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.

This digital output wet soil l dry soil h is routed to one i o terminal d2 of the arduino microcontroller. 1 to proceed with its. In the previous circuits of moisture sensors like plant soil moisture tester circuit or moisture sensor alarm. 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 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. The sensor module contains a potentiometer with it which is used to set the threshold value. I have given below soil moisture sensor circuit diagram. 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. This is very simple and interesting circuit for electronics lovers. This soil moisture sensor circuit can be used in many applications like automatic plant irrigation system greenhouse projects etc. A 12volt dc water pump is controlled as the soil moisture increases or decreases below a certain pre defined value.

The soil moisture is monitored in real time. Under the circuit diagram section we have our schematic made with fritzing also underneath that we have the practical test setup. The circuit diagram for this is very simple. Don t change the supply voltage or the 220k as these two values are correct for this circuit.

We have interfaced the moisture sensor with arduino uno board. The circuit can be used to detect moisture in any substance like plants soil wood wall floor irrigation areas etc. In this circuit we have used an npn transistor to detect soil moisture. Working of the sensor head electronics is self explanatory so just follow the conceptual drawing and schematic drawing shown in fig.

Connect the vcc pin to 3 3v of arduino and gnd to gnd. Digital mode interfacing arduino and soil moisture sensor. When soil is moist the current will start flowing from one terminal to another working as a closed circuit. 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.

Based on this input at d2 arduino gives an active. 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. In this project we are going to build a transistor based simple soil moisture detector circuit.