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Wifi Flash Trigger & High Voltage High speed flash

I built a flash trigger for doing high speed photography. I didn't really want to build a whole UI and display for the thing, so I used an ESP8266 module + arduino for doing the control. It's a little bit of a headache to use your phone + wifi to control it, rather than on-widget control, but it's much easier to build the hardware and display. No switches, buttons, displays, etc.

Flash duration:

To do high speed photography, you can buy a high speed camera (pretty reasonably priced at $2500 from here: https://www.kickstarter.com/projects/1714585446/chronos-14-high-speed-camera. This is video. To get even high speed single shots, you can use a fast flash.

My regular speedlite flash has the following flash durations:

| Exposure | Duration (uS) |
| 1/128    |  25.6         |
| 1/64     |  37.6         |
| 1/32     |  57.6         |
| 1/16     |  100.8        |
| 1/8      |  163.6        |
| 1/4      |  327.4        |
| 1/2      |  750.0        |
| 1/1      |  Kind of indeterminate because it's not shut off abruptly.  About 1.6mS to 1/2 power, but continus on to maybe 4mS|