multiple cameras with a usb hub - General Help and Assistance on using CHDK stable releases - CHDK Forum
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multiple cameras with a usb hub

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Offline mrgonuts

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multiple cameras with a usb hub
« on: 11 / March / 2021, 11:08:19 »
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hi can i use a hub to fire 3 cameras i searched the forum but didn't find answer  thanks
https://imgur.com/gallery/UV8WOKj
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Offline reyalp

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Re: multiple cameras with a usb hub
« Reply #1 on: 11 / March / 2021, 12:39:35 »
Quote from: mrgonuts on 11 / March / 2021, 11:08:19
hi can i use a hub to fire 3 cameras i searched the forum but didn't find answer  thanks
https://imgur.com/gallery/UV8WOKj
If you mean using the USB remote (https://chdk.fandom.com/wiki/USB_Remote), switching the power on a powered hub that's not connected to a computer should be fine.

If the hub were also connected to a computer, that would power the ports regardless of the external power.
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Offline mrgonuts

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Re: multiple cameras with a usb hub
« Reply #2 on: 11 / March / 2021, 15:23:48 »
Hi thanks for the reply
yes the hub will be fed from a usb power bank 5v
so that way i can just put the switch in between the hub and the power supply saves cutting up so many usb cables and that way i can use different length cables for each camera if need.
thanks again
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Offline waterwingz

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Re: multiple cameras with a usb hub
« Reply #3 on: 11 / March / 2021, 18:37:21 »
Quote from: mrgonuts on 11 / March / 2021, 15:23:48
yes the hub will be fed from a usb power bank 5v
so that way i can just put the switch in between the hub and the power supply saves cutting up so many usb cables and that way i can use different length cables for each camera if need.
The caveat here is the design of the USB hub.  Once you cut power to the hub, any internal capacitance on the +5V line will need to self discharge.  If that does not happen quickly, the slow ramp down of the +5V could cause the three (or more) cameras to actually trigger at slightly different times.  You'll have to test and see if that slight variation is critical to your application or not.
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Offline mrgonuts

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Re: multiple cameras with a usb hub
« Reply #4 on: 12 / March / 2021, 04:49:37 »
ok thanks I've ordered a cheep hub when it comes ill test it out and report back
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Offline mrgonuts

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Re: multiple cameras with a usb hub
« Reply #5 on: 16 / March / 2021, 07:38:10 »
Hi i ordered this cheap hub £2.80
https://www.ebay.co.uk/itm/HIGH-SPEED-4-PORT-USB-HUB-2-0-MULTI-SPLITTER-EXPANSION-DESKTOP-PC-LAPTOP-ADAPTER/313444372692?var=612299326891
works great cameras fire tougher thanks for this great software and your help
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Offline MaxGill

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Re: multiple cameras with a usb hub
« Reply #6 on: 17 / March / 2021, 04:41:30 »
Thx you for answers, now i know that i will not buy it!! :D
« Last Edit: 18 / March / 2021, 20:37:44 by MaxGill »
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