin. Let’s hook up the soil moisture sensor to the Arduino. In our first experiment, we will read the analog output to estimate the level of soil moisture. Experiment 1 – Measuring Soil Moisture using Analog Output (A0) Please keep in mind that the analog output will vary depending on the voltage supplied to the sensor. It is recommended that the sensor be powered from 3.3V to 5V.
D0 becomes LOW when the moisture level exceeds the threshold value (as set by the potentiometer), and HIGH otherwise. AO (Analog Output) generates analog output voltage proportional to the soil moisture level, so a higher level results in a higher voltage and a lower level results in a lower voltage.ĭO (Digital Output) indicates whether the soil moisture level is within the limit.
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