High-Speed Splash Photography Rig with Arduino | Make:

Photos of items dropping into water (or other liquids) always have the potential to fascinate — the dramatic splashdown, the explosion of flying droplets frozen in time. They’re also increasingly seen in commercial images — look in your local supermarket and there’s a high probability you’ll find an image of a strawberry, chili pepper, or banana hitting the water, captured by a high-speed flash.