Upon reflection, this might be easy.
My trigger is
http://cgi.ebay.com.au/Digital-Radio-Sl ... otohosting
My wireless transmitter has 16 radio chanels, normally selected by a 4 pole DIP switch channel selector and it has an open flash switch as well.
1. put a ACSL-6400-00TE 4-way optocoupler in parallel with the DIP switch.
2. put another single optocoupler in parallel with the pushbutton open flash switch.
Control these 5 optocouplers with a picaxe, with
- input from the camera hot shoe trigger
- 4 outputs to the ACSL-6400-00TE
- 1 output to the single optocoupler
As the hot shoe fires in sync with the continuous shutter, I fire the open flash and cycle through the channels. Representing the state of the 5 optos as F-xxxx (F is the open flash trigger and xxxx is the state of the ACSL-6400-00TE), I repond to 4 exposures like this
1-0000
1-0001
1-0010
1-0011
I have just fired four flashes in sync with 4 frames of a 'motor drive' and sent the radio signal to channels 0, 1, 2 then 3.
Just what I want for gymnastics at a distance.
A refinement would be to have a input DIP switch to control the number of channels to cycle through.
I think it would work, just need to read the doco on the opto-couplers to decide which to use.
Cheers
the Feral Photographer