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building usb-remote-cable

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Offline es_maam

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Re: building usb-remote-cable
« Reply #190 on: 11 / January / 2009, 09:38:38 »
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Thank you fudgey for your explanatios.
Really clarifying.
Definetly I'll try to get maximum 5V.
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Offline bfven

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Re: building usb-remote-cable
« Reply #191 on: 11 / January / 2009, 18:07:41 »
« Last Edit: 11 / January / 2009, 18:46:41 by bfven »
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Offline porktyme

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USB remote cable
« Reply #192 on: 11 / January / 2009, 21:14:19 »
This is my version building on others ideas.  I decided to add a LED light which comes on when the button is pushed.  A great way to know whether the batteries are working.

Significant features:
1)4.5 VDC output
2)Wired directly to the mini-USB cable which plugs directly into camera.  Turns out that some pre-made cables only use the mini-USB for power too.  My old blackberry had one of these cables (YES! just one red and one black wire already there) which I cut for this application.
3)LED light with 150 Ohm resistor.

I can provide a quick schematic if anyone really wants one.  If you can drill two holes, splice wire, and solder then this project is doable.
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Offline showtest

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Re: building usb-remote-cable
« Reply #193 on: 24 / January / 2009, 17:27:27 »
Hello. First post here.
I've been reading up on this and have found the following item:

http://www.dealextreme.com/details.dx/sku.8257

I would assume this would work by simply converting the plug to a mini USB?
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Offline zeno

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Re: building usb-remote-cable
« Reply #194 on: 24 / January / 2009, 17:55:43 »
I doubt it. I think it's just a switch (like the shutter button on the camera) - it won't apply the 3-5v signal needed by CHDK. It may be possible to mount a coin cell battery inside the case of course.
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Offline Jonnyrockit

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Re: building usb-remote-cable
« Reply #195 on: 07 / February / 2009, 22:41:27 »
  But isn't there voltage coming out of the USB cable even when its in remote capture mode?    If its not enough, couldn't you build it up somehow via caps?   I'm working on an SD790is USB remote. I believe I can simply put a switch on a cable and use the cams power to trigger. What do you folks recommend?

-John
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Offline fe50

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Re: building usb-remote-cable
« Reply #196 on: 08 / February / 2009, 04:42:51 »
Quote from: Jonnyrockit on 07 / February / 2009, 22:41:27
  But isn't there voltage coming out of the USB cable even when its in remote capture mode?
The camera's USB port is NOT an USB host and does not supply power - you need "external" power to let the camera notice a connected USB device...
« Last Edit: 08 / February / 2009, 05:31:33 by fe50 »
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Offline Jonnyrockit

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Re: building usb-remote-cable
« Reply #197 on: 08 / February / 2009, 08:21:44 »
 Cool, thanx fe50... I'm mounting a rig on my tripod but for tonight, I used my laptop. I might just do this from now on. I plug into the laptop and she keeps shooting. Looking into the wireless sd cards...You guys know of these?
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Offline fe50

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Re: building usb-remote-cable
« Reply #198 on: 08 / February / 2009, 08:40:10 »
Quote from: Jonnyrockit on 08 / February / 2009, 08:21:44
Looking into the wireless sd cards...You guys know of these?

Eye-Fi --> but it was reported many times that the Eye-Fi cards don't work reliable & continuous;
they often stop after some hours or some 100 images, restarting the camera then is necessary...

The writing speed is also not good, and since this cards do not have a slider to lock the card (make read-only),
either you only use the manual method to start CHDK (with the Firmware Update menu item) or you need a little "hardware mod" on the (expensive) card...

Search for 'eye-fi' in the forum for more informations...
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Offline Jonnyrockit

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Re: building usb-remote-cable
« Reply #199 on: 08 / February / 2009, 09:15:51 »
Sweet... thanks!
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