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Actually, pics like these can be made much more simply. You need only a water container with a valve which can be set to create single drops at a modest rate. The drops fall thru a beam from a laser pointer falling on a photo cell. That is your “T=0” reference, and you only need to adjust the delay from that time until you trigger the camera. It is usually no problem to send the camera trigger signals before it is finished with the last one. You need to write no code, unless that is what turns your crank. I used a 555 timer and an adjusting pot with a knob.