Build an Internet‑Controlled Video‑Streaming Robot with Arduino & Raspberry Pi

Below is a complete, step‑by‑step guide for assembling a Wi‑Fi‑controlled robot that streams live video and relays sensor data. The design uses a Raspberry Pi 2 B (or any Pi model), an Arduino Uno, an L298N dual H‑bridge, DC motors, a Pi Camera, and optional ultrasonic sensors.

Step 1: Safety Notice

IMPORTANT: This project involves handling electrical components, soldering, and power supplies. If you are not comfortable with these tasks, work under the supervision of an experienced adult. Failure to follow safety procedures may result in equipment damage, personal injury, or fire.

The author disclaims all liability for any loss or damage that may occur. Use common sense and adhere strictly to the instructions.

Step 2: Required Components

• Raspberry Pi – any model will work. We use a Pi 2 B. Two USB ports are needed: one for the Wi‑Fi adapter and one for the Arduino.
• USB Wi‑Fi adapter – connects the Pi to your local network.
• USB‑A to USB‑B cable – links the Arduino to the Pi.
• Arduino Uno – handles sensor input and motor control.
• Optional sensors – e.g., ultrasonic distance sensor for obstacle detection.
• L298N dual H‑bridge – controls the DC motors via PWM from the Arduino.
• DC motors – use identical motors for balanced movement.
• Battery pack for Pi and Arduino – a 5 V 5000 mAh power bank (≥1 A output) is recommended.
• Battery pack for motors – 6 V pack (e.g., 4×AA) or equivalent. Use alkaline cells; rechargeable cells may not supply sufficient current.
• Breadboard and jumper wires – for prototyping without soldering.
• Physical chassis – a non‑conductive base such as plastic or coated metal. Avoid bare metal to prevent short circuits.
• Pi Camera Module – for live video streaming.

All parts can be sourced from major electronics retailers or online marketplaces. The following links provide a starting point:

• GitHub repository
• Project website

Step 3: Reference Material

• Understand the L298N H‑bridge: L298N Overview
• Basic electronics fundamentals: All About Circuits
• Ultrasonic sensor wiring: Arduino Tutorial
• Official Raspberry Pi documentation: Raspberry Pi Docs
• Arduino reference: Arduino Reference
• Python guide: Python Docs

Step 4: Power Management

Before powering the system, calculate the total current draw:

• Raspberry Pi 2 B: ~500 mA
• Pi Camera: ~250 mA
• Arduino Uno: ~150 mA
• Ultrasonic sensor: ~50 mA
• Motor controller & motors: variable (check motor specs)

Approximate base load: 950 mA. A 5 V 5000 mAh power bank that can deliver ≥1 A is adequate for the Pi and Arduino. If your motors draw more than 6 V, connect their supply to the H‑bridge’s 12 V input; the 5 V pin will then serve as a 5 V output.

Step 5: Wiring Diagram

Refer to the schematic in the GitHub repo for detailed connections. Key points:

• Pi’s USB port #1 → Wi‑Fi adapter.
• Pi’s USB port #2 → USB‑A to USB‑B cable to Arduino.
• Arduino pins → H‑bridge control pins (PWM for speed, digital for direction).
• H‑bridge V_IN → motor battery pack (6 V).
• H‑bridge GND → common ground with Pi and Arduino.
• Pi Camera module → CSI port.
• Optional sensors → Arduino analog/digital pins.

Step 6: Pi Network Configuration

Determine the Pi’s IP address:

hostname -I

Ensure the Pi is connected to the same Wi‑Fi network as your controlling computer.

Step 7: Software Setup

1. On the Pi: Install Raspbian OS, enable SSH, and install the Pi Camera drivers. 2. On the Arduino: Upload the provided sketch (found in the GitHub repo) that reads sensor data, sends commands via serial, and drives the H‑bridge.

The Pi runs a lightweight TCP server that streams the camera feed and accepts control commands. The server listens on a configurable port (default 5000). The Python script video_stream.py handles video capture and socket communication.

3. On the controlling PC: A simple GUI written in Python with PyQt (or any other framework) can connect to the Pi’s IP, display the video, and send motor commands.

Step 8: Assembly

Mount the Pi, Arduino, H‑bridge, and battery packs on the chassis. Secure all components with zip ties or double‑sided tape. Connect the motor wheels to the DC motors and mount the motors onto the chassis. Attach the camera to the front of the robot for a forward‑looking view.

Before powering on, double‑check all connections for shorts and correct polarity. Once verified, supply power to the Pi/Arduino first, then the motors.

Step 9: Testing & Troubleshooting

• Boot the Pi and confirm the camera streams on the controlling PC.
• Test each motor direction individually using the control GUI.
• Verify sensor data appears in the terminal; adjust code if values are inconsistent.
• Check for overheating; if the battery or H‑bridge feels hot, add a heatsink or reduce motor load.

Step 10: Licensing & Credits

This project’s software is licensed under GPL v3. The license permits use, modification, and redistribution, provided the same license terms are maintained. All third‑party libraries used are licensed accordingly.

Special thanks to the Raspberry Pi, Arduino, and open‑source communities for providing the hardware and software foundations that made this project possible.

Feel free to fork the repository, suggest improvements, or share your own variations!