Generic 8B13 Soil Moisture Sensor & Soil Hygrometer Detection Module

Adjustable sensitivity, Dual output mode (Analog & Digital), Fixed bolt hole for easy installation, Power and digital switching output indicators, LM393 comparator chip for stability, Surface plating for corrosion resistance, Automated watering system capability, Low power consumption (8mA), 3.3V-5V operating voltage

It is recommended that the sensor be powered from 3.3V to 5V. The analog output will vary depending on the voltage supplied to the sensor. Constantly applying power to the sensor while buried in soil significantly accelerates the rate of corrosion, leading to a shorter lifespan. To avoid this, it is recommended that the sensor be turned on only when taking readings. One easy way to do this is to connect the sensor’s power pin to a digital pin on an Arduino and set it to HIGH or LOW as needed. The total power drawn by the module (with both LEDs lit) is about 8 mA, so powering the module from a digital pin is fine. Connect the A0 pin to the Arduino’s A0 ADC pin. To estimate the soil moisture level, record the values of your sensor output when the soil is as dry as possible and when it is completely saturated. This test may require some trial and error. Normally, readings should be taken perhaps once or twice a day.