• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright | Videos | Circuits for Beginners | Basic Circuits | Hobby Projects | Transistor Circuits | LED Drivers 

You are here: Home / Arduino Engineering Projects / Automatic Irrigation Circuit using Arduino

Automatic Irrigation Circuit using Arduino

Last Updated on March 20, 2019 by Swagatam

caution electricity can be dangerous

In this post we are going to construct an automated water irrigation system for small garden using arduino and soil moisture sensor.

Introduction

The proposed system can monitor the soil moisture level and when soil moisture goes below preset value, the 12V DC pump will be triggered for predetermined period of time. The status of the soil moisture level and other functions of the system can be monitored via 16 x 2 LCD display in real time.

It is estimated that there are 3 trillion trees across the globe which is greater than the number of start in our home Milky Way galaxy which is estimated to be 100 billion. But, we humans cut countless number of trees to fulfil our basic needs to luxury needs.

Mother Nature is designed with a feedback system, when a species introduces huge disturbances, nature will wipe the species out of existence.

Human beings were disturbing the nature unknowingly for centuries but, even after great development in science and technology the rate of disturbance haven’t reduced.

Climate change is one of the examples, when it gets drastic enough our species won’t last long.
This project take a baby step forward to preserve the nature, it can irrigate your lovely small garden without any human interaction. Now let’s get in to technical details of the project.

Soil Moisture Sensor:

The heart of the project is soil moisture sensor which can sense the amount of moisture content in soil. The sensor gives out analog value and a microcontroller will interpret those values and display the moisture content.

There are two electrodes, which will be inserted in the soil. The electrodes are connected to a circuit board consisting of comparator IC, LED, trimmer resistor input and output pins.

Illustration of soil moisture sensor:

soil moisture sensor module

It has 4 + 2 pins, 2 pins for electrode connection and rest of the 4 pins are Vcc, GND, digital output and analog output. We are going to use only the analog output pin for sensing soil moisture.
Since we are not using digital output pin, we will not be using on-board trimmer resistor to calibrate the sensor.

Now, that concludes the soil moisture sensor.

Schematic diagram:

The circuit is kept fairly simple and beginner friendly. The schematic is divided into two parts of the same project to reduce confusion while duplicating the project.

LCD wiring diagram for Automatic Irrigation System

The above schematic is the LCD to arduino wiring. A 10K potentiometer is provided to adjust the contrast of the LCD display.

Microcontroller based Automatic Irrigation System

Here is the rest of the schematic consisting of soil moisture sensor, 12V DC pump, a calibrate push button and 12V (1 - 2 amp) power supply. Please use a power supply at least greater than 500mA of 12V DC pump’s current rating.

The MOSFET IRF540N (or any equivalent N-channel) is used instead of BJTs to improve the overall power efficiency of the system.

The pump will water you small garden, make sure you always have adequate amount of water is available.

Program Code:

//-------------Program Developed By R.Girish-------------//
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int Time = 5;         // Set time in minutes
int threshold = 30;   // set threshold in percentage 80, 70, 60, 50, 40, 30, 20 only.
int i;
int x;
int y;
int z;
int start;
int calibrateValue;
const int calibrateBTN = A1 ;
const int input = A0;
const int motor = 7;
boolean calibration = false;
boolean rescue = false;
void setup()
{
Serial.begin(9600);
pinMode(input, INPUT);
pinMode(calibrateBTN, INPUT);
pinMode(motor, OUTPUT);
digitalWrite(calibrateBTN, HIGH);
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("Pour water and");
lcd.setCursor(0,1);
lcd.print("press calibrate");
while(!calibration)
{
if(digitalRead(calibrateBTN)==LOW)
{
calibrateValue = analogRead(input);
x = 1023 - calibrateValue;
x = x/10;
Serial.print("Difference = ");
Serial.println(x);
Serial.print("Calibration Value = ");
Serial.println(calibrateValue);
delay(500);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Calibration done");
lcd.setCursor(0,1);
lcd.print("successfully !!!");
calibration = true;
delay(2000);
}
}
}
void loop()
{
if(analogRead(input)<= calibrateValue)
{
delay(500);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 100%");
}
if(analogRead(input) > calibrateValue && analogRead(input) <= calibrateValue+x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 90 to 99%");
}
if(analogRead(input) > calibrateValue+x && analogRead(input) <= calibrateValue+2*x )
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 80 to 90%");
start = 80;
}
if(analogRead(input) > calibrateValue+2*x && analogRead(input) <= calibrateValue+3*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 70 to 80%");
start = 70;
}
if(analogRead(input) > calibrateValue+3*x && analogRead(input) <= calibrateValue+4*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 60 to 70%");
start = 60;
}
if(analogRead(input) > calibrateValue+4*x && analogRead(input) <= calibrateValue+5*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 50 to 60%");
start = 50;
}
if(analogRead(input) > calibrateValue+5*x && analogRead(input) <= calibrateValue+6*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 40 to 50%");
start = 40;
}
if(analogRead(input) > calibrateValue+6*x && analogRead(input) <= calibrateValue+7*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 30 to 40%");
start = 30;
}
if(analogRead(input) > calibrateValue+7*x && analogRead(input) <= calibrateValue+8*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 20 to 30%");
start = 20;
}
if(analogRead(input) > calibrateValue+8*x && analogRead(input) <= calibrateValue+9*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: 10 to 20%");
start = 10;
}
if(analogRead(input) > calibrateValue+9*x && analogRead(input) <= calibrateValue+10*x)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Soil Moisture");
lcd.setCursor(0,1);
lcd.print("Level: < 10%");
rescue = true;
}
if(start == threshold || rescue)
{
y = Time;
digitalWrite(motor, HIGH);
Time = Time*60;
z = Time;
for(i=0; i<Time; i++)
{
z = z - 1;
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("PUMP IS ON, WILL");
lcd.setCursor(0,1);
lcd.print("TURN OFF IN:");
lcd.print(z);
}
Time = y;
rescue = false;
digitalWrite(motor, LOW);
}
delay(1000);
}
//-------------Program Developed By R.Girish-------------//

How to calibrate this automatic irrigation system:

•    With completed hardware, insert the electrode on soil, somewhere at the path of water flow.
•    Now change the two values in the program 1) The amount of time will take to water all the plants (in minutes). 2) Threshold level below which the arduino triggers the pump. You can set the percentage values 80, 70, 60, 50, 40, 30, 20 only.

int Time = 5;         // Set time in minutes
int threshold = 30;   // set threshold in percentage 80, 70, 60, 50, 40, 30, 20 only.

Change the values in the program.

•    Upload the code to arduino and power the circuit. It will display “pour water and press calibrate”. Now you have to manually water your garden to sufficient level.
•    After watering the garden, press the calibrate button. This will determine the conduction of electricity in fully moisture soil and snap shot the reference value.
•    Now the system is ready to serve your small garden. Please try to add a power backup for this project. When the power fails the reference calibrated value will be wiped out of memory and you will have to calibrate the system again.

Author’s prototype:

Arduino based Automatic Irrigation Prototype Image

Indication of soil moisture level:

Once the pump is turned ON, it will display remaining time to turn off (in seconds).

You'll also like:

  • 1.  Wireless Office Call Bell Circuit
  • 2.  PIC Tutorial- From Registers to Interrupts
  • 3.  Microcontroller Basics Explored
  • 4.  Buck Converter Circuit Using Arduino
  • 5.  Password Security Lock Circuit Using 4×4 Keypad and Arduino
  • 6.  Digital Clock Circuit Using 16×2 LCD Display

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Have Questions? Please Comment below to Solve your Queries! Comments must be Related to the above Topic!!

5 Comments
Newest
Oldest
Inline Feedbacks
View all comments

Primary Sidebar

Calculators

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (98)
  • 741 IC Circuits (19)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (114)
  • Battery Chargers (82)
  • Car and Motorcycle (94)
  • Datasheets (46)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (100)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (116)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (13)
  • GSM Projects (9)
  • Health Related (20)
  • Heater Controllers (29)
  • Home Electrical Circuits (102)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LED and Light Effect (93)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (65)
  • Mini Projects (148)
  • Motor Controller (67)
  • MPPT (7)
  • Oscillator Circuits (26)
  • PIR (Passive Infrared) (8)
  • Power Electronics (34)
  • Power Supply Circuits (77)
  • Radio Circuits (10)
  • Remote Control (48)
  • Security and Alarm (61)
  • Sensors and Detectors (120)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (60)
  • Timer and Delay Relay (53)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (40)
  • Ultrasonic Projects (16)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations

wpDiscuz