sync external flash (light)

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sync external flash (light)

Post by henrique_mg »

I would like to enable and sync external flash (light) to make the photo. How can I do this?

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Re: sync external flash (light)

Post by stereomaton »

I think triggering a commercial flash is done by shorting two pins of its connector (keyword: hotshoe).
However, because it is high voltage (compared to stereopi) you will need to add some electronics between the stereopi and the flash, probably only an optocoupler and resistors. I let you make your search, there are probably some montages for Arduino that would work straight forward with stereopi.
Of course, you will have to add a gpio change in the script that launches the photo capture with an appropriate delay that can be tricky to tune; and I think there is a flag in raspistill to expose for flash light that might be good to add too.
Have fun, and keep us informed of your progress.
Stereophotographer and hacker
Despite my quite active participation in the forum, I am not in the StereoPi team
StereoPi Standard Edition + CM3Lite module + a few cameras

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Re: sync external flash (light)

Post by Realizator »

Hi all!
Sorry for silence - I was forced to be offline for a several days.

You can try to use external flash the same way as with the classic Raspberry Pi.
Here is a guide: ... the-camera
Please also read this comment from 6by9: ... 52#p958970

Also, you need to use StereoPis DTS files, but not stock DTS. You can find our DTS here in our Wiki.
Eugene a.k.a. Realizator

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