Aquatic Automation: Arduino Bluetooth Boat

Building a wheeled robot rover on your desk is the standard Arduino path. Taking that robot into the water introduces massive, catastrophic risk. The Arduino Bluetooth Boat forces you to grapple with absolute waterproofing techniques, mastering differential motor thrust (tank steering) instead of using standard servo rudders to execute high-speed aquatic maneuvers.

Dual Thrust Vectors (Differential Steering)

Many cheap RC boats use one propeller and a tiny servo pushing a plastic rudder flap to turn. This boat utilizes "Tank Steering" in the water.

1. The Architecture: You mount a high-speed submersible DC motor on the Left pontoon and the Right pontoon. There is no rudder.
2. The Arduino connects to the smartphone via the HC-05 Bluetooth Module.
3. The Control Matrix (L298N Driver):
   • To sail straightforward: Both Left and Right motors spin forward simultaneously using full PWM: analogWrite(LeftM, 255); analogWrite(RightM, 255);.
   • To spin furiously in a circle: The Arduino commands the Right Motor forward at 255, and throws the Left motor entirely into reverse! This violent differential torque causes the hull to pivot perfectly on its own axis!

Waterproof Containment Crucials

Water crossing a 12V L298N Motor Driver chip will instantly cause the lithium battery to explode.

• Silicone Conformity: Every wire passing out of the boat's plastic hull must be entirely sealed using marine-grade silicone.
• The Stuffing Box: The metal shaft between the spinning propeller in the water and the electric motor resting safely inside the hull must run through a brass tube violently packed with marine axle grease to completely block water intrusion!

Naval Construction Base

• Arduino Uno/Nano + HC-05 Bluetooth transceiver.
• L298N or TB6612FNG Dual Bridge Motor Driver Module.
• Two high-speed brushed 130-size DC motors or Coreless drone motors.
• Two marine propellers (One left-pitch, one right-pitch) and brass drive shafts.
• A 3D-Printed Catamaran Hull or foam blocks.