E&TC / ECE · Healthcare electronics · Final year project
Smart Home Automation System with Light Dimmer
A Bluetooth home automation system with light dimming. An ATmega328P receives commands from an Android app to switch appliances and dim lights, including switching all lights at once.
What is the Smart Home Automation System with Light Dimmer project?
A Bluetooth home automation system with light dimming. An ATmega328P receives commands from an Android app to switch appliances and dim lights, including switching all lights at once.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Mechatronics
- Type
- Final year project · Beginner to intermediate
- Suitable for
- Diploma capstone and B.E / B.Tech final year
- Build time
- 3 to 4 weeks
- Estimated component cost
- ₹2,100 – ₹3,100
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Smart Home Automation System with Light Dimmer works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The ATmega328P microcontroller with base board is the brain of the circuit: it samples the sensors, compares readings with set limits and switches the outputs.
- The Bluetooth module links the circuit to a smartphone app so the user can send commands or receive readings.
- The LEDs indicate status.
Block diagram
Controller
ATmega328P microcontroller with base boardCommunication
Bluetooth moduleOutputs
LEDsComponents list and cost
Typical prices from Indian online stores and electronics markets (Lamington Road, Budhwar Peth, SP Road). Buy from one store where you can to save on shipping.
| Component | Qty | What it does | Approx. cost |
|---|---|---|---|
| ATmega328P microcontroller with base board | 1 | Is the brain of the circuit: it samples the sensors, compares readings with set limits and switches the outputs. | ₹350 |
| Bluetooth module (HC-05) | 1 | Links the circuit to a smartphone app so the user can send commands or receive readings. | ₹280 |
| LEDs (assorted) | 1 | Indicate status. | ₹20 |
| 12 V power adapter / step-down transformer | 1 | Supplies stable low-voltage power from the mains. | ₹250 |
| Passive components, PCB and wiring kit | 1 | Resistors (assorted), capacitors (assorted), PCB / breadboard and cables, connectors and jumper wires. | ₹310 |
| Wiring, PCB, soldering and enclosure | 1 | Project overhead | ₹450 |
| Demo model base / mounting board | 1 | Project overhead | ₹500 |
| Testing spares and replacements | 1 | Project overhead | ₹300 |
| Estimated total | Varies with brand, quality and city | ₹2,100 – ₹3,100 |
Prices are estimates for budgeting. We confirm the bill of materials when your design is frozen, and components are charged at actual cost with bills.
How much does this project cost?
| Option | What you get | Cost |
|---|---|---|
| Components only | You buy the parts and build it yourself | ₹2,100 – ₹3,100 |
| Hardware / IoT Final Year | Working model or guided build, Circuit diagram and bill of materials, Firmware / code with explanation | from ₹9,999 + components |
| Capstone Project (CPE) | Working project or model, Black book in MSBTE format, Step-by-step explanation | ₹9,999 + components |
| Diploma ITR | 100% working source code, Project report PDF, PPT | ₹1,999 + components |
No GST and no hidden charges. Use the cost calculator for a quote with your deadline and add-ons, or see all plans.
Download the project brief (PDF)
Summary, working, components and cost and viva questions on one branded PDF to show your guide or team. To get it developed, contact us on WhatsApp.
What you submit with this project
- Working model with circuit diagram and program code
- Project report or black book in your university's chapter order (block diagram, circuit, calculations, results)
- Presentation for the review and final viva
- Synopsis for topic approval, if your college asks for one
E&TC / ECE viva questions on this project
What is the aim of the Smart Home Automation System with Light Dimmer project?
A Bluetooth home automation system with light dimming. An ATmega328P receives commands from an Android app to switch appliances and dim lights, including switching all lights at once.
Explain the working of your project in short.
12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V. The ATmega328P microcontroller with base board is the brain of the circuit: it samples the sensors, compares readings with set limits and switches the outputs. The Bluetooth module links the circuit to a smartphone app so the user can send commands or receive readings. The LEDs indicate status.
Why is a microcontroller used in this project?
A microcontroller combines a CPU, memory and I/O pins on one chip, so a single low-cost IC can read sensors, make decisions in code and control loads without a computer.
How does the HC-05 Bluetooth module communicate with the microcontroller?
It uses UART serial at 9600 baud by default. Data typed in the phone app is received by the module and passed to the controller's RX pin as serial characters.
Why is a resistor connected in series with an LED?
It limits the current to a safe value (about 10–20 mA). Without it, the LED would draw too much current and burn out. R = (supply voltage − LED voltage) ÷ current.
How is 230 V AC converted to 5 V DC for the circuit?
A transformer steps down the voltage, a bridge rectifier converts AC to pulsating DC, a capacitor smooths it and a 7805 regulator gives a steady 5 V.
Explain the block diagram of your project.
The input section senses the real-world quantity, the ATmega328P microcontroller with base board processes it according to the program, and the output section acts locally and sends the data or alert wirelessly. The power supply section feeds every block.
Which communication protocols are used between the modules?
UART (serial) for the GSM, GPS, Bluetooth or fingerprint modules. Each protocol was chosen because the module supports it and it uses the fewest pins.
What is the operating voltage of the circuit?
The controller and most sensors work at 5 V (ESP boards and some modules at 3.3 V). A 12 V adapter powers the board, and a regulator steps it down. Motors and relays get their own supply line so they do not reset the controller.
Is your system open-loop or closed-loop?
Mainly open-loop: the controller runs the actuators for a set time or number of steps. Adding a sensor for feedback would make it closed-loop and more accurate.
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Want to build Smart Home Automation System with Light Dimmer?
Send your college, deadline and team size. We confirm the scope, cost and what you will submit.