E&TC / ECE · Robotics and drone · Final year project
ARM Based Liquid Level Detection & Flow Control
An industrial liquid level monitor with automatic flow control. Level sensors in a tank feed an ARM controller, which starts or stops the inlet pump or valve to keep the level within set limits and displays the status.
What is the ARM Based Liquid Level Detection & Flow Control project?
An industrial liquid level monitor with automatic flow control. Level sensors in a tank feed an ARM controller, which starts or stops the inlet pump or valve to keep the level within set limits and displays the status.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Instrumentation
- 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
- ₹2,400 – ₹3,500
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the ARM Based Liquid Level Detection & Flow Control works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Ultrasonic sensor measures distance to an obstacle or a liquid surface using sound echoes.
- 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 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The Buzzer gives an audible alert.
- The LEDs indicate status.
Block diagram
Inputs
Ultrasonic sensorPush buttons and switchesController
STM32 boardOutputs
16×2 LCD with I2C adapterBuzzerLEDsComponents 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 |
| Ultrasonic sensor (HC-SR04) | 1 | Measures distance to an obstacle or a liquid surface using sound echoes. | ₹90 |
| Push buttons and switches | 2 | Provide manual inputs and the power switch. | ₹80 |
| 16×2 LCD with I2C adapter | 1 | Shows readings, status and messages to the user. | ₹220 |
| Buzzer | 1 | Gives an audible alert. | ₹20 |
| LEDs (assorted) | 1 | Indicate status. | ₹20 |
| 12 V power adapter / step-down transformer | 1 | Supplies stable low-voltage power from the mains. | ₹250 |
| Passive components, PCB and wiring kit | 1 | Resistors (assorted), capacitors (assorted), transistors / MOSFETs, cables, connectors and jumper wires, diodes, PCB / breadboard and ICs and IC sockets. | ₹430 |
| 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 | ₹2,400 – ₹3,500 |
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 | ₹2,400 – ₹3,500 |
| 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 ARM Based Liquid Level Detection & Flow Control project?
An industrial liquid level monitor with automatic flow control. Level sensors in a tank feed an ARM controller, which starts or stops the inlet pump or valve to keep the level within set limits and displays the status.
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 Ultrasonic sensor measures distance to an obstacle or a liquid surface using sound echoes. 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.
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.
How does the ultrasonic sensor measure distance?
It sends a 40 kHz pulse and measures the time until the echo returns. Distance = (time × speed of sound 343 m/s) ÷ 2. The HC-SR04 works from 2 cm to about 4 m.
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.
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.
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 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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