Schematic Soil Moisture Sensor Arduino Circuit Diagram

Here is a project of a versatile and very sensitive moisture sensor circuit.

Schematic soil moisture sensor arduino circuit diagram.

The sensor module contains a potentiometer with it which is used to set the threshold value. We have interfaced the moisture sensor with arduino uno board. When the soil is dried no current will flow through it and it works like an open circuit. The soil moisture is monitored in real time.

The circuit diagram for this is very simple. A 12volt dc water pump is controlled as the soil moisture increases or decreases below a certain pre defined value. Digital mode interfacing arduino and soil moisture sensor. This digital output wet soil l dry soil h is routed to one i o terminal d2 of the arduino microcontroller.

The circuit does not have a current limiting resistor because the base resistor is very high and the current through the transistor is only 2ma. This is very simple and interesting circuit for electronics lovers. Working of the sensor head electronics is self explanatory so just follow the conceptual drawing and schematic drawing shown in fig. This soil moisture sensor circuit can be used in many applications like automatic plant irrigation system greenhouse projects etc.

Soil moisture sensor works on the principle of open and closed 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. Now lets interface the capacitive soil moisture sensor with oled display arduino and display the analog value or soil moisture value in percentage. Circuit diagram of the digital soil moisture meter front end of the digital soil moisture meter is a simple soil moisture sensor head built around a few easily available parts.

In this project we are going to build a transistor based simple soil moisture detector circuit. When soil is moist the current will start flowing from one terminal to another working as a closed circuit. Capacitive soil moisture sensor arduino in this tutorial you will learn how to use the capacitive soil moisture sensor v1 2 with arduino and display the soil moisture value on a 16 2 i2c lcd module. I have given below soil moisture sensor circuit diagram.

In the schematic from left we have our soil moisture sensor which is connected to a driver board preety much any soil moisture sensor comes with a driver board example soil moisture meter soil humidity sensor. In the previous circuits of moisture sensors like plant soil moisture tester circuit or moisture sensor alarm. In this circuit we have used an npn transistor to detect soil moisture. The circuit can be used to detect moisture in any substance like plants soil wood wall floor irrigation areas etc.

Based on this input at d2 arduino gives an active. 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. Don t change the supply voltage or the 220k as these two values are correct for this circuit.