Regarding Camera Wireless Flash Trigger

sakibnaz wrote:

Thanks Richard B99 for reply.

You’re welcome.

Yes, you was right its TTL signals are Serial Peripheral Interface bus (SPI). I found some detail here.

https://billgrundmann.wordpress.com/2009/03/18/sniffing-canons-ettl-protocol-2/

Yes, BLE may be slow. Surely the others not using Bluetooth. Research about it what will be the best RD for my case.

Anyways, high chance the TTL SPI decide will be very tough things. So at least I'll implement then manual Wireless Flash Trigger. But it will be best if there is any other way to control the Flash Settings (rather TTL). So I can implement remote settings change from Tx end but trigger will be manual in Rx.

I had a couple of further thoughts here about TTL vs manual flash based on my experience that you may find useful:

- you mentioned you need fast flash triggering.  It’s worth mentioning that TTL tiggers, in the scheme of things a good deal slower than manual.  This is because or the pre-flash mini  burst of flashes.  If you want fast with minimum lag on your original trigger signal manual is much better.  Almost the only way to go.  For fastest, it’s probably wired connections but I’ve not noticed any material difference here though have with TTL but I shoot wildlife and not bullets!

- I don’t know your application but I find TTL less useful for off camera multi flash setups.  Modeling with 2 or 3 flashguns (where I typically am) seems to be as easy to do by manual adjustment and you quickly get the hang of what you want to see.  I find I can normally look at the set up, judge flashgun distances, power settings and get it right within a few test shots.  At that point I want the setup to stay the same and not tweak itself with each shot.

- The TTL preflashes can and do affect some of my animal subjects.  The burst is long enough for them to react sometimes.  A single short low power manual flash seems not to bother them.

So in consequence, manual is my preference rather than only option. (I could have easily modified TTL units and cost is not an absolute consideration for me.)  That’s not to say I don’t find TTL useful.  On camera for balanced fill flash I find it very useful.  Thus, you may wish to consider whether going down the TTL route is really necessary for your project.

Is there any standard interface for Flash to control settings ... like Power, Zoom etc? I think no though ...

Er, no.  All proprietary by manufacturer and sometimes changes over time within a mfrs own range.

Regards.

good luck with your project.