E&TC / ECE · RFID, smart card and biometric · Final year project
Auto Billing Mall Shopping Cart 8051
A smart shopping trolley that bills items as they are added. An RFID reader controlled by an 8051 microcontroller reads each product's tag, and the LCD shows the item price and running total, so the shopper avoids billing queues.
What is the Auto Billing Mall Shopping Cart 8051 project?
A smart shopping trolley that bills items as they are added. An RFID reader controlled by an 8051 microcontroller reads each product's tag, and the LCD shows the item price and running total, so the shopper avoids billing queues.
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 – ₹3,500
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Auto Billing Mall Shopping Cart 8051 works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Push buttons and switches provide manual inputs and the power switch.
- The 8051 microcontroller with board runs the embedded C program that scans inputs and controls the outputs through its four I/O ports.
- The RFID reader with tags reads the unique ID of an RFID card or tag held near it so the system can identify the user or item.
- The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The LEDs indicate status.
Block diagram
Inputs
Push buttons and switchesController
8051 microcontroller with boardCommunication
RFID reader with tagsOutputs
16×2 LCD with I2C adapterLEDsComponents 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 |
|---|---|---|---|
| 8051 (AT89S52) microcontroller with board | 1 | Runs the embedded C program that scans inputs and controls the outputs through its four I/O ports. | ₹300 |
| Push buttons and switches | 2 | Provide manual inputs and the power switch. | ₹80 |
| RFID reader (RC522) with tags | 1 | Reads the unique ID of an RFID card or tag held near it so the system can identify the user or item. | ₹220 |
| 16×2 LCD with I2C adapter | 1 | Shows readings, status and messages to the user. | ₹220 |
| 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 | Crystal oscillator, resistors (assorted), capacitors (assorted), transistors / MOSFETs, cables, connectors and jumper wires, diodes, PCB / breadboard and ICs and IC sockets. | ₹445 |
| 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 Auto Billing Mall Shopping Cart 8051 project?
A smart shopping trolley that bills items as they are added. An RFID reader controlled by an 8051 microcontroller reads each product's tag, and the LCD shows the item price and running total, so the shopper avoids billing queues.
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 Push buttons and switches provide manual inputs and the power switch. The 8051 microcontroller with board runs the embedded C program that scans inputs and controls the outputs through its four I/O ports. The RFID reader with tags reads the unique ID of an RFID card or tag held near it so the system can identify the user or item.
What is the architecture of the 8051 microcontroller?
The 8051 is an 8-bit Harvard-architecture microcontroller with 4 KB ROM (8 KB in AT89S52), 128 bytes RAM, four 8-bit I/O ports, two 16-bit timers, a UART and five interrupt sources.
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.
How does RFID work?
The reader produces a 13.56 MHz (or 125 kHz) field that powers the passive tag through induction. The tag replies with its stored unique ID, which the controller compares with its list of authorised IDs.
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.
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 8051 microcontroller with 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?
I2C for the display, RTC or motion sensor (only SDA and SCL lines) and SPI for the RFID reader or radio module. 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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