E&TC / ECE · GSM and GPS · Final year project
GSM Home Automation
SMS-controlled home automation that also reads sensors. Depending on commands from the user's phone and current sensor conditions, the microcontroller switches lights, fans and other AC appliances.
What is the GSM Home Automation project?
SMS-controlled home automation that also reads sensors. Depending on commands from the user's phone and current sensor conditions, the microcontroller switches lights, fans and other AC appliances.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Mechatronics
- Domain
- GSM and GPS projects
- Type
- Final year project · Intermediate
- Suitable for
- Diploma capstone and B.E / B.Tech final year
- Build time
- 4 to 6 weeks
- Estimated component cost
- ₹2,800 – ₹4,100
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the GSM Home Automation works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Push buttons and switches provide manual inputs and the power switch.
- The STM32 board provides a fast 32-bit ARM processor for timing-critical control.
- The GSM module sends SMS alerts or makes calls to the registered phone number using a normal SIM card.
- The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The LEDs indicate status.
Block diagram
Inputs
Push buttons and switchesController
STM32 boardCommunication
GSM moduleOutputs
16×2 LCD with I2C adapterLEDsComponents 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 |
|---|---|---|---|
| STM32 (Blue Pill) board | 1 | Provides a fast 32-bit ARM processor for timing-critical control. | ₹450 |
| Push buttons and switches | 2 | Provide manual inputs and the power switch. | ₹80 |
| GSM module (SIM800L) | 1 | Sends SMS alerts or makes calls to the registered phone number using a normal SIM card. | ₹450 |
| 16×2 LCD with I2C adapter | 1 | Shows readings, status and messages to the user. | ₹220 |
| LEDs (assorted) | 1 | Indicate status. | ₹20 |
| 12 V power adapter / step-down transformer | 1 | Supplies stable low-voltage power from the mains. | ₹250 |
| Loads | 1 | Part from the design specification | ₹150* |
| Passive components, PCB and wiring kit | 1 | Crystal oscillator, resistors (assorted), capacitors (assorted), transistors / MOSFETs, cables, connectors and jumper wires, diodes, PCB / breadboard and ICs and IC sockets. | ₹445 |
| 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 | ₹2,800 – ₹4,100 |
Prices are estimates for budgeting; items marked * depend on the exact size or model chosen. 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 | ₹2,800 – ₹4,100 |
| 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 GSM Home Automation project?
SMS-controlled home automation that also reads sensors. Depending on commands from the user's phone and current sensor conditions, the microcontroller switches lights, fans and other AC appliances.
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 Push buttons and switches provide manual inputs and the power switch. The STM32 board provides a fast 32-bit ARM processor for timing-critical control. The GSM module sends SMS alerts or makes calls to the registered phone number using a normal SIM card.
What is the advantage of a 32-bit ARM controller?
It runs at 72 MHz with more memory and hardware peripherals, so control loops, filtering and communication run faster and more precisely than on an 8-bit controller.
Why is a pull-up resistor needed with a push button?
Without it the input pin floats and reads random values. The pull-up keeps it HIGH until the button connects it to ground.
How does the GSM module send an SMS?
The microcontroller sends AT commands over serial, for example AT+CMGF=1 to select text mode and AT+CMGS with the phone number followed by the message. The module transmits it over the mobile network.
Why is an I2C adapter used with the LCD?
It reduces the wiring from about 10 pins to 2 (SDA and SCL), leaving more controller pins free for sensors.
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.
Explain the block diagram of your project.
The input section senses the real-world quantity, the STM32 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 and I2C for the display, RTC or motion sensor (only SDA and SCL lines). 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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