With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts. I used a polymorph extruded tube to pass give structure and pass the motors' wires and insulating tape just to support the box. If you use a motoruino, you just have to connect the battery and motors' wires to the board. This will show you how to build a robot boat from cheap and easy to use materials, I think it is also a good example of reusing water bottles. I used two water bottles, polymorph plastic, two motors and propellers, tape, a box, a battery and a motoruino (Arduino clone designed to work with motors, servos and sensors). Take out the bottle cap and insert the motor on its mouth (you can use some insulating tape if you see that there is space between the motor and the plastic).
Put the cap on the bottle and feed the wires into the bottle opening, then out the slit that you just made. You can download some super simple premade code I wrote to give the boat basic functionality.
This easy build uses two important scientific principles, buoyancy and stored kinetic energy, to float and drive a simple boat.

PartsRubber Bands, Large enough to span the diameter of the soda bottle, and rigid enough to wind up and provide drive. Send us feedback on our site design, bugs, story ideas, maker community events and any other share-worthy thoughts. This robot boat was originally built for a Thai art contest, for the 2006 Loy Krathong celebration. The rule of thumb is to imitate the shapes of actual boats, as they have been well tested by real engineers. Examples of flat bottom boats might be Jon boats, small utility boats, and some high--speed runabouts.
The bottom of my hull was completely flat, as making other shaped hulls can cause complications. The Royal Thai Barges use human paddlers for actuation, but that wasnt possible for the robot so I need another method. Just to emphasize once more, my paddle wheel design is not optimal and was based on artistic value over functionality.
If you use a normal arduino you will have to use a shield or mount the h-bridge on a breadboard.

I used Arduino as a microcontroller, an ultrasonic sensor in the front, a few simple switches on the side of the boat, and a few light sensors on either side.
The parts are all readily available around most homes, and the boat can be assembled in minutes, though a bit more time with waterproof markers can add some style to the outcome.
It’s the plastic paddle part that I will likely get stuck on not being able to figure the correct sizing.
I don't know of anyone who has had a problem with water entry through the stuffing box if the lube was applied properly. Consider experimenting with additional components like fins for stabilization, to improve the performance. This will be the width (W) of your paddle pieces.Add 1” to measurement of the spacing between the sticks and that will be the length (L) of your paddle pieces. These will act as outriggers, and maxize the paddles' effectiveness.Wind the paddle counter-clockwise, turning the paddle over the top of its rotation to the right of the "top" of your boat.Set your boat into a pool or other body of water, and let it go!

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