Section outline

  • Tips, Safety, and Troubleshooting

    Before wrapping up your wireless robot project, it’s important to follow good practices for safe usage, effective communication, and smooth troubleshooting. This section highlights useful tips that will help you avoid common mistakes and keep your robot running reliably.

    • 🔒 Safe Handling of Bluetooth Modules

      • Voltage Limits: Most Bluetooth modules (like HC-05) operate at 3.3V on RX. If using with a 5V Arduino, use a voltage divider or level shifter.
      • Heat Awareness: Modules may heat up during extended use. Avoid touching them while powered for long periods.
      • Antenna Care: Avoid bending or crushing the onboard antenna to maintain strong signal quality.

       

    • 🛠 Common Errors and How to Fix Them

      • Robot Not Responding: Check Bluetooth pairing, ensure power supply is stable, and verify command strings from the app.
      • Upload Error: Disconnect the Bluetooth module during code upload to Arduino (TX/RX interfere with uploading).
      • App Controls Wrong Action: Review your code to ensure each character sent from the app matches the right function in Arduino logic.
      • Random Movements: This could be caused by poor signal or incorrect command interpretation. Add Serial Monitor print statements for debugging.

      📶 Improving Range and Reliability

      • Line of Sight: Keep your phone in direct line of sight with the robot for best Bluetooth performance.
      • Distance: HC-05 typically works well up to 10 meters in open space. Avoid walls or metal obstacles.
      • Shielding: Place the Bluetooth module away from motor wires and power sources to reduce electrical interference.
      • App Lag: Use lightweight commands (single characters) for faster transmission and less processing delay.

      By following these tips and safety checks, you'll create a more robust and enjoyable robotics experience. You’re now fully ready to build wireless robots with confidence!