sync external flash (light)

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henrique_mg
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Joined: Sat Jul 13, 2019 5:10 pm

sync external flash (light)

Post by henrique_mg » Thu Jul 25, 2019 9:29 pm

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

stereomaton
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Location: France

Re: sync external flash (light)

Post by stereomaton » Fri Jul 26, 2019 8:46 am

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

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Realizator
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Re: sync external flash (light)

Post by Realizator » Fri Jul 26, 2019 9:03 am

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: https://picamera.readthedocs.io/en/rele ... the-camera
Please also read this comment from 6by9: https://www.raspberrypi.org/forums/view ... 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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