Open Source Home Automation Project using Arduino UNO + Ethernet Shield

How Does it Work

The main brain for this project is Arduino UNO Board along with Arduino Ethernet Shield to give it a wireless connectivity.Arduino runs a code to control a Relay board according to the input and also serves a web page through which respective output to the relay board can be controlled.Through relay controller board we can control lamps, tubes or any AC power sockets.
You will be able to control all of your AC Appliances wirelessly with the help of any WIFI Enabled device.
Open Source Home Automation Project using Arduino UNO + Ethernet Shield


Relay Controller Board Build Tutorial:

Quantity of the components depends upon how many channels you want e.g. if you want to control more than one light then you will have to add that much number of relays on your controller board.
Here is the material list which will be needed to build the board: (Quantity of the components given for making 1 channel relay controller)
Sr.No Component Names Quantity
1 Relay (I have used GOODSKY RWH-SH-105D Relay) 1
2 Transistor 2N3904 1
3 1K Resistor 2
4 10K Resistor 1
5 1N4148 Diode 1
6 Red Led 3mm 1
7 3 Pin PCB Mount Connector 1
8 1 Pin PCB Mount Connector 1
Above components are for making of single controller board you can multiply number of the components depending on how many relay controller you want.
Here in the circuit diagram Pin no.2 will be connected to the arduino control output pin and other two will be connected to +5V and Gnd accordingly.
After soldering all of your components according to the above circuit diagram the board should look like this.


All the usual warnings apply: Mains voltage (120VAC or 220VAC) can kill you. This project, if done incorrectly, could certainly burn down your house. Do not work on or solder to any part of a project while it is plugged into the wall socket – just unplug it before modifying anything!


Getting IP Address Of Arduino Ethernet Shield:

 Mount your Arduino Ethernet shield on Arduino Uno as shown:
Now connect your Uno Board to PC with USB cable and open Arduino IDE. After Opening up you will find blank Arduino window. Now go to File–> Example –> Ethernet –> dhcp address printer sketch. Your Ethernet shields MAC address is printed on back of it as follow you will need this in DHCP ADDRESS PRINTER code to get the IP address of your Ethernet shield.
In DHCP address printer sketch put your MAC address as given on back of the Ethernet shield and upload it to the Arduino board.
After finished uploading connect Arduino Ethernet shield to internet with Ethernet cable once connected then open up you serial monitor of Arduino IDE the IP address allotted to your Ethernet shield will be displayed e.g. ( note it down somewhere because you are going to need this in further codes.


BuildingMainCircuitConnection :
Now we are ready with our Relay controller board. So, it’s time to move on to the Main Circuit Connections. Here I have given the pin configuration for the whole Autohome Project.
Open Source Home Automation Project using Arduino UNO + Ethernet Shield Schematic
Arduino Digital Pin No. Pin Usage
4 will be used for Infrared Receiver
5 used as Output Pins to control Relays
6 used as Output Pins to control Relays
7 used as Output Pins to control Relays
8 used as Output Pins to control Relays
9 used as Output Pins to control Relays
10 will be used by Arduino Ethernet Shield
11 will be used by Arduino Ethernet Shield
12 will be used by Arduino Ethernet Shield
13 will be used by Arduino Ethernet Shield
Note: For relays it is recommended to power it from separate source not from Arduino (I have powered it from Arduino only but since here we are working with single board. As board number increases Arduino won’t be able to supply sufficient power to the boards.)

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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