I based this off of this really nice instructables.com post for building a water bottle boat, with some additions for obstacle avoidance and light-guided control. 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.  See here for a few more photos or here for a pdf step by step.

This simple little floating boat bounces off walls, can be steered with a flashlight, and won't hit something head-on. 


hot glue + glue gun (silicon optional)
two small DC motors
two water bottles
two small propellors
arduino + USB cable + computer
wire strippers
a plastic box 
a 9V battery + a connector
a power diode (like 1n4004)
some resistors
 a soldering iron + solder
a MOSFET transistor or TIP 120
2 few switches + 2 photocells
<p>I tried to do this project with two 3V DC motors and used a 9V battery to power the Arduino. However, the 9V battery drained fast in about 10 minutes when the Arduino is running the 3V DC motors through the 3.3V pin, how can I solve this problem? </p>
Haha, I hate this kind of spaghetti! Good job on this creation and your SNEEL! Love them both.
I'm a bit fan of the simplicity. I'm surprised the hot glue trick works for the motor-shaft. Definitively a tip I'll be trying to store away and remember.
Nice project. <br> <br>You have a picture when its floating? I'm trying to picture it floating and wonder if the water leaks through the motor shaft holes, unless the shafts remain above water. How do the bottles remain air/water tight with said shaft holes? <br> <br>I would like to see a video showing how it moves under its own control.
I race fast electric R/C boats. We put lube in the stuffing box (the tube the prop shaft goes through). I don't know of anyone who has had a problem with water entry through the stuffing box if the lube was applied properly.
I'm sorry for asking a petty question: but how did you create the nice design of the arduino with the wires and other misc. components. I've seen other authors add these to their &quot;ables&quot;. I would like to know so I could create my own. <br>Great instructable by the way!
Thank you peptidefarmer
Very nice project! And very good recycling of materials.
where code?
love your project... good use of on hand materials... nice job

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