Soil Moisture Sensor Module Q4 C16

 

When purchased, a single unit of soil moisture sensor module will be shipped with the sensor probes and the measurement module. The sensor probe will be dipped in the soil and connected to the measurement module. The measurement module will compare the measured value with the set threshold value (can be set using 10k pot) using the LM393 OP-Amp comparator and provide output on the digital pin. Both the sensor probe and measurement module is shown below.

Soil Moisture Sensor Module Pinout

 

Specifications of the Soil Moisture Sensor

Operating voltage (Vcc): 3.3V to 5V

Analog Output voltage: 0 to 4.2V@ Vcc = 5V

Digital Output Voltage: 0V or 5V @ Vcc=5v

Current consumption: 32mA

 

Because of the presence of the onboard Lm393 comparator circuit, you can also directly use the soil moisture sensor in your project without connecting a microcontroller unit (MCU) to it. When the moisture content of the soil is higher than the threshold value, the digital output of the moisture sensor is logic 0 (0V). The output from the digital pin can be used to drive an LED or a buzzer circuit.

You can also connect the Digital and Analog Output pins with a microcontroller like Arduino to built measure and monitor the soil moisture sensor and build interesting projects.

 

Dimensions of the Soil Moisture Sensor

Soil Moisture Sensor Dimensions

 

Additional Resources

Interfacing Soil Moisture Sensor with Arduino

Automatic Plant Irrigation using Arduino

IoT based Smart Farming using Arduino