Automatic Plant Watering System Using Arduino

Kumaresh Rajalingam
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Introduction

In this article I'll show you how to create an automatic plant watering system using Arduino Mega interfacing to Android mobile. This project is fully based upon soil moisture irrigation.

Requirements

Arduino Mega
Soil Moisture Sensor
Motor
HC-05 Bluetooth Module
Bread Board
GSM900 Module
Led
Some Wires

Connections

GSM

RX to RX1
TX to TX 1
Gnd to Gnd

Bluetooth

RX to TX
TX to RX
Vcc to Arduino 5v
Gnd to Gnd

Led

Anode to the digital pin 5
Cathode pin to the Gnd

Soil Moisture

Vcc pin to the 5v
Gnd to Gnd
Data pin to the Analog A0

Programming

#include<SoftwareSerial.h>
SoftwareSerial firstSerial(15,16);
int led = 5;
int pin=A0;
int moisture=0;
String readString;
void setup()
{
Serial.begin(9600);
firstSerial.begin(9600);
Serial.begin(9600);
pinMode(led, OUTPUT);
delay(100); // Baud Rate
}
void loop()
{
while (Serial.available()) //Send data only when you receive data
{
delay(4); //delay time
char c = Serial.read();
readString += c;
}
if (readString.length() > 0)
{
Serial.println(readString);
if (readString == "ON")
{
digitalWrite(led, HIGH); // LED ON
}
if (readString == "OFF")
{
digitalWrite(led, LOW); //LED OFF
}
readString = "";
}
int soilmoisture=analogRead(pin);
if(soilmoisture>=100){
digitalWrite(led,HIGH);
firstSerial.println("AT+CMGF=1");
delay(1000);
firstSerial.println("AT+CMGS=\"+xxxxxxxxxx\"\r"); //Enter Your Mobile Number instead XXXX while Testing
delay(1000);
firstSerial.println("Hai there I need some water");
delay(100);
firstSerial.println((char)23);
delay(1000);
}
else{
digitalWrite(led,LOW);
}
Serial.println(soilmoisture);
Serial.print("%");
delay(20);
}

Android App

The Android App is developed using MIT App inventor.
The Android coding is attached in the zip you can download and install it to your mobile and you can modify it with your own method.

Explanation

The Automatic plant watering system is based upon soil irrigation. In the program first we want to set the header file to the GSM Module and set the RX and TX Pin to the GSM Module. In the setup function we want to set the baud rate for GSM and the Arduino Board as 9600 and here we are using the HC-05 Bluetooth device for pairing between Android mobile and the Arduino when it is paired, which means completely controlled through the Android device. Here's the procedure:

Working Procedure

Step 1: Connect the device using BT Communication method and pair it to Android Mobile.

Step 2: It shows the status every 60 seconds.

Step 3: When the temperature is greater than 100 the water will pump through the plant. This is based on soil irrigation.

Output