Building a semi Smart, DIY boat with Arduino and some other sensors

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 float ...

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