Water Drops circuit

Posted on Feb 6, 2014

water drops. I`d always been drawn to time-lapse and macro photography, and it seems that the obiquitous water-drops are a common first step into this strange and wonderful photographic world. In researching it further however, it quite quickly became apparent that there would be more to this project that met the eye; the action takes place in a fraction of a second in a tiny space no

Water Drops circuit
Click here to download the full size of the above Circuit.

more than 18 inches or so from your camera lens. Presented with these challenges, it seemed to me (and undoubtedly many before me) that there would be two ways you could go about photographing these tiny splashes. The first is simply to fix up your camera on a tripod, set up a reasonably predictable source of water drops and fire away at it. There are many people who have achieved great success with this approach, however not being blessed with the greatest amount of patience, I wanted to increase my hit rate. It`s for this reason that I went for the second approach; to control as many of the variables as possible using any and all tricks I could put my mind to. The challenge would therefore be to build, find or scrounge a detector that would be able to detect the moment a falling water drop began it`s descent, and then to wait a configurable period of time before triggering the camera`s flash and/or shutter - in other words a photogate/delay timer circuit. There are kits available such as those from HiViz. com, however I felt that the delay timers on these circuits were a little less controllable than I would like, and with my programming skills being somewhat better than my electronics skills, I decided to build a programmable circuit based on the Arduino Microcontroller. Additionally, controlling the delay timer from a PC or laptop would give me millisecond accurate control, and it would be much more repeatable than the...

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