E&TC / ECE · GSM and GPS · Final year project
Biometric Based Exam Gate Authentication System with SMS Alert
A fingerprint-controlled exam hall gate. Registered candidates scan their finger to unlock the door, and the admin receives an SMS for each entry; after three failed attempts by an unknown person an alert is sent.
What is the Biometric Based Exam Gate Authentication System with SMS Alert project?
A fingerprint-controlled exam hall gate. Registered candidates scan their finger to unlock the door, and the admin receives an SMS for each entry; after three failed attempts by an unknown person an alert is sent.
Key facts
- 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
- ₹3,800 – ₹5,500
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Biometric Based Exam Gate Authentication System with SMS Alert works
- 12 V power adapter / step-down transformer and Voltage regulator / buck converter supply the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Fingerprint sensor captures and matches fingerprints to authenticate the user.
- The Push buttons and switches provide manual inputs and the power switch.
- 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 Motor driver lets the low-current controller run the motors forward, reverse and at variable speed.
- The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The LEDs indicate status.
Block diagram
Inputs
Fingerprint sensorPush buttons and switchesController
ATmega328P microcontroller with base boardOutputs
Motor driver16×2 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 |
|---|---|---|---|
| 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 |
| Fingerprint sensor (R307) | 1 | Captures and matches fingerprints to authenticate the user. | ₹1,300 |
| Push buttons and switches | 2 | Provide manual inputs and the power switch. | ₹80 |
| Motor driver (L298N) | 1 | Lets the low-current controller run the motors forward, reverse and at variable speed. | ₹180 |
| 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 | 2 | Supplies stable low-voltage power from the mains. | ₹500 |
| Voltage regulator / buck converter | 1 | Provides a steady voltage to the controller and sensors. | ₹80 |
| Passive components, PCB and wiring kit | 1 | Crystal oscillator, transistors / MOSFETs, cables, connectors and jumper wires, diodes, PCB / breadboard, ICs and IC sockets, resistors (assorted) and capacitors (assorted). | ₹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 | ₹3,800 – ₹5,500 |
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 | ₹3,800 – ₹5,500 |
| 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 Biometric Based Exam Gate Authentication System with SMS Alert project?
A fingerprint-controlled exam hall gate. Registered candidates scan their finger to unlock the door, and the admin receives an SMS for each entry; after three failed attempts by an unknown person an alert is sent.
Explain the working of your project in short.
12 V power adapter / step-down transformer and Voltage regulator / buck converter supply the circuit; a regulator gives the controller and sensors a steady 5 V. The Fingerprint sensor captures and matches fingerprints to authenticate the user. The Push buttons and switches provide manual inputs and the power switch. 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.
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 fingerprint sensor match a finger?
It captures an optical image, extracts minutiae points such as ridge endings and bifurcations, and compares them with templates stored in its flash memory. It returns a match ID or failure over UART.
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.
Why can't the motor be connected directly to the microcontroller?
A motor needs far more current (hundreds of mA to amps) than a controller pin can supply (about 20–40 mA). The H-bridge driver switches the motor current and allows direction control.
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.
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 displays the result and drives the actuators. 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, I2C for the display, RTC or motion sensor (only SDA and SCL lines) and analog inputs read by the ADC for the analog sensors. 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.
Related projects
Academic use: Project Buddyy offers mentoring, guidance and reference material for learning. You stay responsible for following your institution's academic integrity rules and for understanding everything you submit.
Want to build Biometric Based Exam Gate Authentication System with SMS Alert?
Send your college, deadline and team size. We confirm the scope, cost and what you will submit.