Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras - page 9 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum
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Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras

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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #80 on: 19 / October / 2009, 00:17:09 »
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I have a 3.3V 40A power supply. I connected it, and after 4-5 cameras are connected, the rest show a "change batteries" icon or do not turn on.
Now I am really frustrated.
What am I doing wrong ?
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #81 on: 19 / October / 2009, 05:10:07 »
Hmmm .....  this should work.

Have you measured the actual voltage going to the cameras ?

Of course, that supply should not 'droop' with just five cameras turned-on.

I wonder if adding a diode to each +ve supply would help ?

Ideally, a germanium one that only drops 0.3V or maybe there is a potentiometer inside the supply that will allow you to adjust output to 3.9V.

I have sent you a personal message with contact details of someone who has coupled eight cameras.
« Last Edit: 19 / October / 2009, 07:53:08 by Microfunguy »
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #82 on: 25 / October / 2009, 00:29:27 »
I've tested it and it works. Now the next step. I have cameras with power. I have USB cables to trigger them.
Next step, is there a way to remotely download download and perhaps then delete the photos on the camera.

I was thinking of connecting the USB cables via a hub to a PC - then I will have approx 55 USB devices on the pc.

The PC script/program would need to download the pics and once downloaded, delete them on the camera.

Alternatively, I could design an electronic switch that turns on 1,2,3 ...55 cameras and then I could download and delete them individually.

ATM, my solution is to take a device to each camera, remove the SD (and remove the USB cable to access it :-( - ) copy the pics, delete the pics, put back the SD card (and replace the USB cable).

Takes too much time.
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #83 on: 25 / October / 2009, 05:36:03 »
Quote from: zcream on 25 / October / 2009, 00:29:27
I've tested it and it works.

So, how did you wire the cameras ?

Quote
Next step, is there a way to remotely download download and perhaps then delete the photos on the camera.

I have done this with a single camera using WIA-Loader : http://stereo.jpn.org/eng/sdm/upload.htm

There is a problem with multiple cameras of the same model as they have the same vendor and device ID's.

Quote
The PC script/program would need to download the pics and once downloaded, delete them on the camera.

It may be possible to do this using mweerden's PTP code, however ..

Quote
Takes too much time.


exactly !

The same for modifying and testing the PTP code.
However, it is working on my A460 so it may not be too bad.

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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #84 on: 25 / October / 2009, 05:43:51 »
It was wired in parallel - all the Red and Black wires are connected to the same point. So each camera gets a USB pulse at the same point. Every successive camera has a higher delay than the previous one giving the fast movement - slow mo effect.

I hope that only the green and white connectors are used for transferring data.

I thought of using chained USB hubs - but I really think its easier to connect all of them to a switch with at least 55 channels, cycle through each channel and download the pics.

Makes it easier to work with..

Problem is that all SPST and DPST mechanical switches seem to have only 2 or at most 4 switching inputs. Have not seen any electronic IC chip that can do multiple..Should not be that hard though..
Perhaps an IC chip with 256 channels, and each channel is switched on via a bus signal.
Quote from: Microfunguy on 25 / October / 2009, 05:36:03
Quote from: zcream on 25 / October / 2009, 00:29:27
I've tested it and it works.

So, how did you wire the cameras ?

Quote
Next step, is there a way to remotely download download and perhaps then delete the photos on the camera.

I have done this with a single camera using WIA-Loader : http://stereo.jpn.org/eng/sdm/upload.htm

There is a problem with multiple cameras of the same model as they have the same vendor and device ID's.

Quote
The PC script/program would need to download the pics and once downloaded, delete them on the camera.

It may be possible to do this using mweerden's PTP code, however ..

Quote
Takes too much time.


exactly !

The same for modifying and testing the PTP code.
However, it is working on my A460 so it may not be too bad.


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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #85 on: 25 / October / 2009, 05:49:34 »
You can buy 'crosspoint' switches, that are used in telephony I think to route any input to any output.
The connections are arranged in a matrix.

I need to think about this a bit more.
For starters, play with WIA-Loader.
Possibly choose the option for WIA to close on completion and also delete the files on the camera.

Contact me directly if you have any problems, which you probably will.
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #86 on: 25 / October / 2009, 05:54:13 »
They are also known as crosspoint switches.
Here is an example http://focus.ti.com/lit/ds/symlink/sn74cbtlv3125.pdf
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Offline zcream

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Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #87 on: 27 / October / 2009, 05:51:15 »
I decided to use a succession of USB extenders, like the ones on the GEntled website. I will connect right angled USB cables to them and just disconnect the cable and connect it to a small netbook running WIA-Loader to get the pics.
That seems the best option.

On another note I am download the SDM source. I want to set the default as Flash Off, shutter 1/100 and ISO 400 (max value).
I know it can be set manually in the camera by overriding defaults.

Can I setup one camera by overriding defaults to the required settings and then simply copy the new image to the other cameras ? I assume that the changed settings are saved on the flash card so that I can simply copy it over.
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Offline Microfunguy

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Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #88 on: 27 / October / 2009, 11:48:45 »
I have received your personal message and have now replied.


David
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Offline glajciorz

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Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #89 on: 17 / April / 2010, 15:26:51 »
Hi Zcream.

Maybe my hints will help you with your rig.
I'm working on an open-source bullet time rig.
I use 30 Canons A530, each one has its own tripod and LD33CV +3,3V voltage regulator with a heatsink.
Power draw per camera (measured on the primary side) is c.a 400mA with LCD backlight on and c.a 90mA with LCD off.
This gives maximum power draw of c.a. 13A, which my PC PSU can handle. After all LCDs switch off power draw drops to less than 3A.
I power the whole rig with +5V output. This voltage is distributed to each camera  by pairs of 1,1mm wire.
Wire lenghts vary with camera number (from 60 to 530cm in 30cm intervals), so maximum lenght of my rig is c.a. 11m

I hope it will help you a bit.

greetings
Adam
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