E&TC / ECE · Embedded and digital electronics · Final year project
Smart Digital SchoolBell With Timetable Display
A digital school bell with a timetable display. An STM32 controller rings the bell at programmed times and shows the current period on an LED board, and the timetable is updated from an Android phone over Bluetooth.
What is the Smart Digital SchoolBell With Timetable Display project?
A digital school bell with a timetable display. An STM32 controller rings the bell at programmed times and shows the current period on an LED board, and the timetable is updated from an Android phone over Bluetooth.
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
- ₹2,400 – ₹3,600
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Smart Digital SchoolBell With Timetable Display works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Real-time clock keeps the date and time, even when power is off, for scheduling.
- The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs.
- The Bluetooth module links the circuit to a smartphone app so the user can send commands or receive readings.
- The Buzzer gives an audible alert.
- The LEDs indicate status.
Block diagram
Inputs
Real-time clockController
Arduino Uno R3Communication
Bluetooth moduleOutputs
BuzzerLEDsComponents 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 |
| Real-time clock (DS3231) | 1 | Keeps the date and time, even when power is off, for scheduling. | ₹180 |
| Bluetooth module (HC-05) | 1 | Links the circuit to a smartphone app so the user can send commands or receive readings. | ₹280 |
| 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), 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 | ₹2,400 – ₹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 | ₹2,400 – ₹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 Smart Digital SchoolBell With Timetable Display project?
A digital school bell with a timetable display. An STM32 controller rings the bell at programmed times and shows the current period on an LED board, and the timetable is updated from an Android phone over Bluetooth.
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 Real-time clock keeps the date and time, even when power is off, for scheduling. The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs. The Bluetooth module links the circuit to a smartphone app so the user can send commands or receive readings.
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.
Why use an RTC instead of the controller's timer?
The RTC keeps time on its own coin cell when the main power is off and is far more accurate (DS3231 drifts about 2 ppm), so schedules stay correct.
How does the HC-05 Bluetooth module communicate with the microcontroller?
It uses UART serial at 9600 baud by default. Data typed in the phone app is received by the module and passed to the controller's RX pin as serial characters.
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.
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 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. 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.
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