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In very basic it is very simple:
1. Shutter open
2. Gun fire
3. Flash to flash
In a bit complicated form it goes like this.
1. I push button to initiate sequence.
2. Micro controller counts to few seconds. Just for safety and my comfort
3. Shutter opens for 0.5 seconds and circuit sends signal to actuator
4. Servo actuator triggers gun and micro controller knows exact time by switch in trigger or hammer (switch happens to be disconnecting I -> 0). Servo actuator has too much fluctuation to trust on that alone.
5. Micro controller counts typical delay of around 500 to 4700 microseconds and triggers flash
6. If nothing failed and theoretical delay met reality I have picture in my camera (D800).
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