Moisture Sensor Circuit Using Arduino

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.

Moisture sensor circuit using arduino.

The sensor has 4 terminals for connection vcc for power gnd analog output and digital output. Here we connect 3 3v 5v of external power. It has a detection length of 38mm and a working voltage of 2v 5v. If you type in arduino soil moisture sensor into ebay you will see the complete type of sensor needed to build this circuit.

In this tutorial we have used the waveshare soil moisture sensor. Interfacing soil moisture sensor and arduino. This can be measured using a soil moisture sensor either resistive or capacitive here we will use capacitive soil moisture sensor v1 2 this sensor measures the volumetric content of water inside the soil and. 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 project is about arduino and capacitive soil moisture sensor lcd oled interfacing tutorial. In order to test the device set up the arduino sensor and different soil samples. Analog mode interfacing soil moisture sensor and arduino. The sensor gives analog values from 0 1023 and moisture are measured in percentage so we will map these values from 0 100 by using map function in code.

It has a fork like design which makes it easy to insert into the soil. This has two header pins which connect to an amplifier a d circuit which is in turn connected to the arduino. In no moisture soil the program should output a value of. To connect the sensor in the analog mode we will need to use the analog output of the sensor.

Soil moisture is basically the amount content of water present in the soil. Int limit 300. Vcc and ground are how the sensor gets the power it needs to operate. The soil moisture is monitored in real time.

The third defines a limit in this case if the sensorvalue is larger than the limit then a led will light up. Once everything is connected and in sync with the program on the computer place the sensor into a sample of soil. Now that the sensor can measure soil moisture from the coding input we have to test it. When taking the analog output from the soil moisture sensor fc 28 the sensor gives us the value from 0 1023.

The first one defines the analog pin of the arduino. The second defines the analog value of the sensor read by the arduino. Analog mode interfacing soil moisture sensor with arduino using analog pin in this mode we are using the analog pin of the sensor to get output. A 12volt dc water pump is controlled as the soil moisture increases or decreases below a certain pre defined value.

The hardware is consists of an arduino microcontroller here an arduino uno r3 and a pre wired soil moisture sensor module. A typical soil moisture sensor consist of two components.