E&TC / ECE · Healthcare electronics · Final year project
Automatic Noise Level Monitor & Controller System
A noise meter for classrooms, libraries and offices. A sound sensor measures noise, and when it stays above the set limit a microcontroller sounds a reminder alert and displays the level so the noise can be reduced.
What is the Automatic Noise Level Monitor & Controller System project?
A noise meter for classrooms, libraries and offices. A sound sensor measures noise, and when it stays above the set limit a microcontroller sounds a reminder alert and displays the level so the noise can be reduced.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Instrumentation
- Type
- Final year project · Advanced
- Suitable for
- Diploma capstone and B.E / B.Tech final year
- Build time
- 6 to 8 weeks
- Estimated component cost
- ₹4,900 – ₹7,300
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Automatic Noise Level Monitor & Controller System works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Sound sensor module detects noise level or sound events.
- The Push buttons and switches provide manual inputs and the power switch.
- The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs.
- The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The LEDs indicate status.
- The Buzzer gives an audible alert.
Block diagram
Inputs
Sound sensor modulePush buttons and switchesController
Arduino Uno R3Outputs
16×2 LCD with I2C adapterLEDsBuzzerComponents 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 |
|---|---|---|---|
| Arduino Uno R3 | 1 | Reads the inputs, runs the decision logic written in C/C++ and drives the outputs. | ₹550 |
| Sound sensor module | 1 | Detects noise level or sound events. | ₹70 |
| Push buttons and switches | 1 | Provide manual inputs and the power switch. | ₹40 |
| 16×2 LCD with I2C adapter | 1 | Shows readings, status and messages to the user. | ₹220 |
| LEDs (assorted) | 1 | Indicate status. | ₹20 |
| Buzzer | 1 | Gives an audible alert. | ₹20 |
| 12 V power adapter / step-down transformer | 1 | Supplies stable low-voltage power from the mains. | ₹250 |
| Mild steel frame and fabrication | 1 | Forms the main structure that holds all parts. | ₹2,500 |
| Electrical & Wirings | 1 | Part from the design specification | ₹150* |
| Supporting Rods | 1 | Part from the design specification | ₹150* |
| Passive components, PCB and wiring kit | 1 | Resistors (assorted), diodes, PCB / breadboard, cables, connectors and jumper wires and enclosure, mounts and fasteners. | ₹590 |
| 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 | ₹4,900 – ₹7,300 |
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 | ₹4,900 – ₹7,300 |
| 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 Automatic Noise Level Monitor & Controller System project?
A noise meter for classrooms, libraries and offices. A sound sensor measures noise, and when it stays above the set limit a microcontroller sounds a reminder alert and displays the level so the noise can be reduced.
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 Sound sensor module detects noise level or sound events. The Push buttons and switches provide manual inputs and the power switch. The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs.
What microcontroller is on the Arduino Uno and what are its key specifications?
The Uno uses the ATmega328P: 8-bit, 16 MHz clock, 32 KB flash, 2 KB SRAM, 14 digital I/O pins (6 PWM) and 6 analog inputs with a 10-bit ADC.
How does the sound sensor measure noise?
A condenser microphone converts sound into a small voltage, which is amplified. The analog output rises with loudness and a comparator gives a digital trigger.
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 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 Arduino Uno R3 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?
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.
What is the difference between accuracy and precision?
Accuracy is how close a reading is to the true value. Precision is how close repeated readings are to each other. A sensor can be precise but inaccurate if it is not calibrated.
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Want to build Automatic Noise Level Monitor & Controller System?
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