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Arduino Compatible Soil Moisture Sensor Module

Old Price: $2.36

Special Price: $1.18

Part Number: HP-ASE-SOIL

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Get creative with your friends and families

Make your own intelligent Garden with an optional digital plant moisture sensor/water pump controller that lights an LED to alert the user when it is time to water a potted plant, and/or turn on a water pump to quench the thirst, here is an Arduino Primer for you. No doubt, an Arduino can convert your favorite pots into self-watering planters, keeping your plants from drying out and reducing the time you spend watering. Self-watering system is ideal for people frequently on vacation, and takes the guesswork out of watering. Plants draw up moisture as they need it!

This sensor measures the volumetric content of water inside the soil and gives us the moisture level as output. The sensor is equipped with both analog and digital output, so it can be used in both analog and digital mode.

Included in the package:

  • Arduino Compatible Soil Moisture Sensor Module x 1


  • Input Voltage: 3.3 – 5V
  • Output Voltage: 0 – 4.2V
  • Input Current: 35mA
  • Output Signal: Both Analog and Digital

Pin Out – Soil Moisture Sensor:

The soil Moisture sensor FC-28 has four pins

  • VCC: For power
  • A0: Analog output
  • D0: Digital output
  • GND: Ground

Note: The Module also contains a potentiometer which will set the threshold value and then this threshold value will be compared by the LM393 comparator. The output LED will light up and down according to this threshold value.

Working of Sensor

The soil moisture sensor consists of two probes which are used to measure the volumetric content of water. The two probes allow the current to pass through the soil and then it gets the resistance value to measure the moisture value.

When there is more water, the soil will conduct more electricity which means that there will be less resistance. Therefore, the moisture level will be higher. Dry soil conducts electricity poorly, so when there will be less water, then the soil will conduct less electricity which means that there will be more resistance. Therefore, the moisture level will be lower.

This sensor can be connected in two modes; Analog mode and digital mode.

*This product is not produced or endorsed by Arduino.