Voltage on USB with script - Script Writing - CHDK Forum
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Voltage on USB with script

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Offline morel

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Voltage on USB with script
« on: 24 / September / 2010, 11:11:45 »
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Hi,

is there any way to make CHDK set some voltage (or current) on USB port? If camera doesn't have hotshoe, it could be used to trigger external flash or control other equipement.
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Offline Microfunguy

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Re: Voltage on USB with script
« Reply #1 on: 24 / September / 2010, 11:37:34 »
Quote from: morel on 24 / September / 2010, 11:11:45
is there any way to make CHDK set some voltage (or current) on USB port?

No, not in the standard CHDK build.
I think EWAVR experimented with pulling the USB data lines high and low.

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it could be used to trigger external flash

Anyway, it would be of no use to trigger flash unless it was during a long exposure.

Somewhere in CHDK you can disable preflash, this allows you to use standard slave flashes.

Alternatively, this device allows you to connect external flashes :-

http://www.gentles.ltd.uk/gentstereo/options.htm#PRO

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or control other equipement.


I (and another group member)  have been thinking about creating a product that allows you to do that by flashing an LED.
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