After having seen so many great photos of what I later learned was high speed photography I wanted to make some myself. I had so many ideas but all of my first experiments failed due either the delay of the shutter release (the time it takes for the camera to actually take the picture) or the limits of the flash synch.
Once I had understood the basic concepts; the fact that the extremely short exposures are not made using the camera but rather the burn time of the flash I started to look for hardware solutions to solve my needs. There were a couple of nice products available but I thought it should be possible to make one cheaper myself and then I could also modify it to my needs.
Velleman is a company that develops small circuit boards for home assembly and they have a product called MK139 – it is a clap on/off switch that you can use to control lights etc. After assembly it turned out that the delay after a clap until the relay closed the circuit was not useful.
The project grew and I replaced the PIC processor that came with the kit with a PIC12F683 and wrote some code to make it work. Once this was done I wanted to be able to control the time between the “clap” and when the flash fired so I added a trim-resistor and modified the code for it. If you want to do this yourself I put the code on https://github.com/reveman/mk139_and_PIC12F683.