E&TC / ECE · Solar and power electronics · Final year project
Automatic Bubble Maker With Speed Control
A motorised soap bubble machine with two speed settings. A rotating wheel dips into soap solution and a blower creates bubbles continuously, powered by a battery.
What is the Automatic Bubble Maker With Speed Control project?
A motorised soap bubble machine with two speed settings. A rotating wheel dips into soap solution and a blower creates bubbles continuously, powered by a battery.
Key facts
- 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
- ₹5,300 – ₹7,700
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Automatic Bubble Maker With Speed Control works
- Rechargeable battery supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Microcontroller board processes sensor inputs and controls the outputs according to the program.
- The DC geared motor provides the driving motion.
- The DC cooling fan moves air for cooling or ventilation.
Block diagram
Controller
Microcontroller boardOutputs
DC geared motorDC cooling fanComponents 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 |
|---|---|---|---|
| Microcontroller board | 1 | Processes sensor inputs and controls the outputs according to the program. | ₹400 |
| DC geared motor | 2 | Provides the driving motion. | ₹500 |
| DC cooling fan (12 V) | 1 | Moves air for cooling or ventilation. | ₹120 |
| Rechargeable battery (12 V 1.3–7 Ah) | 1 | Stores energy and supplies power when mains is absent. | ₹650 |
| Mild steel frame and fabrication | 1 | Forms the main structure that holds all parts. | ₹2,500 |
| Liquid Tub | 1 | Part from the design specification | ₹150* |
| Passive components, PCB and wiring kit | 1 | Enclosure, mounts and fasteners, resistors (assorted), capacitors (assorted), PCB / breadboard and cables, connectors and jumper wires. | ₹610 |
| 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 | ₹5,300 – ₹7,700 |
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 | ₹5,300 – ₹7,700 |
| 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 Bubble Maker With Speed Control project?
A motorised soap bubble machine with two speed settings. A rotating wheel dips into soap solution and a blower creates bubbles continuously, powered by a battery.
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 Microcontroller board processes sensor inputs and controls the outputs according to the program. The DC geared motor provides the driving motion. The DC cooling fan moves air for cooling or ventilation.
What is the difference between a microprocessor and a microcontroller?
A microprocessor is only a CPU and needs external memory and I/O chips. A microcontroller has the CPU, RAM, ROM, timers and I/O on a single chip, which makes it cheaper and better for dedicated control tasks.
Why is a geared motor used?
The gearbox reduces speed and multiplies torque, so a small DC motor can move a vehicle or mechanism smoothly. Torque increases roughly by the gear ratio.
How can fan speed be varied?
With PWM through a MOSFET: changing the duty cycle changes the average voltage and therefore the speed.
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.
Why is mild steel used for the frame?
It is cheap, strong, easy to cut and weld and widely available. A frame of 25 mm square pipe is enough for most student models.
Explain the block diagram of your project.
The input section senses the real-world quantity, the Microcontroller 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?
The sensors give digital or analog signals read directly by the controller's I/O and ADC pins, and outputs are driven through transistor or relay drivers.
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.
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 Automatic Bubble Maker With Speed Control?
Send your college, deadline and team size. We confirm the scope, cost and what you will submit.