E&TC / ECE · Healthcare electronics · Final year project
Air Water Pollution Sensing Smart Watch
A wrist-worn smartwatch that measures environmental health as well as time. An STM32 controller reads air quality and gas sensors and pH and turbidity probes for water, showing the readings on a small display so the wearer knows when air or water is unsafe.
What is the Air Water Pollution Sensing Smart Watch project?
A wrist-worn smartwatch that measures environmental health as well as time. An STM32 controller reads air quality and gas sensors and pH and turbidity probes for water, showing the readings on a small display so the wearer knows when air or water is unsafe.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Instrumentation
- 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
- ₹2,500 – ₹3,600
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Air Water Pollution Sensing Smart Watch works
- Rechargeable battery supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Gas / smoke sensor detects LPG, smoke and flammable gas leaks.
- The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs.
- The Buzzer gives an audible alert.
Block diagram
Inputs
Gas / smoke sensorController
Arduino Uno R3Outputs
BuzzerComponents 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 |
| Gas / smoke sensor (MQ-2) | 1 | Detects LPG, smoke and flammable gas leaks. | ₹120 |
| Buzzer | 1 | Gives an audible alert. | ₹20 |
| Rechargeable battery (12 V 1.3–7 Ah) | 1 | Stores energy and supplies power when mains is absent. | ₹650 |
| 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 | ₹2,500 – ₹3,600 |
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 | ₹2,500 – ₹3,600 |
| 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 Air Water Pollution Sensing Smart Watch project?
A wrist-worn smartwatch that measures environmental health as well as time. An STM32 controller reads air quality and gas sensors and pH and turbidity probes for water, showing the readings on a small display so the wearer knows when air or water is unsafe.
Explain the working of your project in short.
Rechargeable battery supplies the circuit; a regulator gives the controller and sensors a steady 5 V. The Gas / smoke sensor detects LPG, smoke and flammable gas leaks. The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs. The Buzzer gives an audible alert.
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.
What is the principle of the MQ-2 gas sensor?
It has a tin dioxide (SnO2) layer heated by a small coil. When combustible gas is present, the layer's resistance falls, which raises the output voltage the controller reads.
What is the difference between an active and a passive buzzer?
An active buzzer has a built-in oscillator and beeps on DC. A passive buzzer needs a square wave from the controller, which allows different tones.
How do you calculate battery backup time?
Backup time (hours) ≈ battery capacity (Ah) × voltage × 0.8 efficiency ÷ load power (W). For example, 12 V 7 Ah at 20 W gives about 3.3 hours.
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?
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). The battery 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 Air Water Pollution Sensing Smart Watch?
Send your college, deadline and team size. We confirm the scope, cost and what you will submit.