E&TC / ECE · IoT · Final year project
IoT Liquid Level Monitoring System
An IoT liquid level monitor for four containers. Ultrasonic sensors measure the level in each, an AVR microcontroller shows it on an LCD and uploads it online, and a buzzer warns before overflow.
What is the IoT Liquid Level Monitoring System project?
An IoT liquid level monitor for four containers. Ultrasonic sensors measure the level in each, an AVR microcontroller shows it on an LCD and uploads it online, and a buzzer warns before overflow.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Instrumentation
- Domain
- IoT 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
- ₹2,100 – ₹3,000
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the IoT Liquid Level Monitoring System 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 NodeMCU ESP8266 Wi-Fi board connects the system to Wi-Fi so readings can be pushed to an IoT dashboard and commands received from a phone.
- The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The Buzzer gives an audible alert.
Block diagram
Inputs
Ultrasonic sensorController
NodeMCU ESP8266 Wi-Fi boardOutputs
16×2 LCD with I2C adapterBuzzerComponents 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 |
|---|---|---|---|
| NodeMCU ESP8266 Wi-Fi board | 1 | Connects the system to Wi-Fi so readings can be pushed to an IoT dashboard and commands received from a phone. | ₹280 |
| Ultrasonic sensor (HC-SR04) | 1 | Measures distance to an obstacle or a liquid surface using sound echoes. | ₹90 |
| 16×2 LCD with I2C adapter | 1 | Shows readings, status and messages to the user. | ₹220 |
| Buzzer | 1 | Gives an audible alert. | ₹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), 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 | ₹2,100 – ₹3,000 |
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 | ₹2,100 – ₹3,000 |
| 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 IoT Liquid Level Monitoring System project?
An IoT liquid level monitor for four containers. Ultrasonic sensors measure the level in each, an AVR microcontroller shows it on an LCD and uploads it online, and a buzzer warns before overflow.
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 NodeMCU ESP8266 Wi-Fi board connects the system to Wi-Fi so readings can be pushed to an IoT dashboard and commands received from a phone. The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
What is NodeMCU and how does it connect to the internet?
NodeMCU is a development board built on the ESP8266 Wi-Fi chip. It joins a Wi-Fi network using the SSID and password in the code and sends data over HTTP or MQTT to a cloud server.
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 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.
How is 230 V AC converted to 5 V DC for the circuit?
A transformer steps down the voltage, a bridge rectifier converts AC to pulsating DC, a capacitor smooths it and a 7805 regulator gives a steady 5 V.
Explain the block diagram of your project.
The input section senses the real-world quantity, the NodeMCU ESP8266 Wi-Fi board processes it according to the program, and the output section acts locally and sends the data or alert wirelessly. 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 and 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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