Arduino Camera Trigger: water droplets

01.09.2014

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Success!  I’ve spent the past two days photographing water droplets at high speed, with a pretty wide range of results.  The main factors so far have been:

  • Liquid color & viscosity
  • Container width & depth
  • Sensor type
  • Sensor delay

Although the piezo sensor works great when dropping very large drops of liquid or other solid objects into a container, it fails to detect smaller drops of liquid, which is a pretty serious downside.  The laser tripwire will detect small drops of liquid with good success, but the liquid does of course need to be dropped from a very specific location every time.  Mounting the eye dropper in a fixed position would be a good long-term strategy.

Milk has worked better than water since it’s a solid color (and is easily adjusted with food coloring).  Wider containers will give better ripple patterns than smaller ones, and the sensor delay needs to be adjusted based on the depth of the liquid in the container (depending on what type of photo you’re trying to get).

I’ll continue to experiment with the liquid stuff, and will also move on to destroying some things (glassware, etc.) during the rest of the week.  For now, some photos!

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