Automatic Plant Watering System using Arduino & Soil Moisture Sensor | LCD display [with CODE]

Summary

This Arduino tutorial video builds on a previous lesson about soil moisture sensors by integrating an LCD module and a water pump to create an automatic plant watering system. The required components include an Arduino board, soil moisture sensor, LCD module, relay module, a 9-volt water pump, and jumper wires. The script outlines the connections for each part and provides a code example that activates the pump when soil is dry, displaying status on the LCD. The demonstration shows the system in action, automatically watering the plant when needed.

Takeaways

• 😀 The video is an Arduino tutorial focused on creating an automatic plant watering system.
• 🔧 The main components needed are an Arduino board, a soil moisture sensor, an LCD module, a relay module, a water pump, and jumper wires.
• 📐 The LCD module used is a 16x2 I2C model, which simplifies the wiring process.
• 🔌 Connections involve linking the VCC and ground of all components to the Arduino's 5V and ground, with specific pins for the sensor, LCD, and relay.
• 💧 The soil moisture sensor's analog output is connected to Arduino's analog pin A0.
• 🖥 The LCD module's SDA and SCL pins are connected to Arduino's analog A4 and A5 pins, respectively.
• 🔘 The relay module's signal input is connected to a digital pin on the Arduino, in this case, digital pin 7.
• 🌡 The water pump's operation is controlled by the relay module, which is activated when the soil is dry based on sensor readings.
• 📊 The code includes logic to determine soil moisture levels and activate the pump accordingly.
• 💬 The LCD displays the soil moisture status and the motor's (pump's) status.
• 🔧 A demonstration is provided showing the system in action, with the pump turning on when the soil is dry and off when it's wet.

Q & A

What is the main focus of the video tutorial?

The main focus of the video tutorial is to demonstrate how to add an LCD module and a water pump to an existing soil moisture sensor setup to create an automatic plant watering system using an Arduino board.

What is the purpose of using an LCD module in this project?

The purpose of using an LCD module is to display the moisture content of the soil, providing a visual representation of the sensor readings.

What type of water pump is used in the tutorial?

A small 9-volt water pump is used in the tutorial for the automatic plant watering system.

What is the role of the relay module in this setup?

The relay module is used to control the water pump's operation based on the soil moisture levels read by the sensor.

Which pins on the Arduino board are used for the LCD module connections?

The LCD module's VCC and ground are connected to the Arduino's 5V and ground. The SDA pin is connected to the Arduino's analog A4 pin, and the SCL pin is connected to the Arduino's analog A5 pin.

How is the soil moisture sensor connected to the Arduino board?

The soil moisture sensor's VCC and ground are connected to the Arduino's 5V and ground, and the analog output pin is connected to the Arduino's analog pin A0.

What is the significance of the value 950 in the code?

The value 950 is used as a threshold in the code to determine when the soil is dry and needs watering, triggering the relay to activate the water pump.

How does the code differentiate between dry, medium, and wet soil conditions?

The code uses if-else statements to evaluate the sensor values. If the value is greater than 950, the soil is considered dry. If the value is between a certain range (not specified in the transcript), the soil is medium. If less than 400, it is considered wet.

What function is used to control the relay pin in the code?

The `digitalWrite` function is used to control the relay pin, which is connected to digital pin 7, to turn the water pump on or off based on the soil moisture levels.

How is the status of the soil and the motor displayed on the LCD?

The status of the soil (dry, medium, wet) and the motor status (on or off) are displayed on the LCD using the LCD module's commands, with the soil status on the first row and the motor status on the second row.

What is the purpose of the demonstration at the end of the tutorial?

The purpose of the demonstration is to show the automatic plant watering system in action, illustrating how the system monitors soil moisture and triggers the water pump when the soil is dry.

Outlines

00:00

💧 Building an Automatic Plant Watering System with Arduino

This paragraph introduces an Arduino tutorial focused on creating an automatic plant watering system. The tutorial builds upon a previous video that explained the basic operation of a soil moisture sensor and included basic code for reading moisture values. The project incorporates an LCD module for displaying moisture content and a water pump for automatic watering. The required components include an Arduino board, soil moisture sensor, 16x2 LCD module with an I2C interface, a single-channel relay module, a 9-volt water pump, a power supply, and jumper wires. The paragraph details the connections for each component, starting with the moisture sensor to the Arduino's 5V and GND, and the analog output to pin A0. The LCD module is connected to the same power and ground, with the SDA and SCL pins connected to A4 and A5, respectively. The relay module is also connected to 5V and GND, with its signal input connected to a digital pin (in this case, pin 7). The water pump's negative terminal is connected to the battery's negative terminal, and the positive terminals are connected to the relay module's common and normally open terminals. The paragraph concludes with a reference to a separate tutorial on relay basics and a link to the circuit diagram in the description box.

05:00

🔧 Implementing the Watering System Logic and LCD Display

In this paragraph, the script outlines the coding process for the automatic plant watering system. It begins with a review of the existing code from a previous tutorial, which reads sensor values and evaluates them using if-else statements to determine soil moisture levels. The code is then expanded to include logic for activating a pump when the soil is dry, indicated by a sensor value greater than 950. The script explains the use of a digital pin (pin 7) to control the relay, which in turn controls the water pump. The code also includes logic to handle different soil moisture conditions, ensuring the pump is off when the soil is medium or wet. Additionally, the paragraph describes the integration of an LCD module to display information about the soil's moisture status and the pump's operation. It references previous tutorials for understanding the basics of LCD coding and mentions the use of a 16x2 LCD. The script provides a brief overview of the LCD's setup, including initialization functions and displaying messages on the LCD based on the soil moisture condition. The paragraph concludes with a demonstration of the system in action, showing how the motor starts when the soil is dry and stops once the soil is wet, after adding water to the soil.

Keywords

💡Arduino

Arduino is an open-source electronics platform based on easy-to-use hardware and software. It is widely used for building various interactive electronic projects. In the video's context, it serves as the central control unit for the automatic plant watering system, handling the reading of moisture values and activating the water pump when necessary.

💡Soil Moisture Sensor

A soil moisture sensor is a device that measures the amount of water present in the soil. It is crucial in the video's project as it provides the data needed to determine the soil's moisture content. The sensor's output is read by the Arduino board to decide whether to activate the water pump.

💡LCD Module

An LCD (Liquid Crystal Display) module is an electronic display module used to display information in a readable format. In the video, it is used to show the moisture content and the status of the water pump, providing a visual interface for the automatic watering system.

💡i2c Interface

The i2c (inter-integrated circuit) interface is a two-wire serial communication protocol used to connect and control devices. In the script, the i2c module is used for the LCD to simplify the wiring and connection to the Arduino board.

💡Relay Module

A relay module is an electrical switch that can be controlled by a low-power signal, used to control high-power devices like the water pump in the video. The Arduino sends a signal to the relay module to turn the water pump on or off based on the soil's moisture level.

💡Water Pump

A water pump is a device that moves fluids, typically water, often used in irrigation systems. In the video, a small water pump is integrated into the system to automatically water the plants when the soil moisture level is too low.

💡Jumper Wires

Jumper wires are used to create connections between electronic components without soldering. In the context of the video, jumper wires are essential for connecting the various components of the automatic watering system to the Arduino board.

💡Analog Pin

An analog pin on an Arduino board can read continuous voltage levels, making it suitable for sensors that provide an analog output. In the video, the analog pin A0 is used to connect the soil moisture sensor, while A4 and A5 are used for the LCD module's SDA and SCL connections.

💡Digital Pin

A digital pin on an Arduino board can be set to either a high or low state, used for digital signals. In the video, digital pin 7 is connected to the relay module to control the water pump, illustrating the use of digital pins for controlling devices.

💡Circuit

A circuit refers to the path of electrical flow from a power source through various components and back to the source. The video describes the connections between the Arduino, soil moisture sensor, LCD module, relay module, and water pump to form a functional circuit for the automatic watering system.

💡Code

Code in the context of the video refers to the programming script written for the Arduino board to control the automatic watering system. It includes logic to interpret sensor data and commands to activate or deactivate the water pump and update the LCD display.

Highlights

Introduction to the tutorial on adding an LCD module and a water pump to an Arduino project for an automatic plant watering system.

Explanation of the components needed including an Arduino board, soil moisture sensor, LCD module, relay module, water pump, and jumper wires.

Emphasis on using an I2C module for easier LCD connection.

Description of the connections starting with the Arduino 5V and ground for all components.

Connection details for the soil moisture sensor to the Arduino analog pin A0.

Instructions for connecting the LCD module to the Arduino, including the SDA and SCL pins.

Relay module connection to the Arduino and the significance of the signal input pin.

Water pump connection details, including the connection to the relay module.

Brief mention of a separate tutorial on the basics of relays.

Code review from a previous tutorial and the addition of logic for the water pump activation.

Explanation of the if-else statements used to evaluate soil moisture levels and activate the pump when dry.

Declaration of the relay pin and setting it as an output for pump control.

Demonstration of the pump activation when soil moisture is below a certain threshold.

Logic for keeping the pump off when soil is medium or wet.

Introduction of LCD logic to display soil and motor status.

Details on LCD initialization and status display for different soil conditions.

Demonstration of the system in action, showing the LCD updates and motor activation.

Final remarks on the system's ability to monitor moisture and trigger the motor automatically.

Invitation for viewers to ask questions in the comments and a prompt to visit the provided links for code and circuit details.

Transcripts

[Music]

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[Music]

part of the Arduino tutorials

in my previous video

I have already explained the basic

working of the soil moisture sensor and

also we have done some basic code to

read the moisture values from the soil

so in continuation to that video

we'll be additionally adding an LCD

module to display the moisture content

and also

a small water pump to make an automatic

plant watering system

[Music]

the components needed for this tutorial

are Arduino board

soil moisture sensor

LCD module

I am using this 16 Cross 2 module

along with this iTunes interface so if

you're planning to buy make sure

you have this i2c module

which makes your connection easier

next we need a single Channel relay

module

a small water pump

here I'll be using this nine volt one

a power supply corresponding to your

water pump

and finally some jumper wires

moving on to the connections

I'll be taking the Arduino 5 volt and

ground

on the breadboard

since we need it for all the components

starting with the moisture sensor

the VCC and ground

goes to Arduino 5 volt and ground

and the analog output pin a0

is connected to Arduino

analog pin a0

on the LCD module

the VCC and ground

again goes to

Arduino 5010 ground

the SDA pin

is connected to Arduino analog A4 pin

and scl

connected to Arduino analog pin A5

moving to the relay module

again the VCC ground

is connected to Arduino 5 volt and

ground

and the signal input pin

can be connected to any digital pin

here I am using the digital pin 7.

and moving to the last component the

water pump

so the negative terminal

of the pump is connected to negative

terminal of the battery

the left out positive terminals

of both

will be connected to the relay module

so one goes to the common terminal

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should be connected to normally open

Terminal

so if you want to understand the basics

of relay I have already made a separate

tutorial you can check out

that's it the connections if you face

any difficulties follow the circuit link

provided in the description box

moving to the code

here I have already opened the code from

my previous tutorial

here we have just read the sensor pin

and using simple if else statements we

have evaluated the values

coming from the sensor

so if it's greater than this value then

there'll be no moisture and soil will be

dry

and if the values from the sensor is

between this range then the soil is the

medium condition and for less than 400

it is wet

so this condition checks remains same

additionally we'll try adding the logic

to activate the pump

so in this three cases we have to just

run the pump when soil is dry so I have

to add

the relay activation here in this first

if statement

before that we'll declare the pin we

have connected the relay using in data

type

relay pin is connected to digital pin 7

and also in the setup

will set the pin mode

as output

so we have to use the digital write

function

when my sensor data is greater than 950

it indicate soil is dry so I am

activating the relay which

indirectly

starts the motor or the pump relay pin

will make it high

and coming to other conditions so here

soil is medium

so we have to

keep our pump Switched Off

same digital right

but pump will be off

also in the last statement it says soil

is wet again we have to switch off the

pump

so same logic goes here as well

that's all the logic for the pump

will also add some logic to print some

information on the LCD

so here I'll not go in depth for the LCD

commands

you can refer to my previous tutorials

to understand basics of LCD coding

just

including the header file

and creating some object for this class

also in the setup we have to call some

initialization functions

so all these Basics I have already

explained in my previous tutorials

I'm using 16 Cross to LCD

so when it comes to this if statement

I'll just show

the status as soil is dry in the first

row of the LCD

in the second row of the LCD

I'll give you information on the motor

status here

my motor will be on

so I'll give motor on

so I'll copy the same

lines for other statements

here

the soil status will be medium

and motor will be off

and the last statement

soil is wet

and the motor will be off

so that's all the logic

for LCD

I'll upload this and see how this works

initially I have kept the battery

disconnected

for the water pump

and I'll insert the sensor module into

the pot

in which the soil is already dry

since the soil is dry on the LCD showing

soil dry and also the motor on

as soon as I connect the battery

the motor started running

[Music]

so just for demonstration I'll add some

water

as soon as there is inner water

the status

shows soil is wet and also motor is off

in this way the system monitors the

moisture and whenever needed it triggers

the motor automatically

so that's all for this video

if you have any doubts let me know in

the comment section below

for code and circuit visit the link in

the description box

thank you for watching and we'll be back

in another interesting tutorial

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