Used to measure the volumetric water content of soil
How does a Soil Moisture Sensor work?
1. Fork-shaped probe with two exposed conductors acts as a variable resistor
2. Resistance varies inversely with soil moisture
3. Sensor produces an output voltage according to the resistance
4. Measuring the output voltage determines the soil moisture level
Soil Moisture Sensor
Consists of two parts: Probe and Module
Probe acts as a variable resistor with resistance varying according to soil moisture
Module connects the probe to the Arduino board and generates an output voltage based on the resistance of the probe
Parts of Soil Moisture Sensor Module
Analog Output (AO) pin
Digital Output (DO) pin
Potentiometer for adjusting sensitivity of digital output
Power LED
Status LED
Analog Output (AO)
Generates analog output voltage proportional to the soil moisture level
Digital Output (DO)
Indicates whether the soil moisture level is within the limit (LOW when moisture level exceeds threshold, HIGH otherwise)
It is recommended to power the sensor from 3.3V to 5V, as the analog output will vary depending on the voltage supplied
To avoid accelerated corrosion, it is recommended to turn on the sensor only when taking readings by connecting the power pin to a digital pin on the Arduino and setting it to HIGH or LOW as needed
Give the four (4) pinouts of SOIL MOISTURE RENSOR?
