E&TC / ECE · Robotics and drone · Final year project
Long Range Spy Robot With Obstacle Detection
A phone-controlled spy robot that stops automatically before hitting obstacles. DTMF commands from a call drive it over any distance, and an obstacle sensor halts it when something is in the way.
What is the Long Range Spy Robot With Obstacle Detection project?
A phone-controlled spy robot that stops automatically before hitting obstacles. DTMF commands from a call drive it over any distance, and an obstacle sensor halts it when something is in the way.
Key facts
- Branch
- Electronics & Telecommunication (E&TC / ECE); also suits Mechatronics
- Type
- Final year project · Advanced
- Suitable for
- Diploma capstone and B.E / B.Tech final year
- Build time
- 6 to 8 weeks
- Estimated component cost
- ₹6,800 – ₹10,100
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Long Range Spy Robot With Obstacle Detection works
- Rechargeable battery 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 Camera module captures images or video for recognition and monitoring.
- The 8051 microcontroller with board runs the embedded C program that scans inputs and controls the outputs through its four I/O ports.
- The DC geared motor provides the driving motion.
- The Motor driver lets the low-current controller run the motors forward, reverse and at variable speed.
- The LEDs indicate status.
Block diagram
Inputs
Ultrasonic sensorCamera moduleController
8051 microcontroller with boardOutputs
DC geared motorMotor driverLEDsComponents 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 |
| Ultrasonic sensor (HC-SR04) | 1 | Measures distance to an obstacle or a liquid surface using sound echoes. | ₹90 |
| Camera module | 1 | Captures images or video for recognition and monitoring. | ₹650 |
| DC geared motor | 2 | Provides the driving motion. | ₹500 |
| Motor driver (L298N) | 1 | Lets the low-current controller run the motors forward, reverse and at variable speed. | ₹180 |
| LEDs (assorted) | 1 | Indicate status. | ₹20 |
| Rechargeable battery (12 V 1.3–7 Ah) | 1 | Stores energy and supplies power when mains is absent. | ₹650 |
| Robot chassis (metal / acrylic) | 1 | Needed for this type of build. | ₹1,100 |
| Wheels / castor wheels | 4 | Allow the machine or vehicle to move. | ₹1,600 |
| Li-ion battery pack (18650 × 3, 11.1 V) with BMS | 1 | Needed for this type of build. | ₹1,400 |
| 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 | ₹6,800 – ₹10,100 |
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 | ₹6,800 – ₹10,100 |
| 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 Long Range Spy Robot With Obstacle Detection project?
A phone-controlled spy robot that stops automatically before hitting obstacles. DTMF commands from a call drive it over any distance, and an obstacle sensor halts it when something is in the way.
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 Ultrasonic sensor measures distance to an obstacle or a liquid surface using sound echoes. The Camera module captures images or video for recognition and monitoring. The 8051 microcontroller with board runs the embedded C program that scans inputs and controls the outputs through its four I/O ports.
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.
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.
How is the camera image processed?
Frames are captured and processed with OpenCV: converted to grayscale, filtered and passed to a detection or recognition model that labels faces, objects or number plates.
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.
Why can't the motor be connected directly to the microcontroller?
A motor needs far more current (hundreds of mA to amps) than a controller pin can supply (about 20–40 mA). The H-bridge driver switches the motor current and allows direction control.
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 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.
Is your system open-loop or closed-loop?
Closed-loop: sensors measure the actual position, distance or condition and the controller corrects the actuators until the target is reached.
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