Moisture Sensor (SKU:SEN0114)

From DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot


This Gravity: Analog Soil Moisture Sensor For Arduino can read the amount of moisture present in the soil surrounding it. It's a low tech sensor, but ideal for monitoring an urban garden, or your pet plant's water level. This is a must have tool for a connected garden!

This moisture sensor uses the two probes to pass current through the soil, and then it reads that resistance to get the moisture level. More water makes the soil conduct electricity more easily (less resistance), while dry soil conducts electricity poorly (more resistance).

It will be helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden.


  • Power supply: 3.3v or 5v
  • Output voltage signal: 0~4.2v
  • Current: 35mA
  • Pin definition:
    • Analog output(Blue wire)
    • GND(Black wire)
    • Power(Red wire)
  • Size: 60x20x5mm
  • Value range:
    • 0 ~300 : dry soil
    • 300~700 : humid soil
    • 700~950 : in water


Moisture sensor Connection diagram
  # Example code for the moisture sensor
  # Editor     : Lauren
  # Date       : 13.01.2012
  # Version    : 1.0
  # Connect the sensor to the A0(Analog 0) pin on the Arduino board
  # the sensor value description
  # 0  ~300     dry soil
  # 300~700     humid soil
  # 700~950     in water

void setup(){

void loop(){
  Serial.print("Moisture Sensor Value:");

Open the Arduino Serial Monitor, and choose its baud rate 57600 as set in the code.

DFR0355 serial monitor in Arduino IDE.png

SEN0114 serial monitor Observe.png


DFshopping car1.png Shopping online from Gravity: Analog Soil Moisture Sensor For Arduino or DFRobot Distributor.

Related category: DFRobot > sensors & modules > sensors > Temperature & Humidity Sensor