These little Arduino boards are a real boon to amateur electronics tinkerers: cheap, versatile, and very small. This guy had the idea to make a high-speed photography setup using one, instead of the more direct circuits usually involved. His reasoning was that the Arduino allows for a lot of easy customization, like for instance hooking up a sound sensor as well as a laser sensor. It allows for failsafes, better timing, and involvement of mixed hardware and software which may in turn control the object drop, speed of projectile, and so on.
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