building usb-remote-cable - page 47 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum
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building usb-remote-cable

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Offline Stonefire

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Re: building usb-remote-cable
« Reply #460 on: 22 / October / 2013, 14:48:12 »
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Any samples in building a USB-shutter-cable with buildin power suply via USB-wall-plug ?

SIncerly
Stonefire

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Offline waterwingz

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Re: building usb-remote-cable
« Reply #461 on: 22 / October / 2013, 17:18:22 »
Quote from: Stonefire on 22 / October / 2013, 14:48:12
Any samples in building a USB-shutter-cable with buildin power suply via USB-wall-plug ?

The simple way to do this is to take a standard USB computer cable (with a type A connector on one end and a USB mini on the other end),  open up the cable jacket, find the red wire, cut the red wire, and solder a pushbutton switch in the resulting gap in the red wire.



Plug your converted cable into the USB-wall-plug and into your camera and then push the button to take a picture. 

If you want to get fancy,   you can mount the pushbutton switch in any handly plastic container you have laying around.   I use a small empty prescription pill bottle.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline Stonefire

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Re: building usb-remote-cable
« Reply #462 on: 24 / October / 2013, 16:16:13 »
Hi waterwingz

Thanks for your reply. I afterwards realized that my Powershot A495 can't be powered via the mini usb plud.
So I think I'll need to build in a powerplug too. Suddent it getz a bit complicated  :(
but thanks anyway

Sincerly
Steen
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Offline waterwingz

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Re: building usb-remote-cable
« Reply #463 on: 24 / October / 2013, 17:36:52 »
Quote from: Stonefire on 24 / October / 2013, 16:16:13
I afterwards realized that my Powershot A495 can't be powered via the mini usb plud.
I don't believe any P&S camera can be powered that way.  The instantaneous current draw during shooting, lens movements and flash charging can require as much as 2A at time.  Well above the power available on a USB port.

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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline Core781

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Re: building usb-remote-cable
« Reply #464 on: 26 / May / 2014, 21:49:52 »
I'm new to the forum, and I look forward to learning about the firmware.  I'm looking for a wiring description from the context of CHDK advanced script function.  The mini usb2 has 5 pins and I need to know how the wires relate to CHDK and what can be done with CHDK.  Any links to wiring descriptions or diagrams will be appreciated.
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Offline nafraf

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Re: building usb-remote-cable
« Reply #465 on: 26 / May / 2014, 22:01:25 »
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Offline Chelidon

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Re: building usb-remote-cable
« Reply #466 on: 24 / March / 2015, 11:13:32 »
Hi,
I was thinking about a proof of concept to let the remote building process be an obsolete problem.. 8)

I summarize some key points:
  • CHDK now let you to do some interesting things using 5 V signals on the usb to remotly control the camera
  • modern smartphone make possibile some interesting things if one can develop apps
  • some android homemade ROMs (AOSP I know for sure) let you to access USB-VBUS output (yes I'm not talking about the charging process, but the opposite)

So why I have to think how to put a battery (and a 5 V output with batteries means hard to assembly electronics or a heavy parallel circuit) in a remote, when I already have a multitool (smartphone) which could be programmable to send 5 V USB signal by default and be a multipurpose remote?

Thinking about.. :)
« Last Edit: 24 / March / 2015, 12:43:17 by Chelidon »
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Offline zeno

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Re: building usb-remote-cable
« Reply #467 on: 24 / March / 2015, 12:54:59 »
The reason is that what CHDK uses for remote triggering is the two pins that supply power to the USB port. It does not use the data pins. An Android device does give you the ability to send and receive data via USB, but it does not give you the ability to turn the USB power on or off.
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Offline waterwingz

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Re: building usb-remote-cable
« Reply #468 on: 24 / March / 2015, 14:03:44 »
Quote from: zeno on 24 / March / 2015, 12:54:59
The reason is that what CHDK uses for remote triggering is the two pins that supply power to the USB port. It does not use the data pins. An Android device does give you the ability to send and receive data via USB, but it does not give you the ability to turn the USB power on or off.
All true.

But on the other hand,  CHDK script are also capable of communicating over the USB data lines : see read_usb_msg()   and write_usb_msg().   The only catch is that the camera cannot act as the usb host - the android or arduino or PC must take that role.
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Offline Chelidon

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Re: building usb-remote-cable
« Reply #469 on: 30 / March / 2015, 05:24:33 »
Quote from: zeno on 24 / March / 2015, 12:54:59
The reason is that what CHDK uses for remote triggering is the two pins that supply power to the USB port. It does not use the data pins. An Android device does give you the ability to send and receive data via USB, but it does not give you the ability to turn the USB power on or off.
NO, you didn't pay attention to what I wrote:
Quote from: Chelidon on 24 / March / 2015, 11:13:32
some android homemade ROMs (AOSP I know for sure) let you to access USB-VBUS output (yes I'm not talking about the charging process, but the opposite)
I was talking about V+ and V- USB pins and the possibility to control them exploiting the low level on/off voltage  provided by the USB OTG (see here for OnTheGO) with a supported tablet/smartphone device.

In a more pratical explanation: it could be possible to use a OTG supported device with its OTG cable linked to a USB_A=>USB_miniB cable to remote your PowerShoot, in the simplest way that happens by means of attaching and detaching the cable to give a on/off 5V signal over the VBUS pins.

I only need the right cable and a little time to test if it is really possible what I was only thinking about. ;)
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