Are you the type of person that loves playing crazy pranks? Then this Arduino-based remote-controlled water-pistol car should be right up your alley. And guess what? You can use your Android phone to control this sucker!
Mike Winters’ SQUIRT Robot uses sonar and IR sensors to move around and can fire a stream of water at targets of his choosing. The whole kit-and-caboodle is controlled via a custom Android app.
This would have been perfect when I was a 10-year old, so I could have soaked all the girls with this. Thankfully, I had no mechanical inclinations, apart from taking remote controlled cars completely apart, and not being able to put them back together properly. There were always these extra bits that I couldn’t figure out where they went.