Arduino Soil Moisture Sensor Circuit

Digital mode interfacing arduino and soil moisture sensor to connect the soil moisture sensor fc 28 in the digital mode we will connect the digital output of the sensor to the digital pin of the arduino.

Arduino soil moisture sensor circuit.

The soil moisture sensor module built around the lm393 comparator gives an active low l level output when the soil is dry determined by a pre setted threshold value. We can adjust the threshold using the potentiometer in the sensor. This establishes power for the sensor. We connect vcc to 5v on the arduino board and gnd to gnd on the arduino.

All the 16 pins of the pcf8574 driver module are connected with the lcd pins. The sensor module contains a potentiometer with it which is used to set the threshold value. Here we connect 3 3v 5v of external power. The sensor has 4 terminals for connection vcc for power gnd analog output and digital output.

As you can see the circuit diagram is really simple. While monitoring the sensor gives us true or false condition with respect to measured moisture content in a soil. Vcc and ground are how the sensor gets the power it needs to operate. The arduino soil moisture sensor circuit we will build to read the moisture of soil is shown below.

This soil moisture sensor circuit is pretty simple. If you type in arduino soil moisture sensor into ebay you will see the complete type of sensor needed to build this circuit. Let s start with the i2c 16 2 lcd.