Automatic Plant Watering System Using Arduino Uno

Automatic Plant Watering System Using Arduino Uno 

By Suman Majhi

Coding Solution

Introduction

In this system, soil moisture sensor senses the moisture level of the soil. If soil will get dry then sensor senses low moisture level and automatically switches on the water pump to supply water to the plant. As plant get sufficient water and soil get wet then sensor senses enough moisture in soil. After which the water pump will automatically get stopped.

Automatic plant watering system coding

int WATERPUMP = 13; //motor pump connected to pin 13
int sensor = 8; //sensor digital pin vonnected to pin 8
int val; //This variable stores the value received from Soil moisture sensor.

void setup() {
  
  pinMode(13,OUTPUT); //Set pin 13 as OUTPUT pin
  pinMode(8,INPUT); //Set pin 8 as input pin, to receive data from Soil moisture sensor.
  //Initialize serial and wait for port to open:
  Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
  while (! Serial);// wait for serial port to connect. Needed for native USB
  Serial.println("Speed 0 to 255");
}

void loop()
  { 
  if (Serial.available()) //loop to operate motor
  {
    int speed = Serial.parseInt(); // to read the number entered as text in the Serial Monitor 
    if (speed >= 0 && speed <= 255)
    {
      analogWrite(WATERPUMP, speed);// tuns on the motor at specified speed 
    }
  }
  val = digitalRead(8);  //Read data from soil moisture sensor  
  if(val == LOW) 
  {
  digitalWrite(13,LOW); //if soil moisture sensor provides LOW value send LOW value to motor pump and motor pump goes off
  }
  else
  {
  digitalWrite(13,HIGH); //if soil moisture sensor provides HIGH value send HIGH value to motor pump and motor pump get on
  }
  delay(400); //Wait for few second and then continue the loop.
}

SCHEMATICS

Main Components

Arduino Uno
D.c Motor for using water pump
Motor driver
Soil moisture sensor