Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras - page 11 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum

Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras

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to send the impulse from 3V lithium battery to all of the cameras (no kidding - I thought a separate power supply will be needed).

If you measure the resistance from the cameras USB V+ terminal to ground (in other words, across the two outer conductors) you will see it is tens of kilohms resistance.

So, even 1/30 of that is only about 1K, very briefly drawing 3mA from the lithium battery.


David

I used channel alum - about 1m long. And put 3-4 cameras per channel. Hence I will use 1 tripod per 3 cameras.
I have the 2.1mm connectors done already. I used 10A cabling from Auto electricals. So the drop on the cabling should be negligible.
I used really cheap auto contacts - 100 for 5 bucks for connecting the wires. They are called spade  connectors.
I think the only thing missing was the regulator -  just bought 100 from digikey.

Dont they come already with a heatsink ? Do I need an extra heatsink ?
Hi Zcream.

Good you've found the regulators. I bought mine here, in Poland.
I also needed 200m of 1,1mm wire, 30 heatsinks (from VGA cards), 30 2,5mm (or 2mm, check me) external power plugs for Canon, 30 USB cables that usually come with camera, 30 USB sockets (like the ones found in PCs) and 11m of double 3mm audio wire to send the impulse from 3V lithium battery to all of the cameras (no kidding - I thought a separate power supply will be needed).

greetings
Adam

P.S. Zcream, what will be the frame for your rig ?
CHDK used for a Bullet-time sequence
Welcome to mishra.tv productions

Hi Zcream.

You need extra heatsink. I doesn't have to be big. 3x3 cm will suffice.
Mine were glued to metal side of the regulator. You could use screw connection and thermoconducting goo for PCs processors as well.

greetings
Adam

To drive your rigs outdoors from a lead acid battery, these are ideal :-

http://cpc.farnell.com/jsp/level5/module.jsp?moduleId=cpc/263605.xml


Hi Microfunguy. I had looked into these - cheaper on ebay. However the low 2A current rating a bummer.
CHDK used for a Bullet-time sequence
Welcome to mishra.tv productions

Surely 2A is enough for each camera ?

How did you find them on Ebay, what Search term did you use ?


David

Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #106 on: 29 / January / 2011, 09:11:33 »
Ok! the project is back on.
For the last question. 12V to USB adapters are common. The camera should still work with the 5V on USB. Less than 2 bucks with a car USB adapter.

As a record (for me, if for no one else), the script will have



>>
Rem TODO:- turn lcd off for power use click display twice??
click "display"
click "display"

Rem Turn flash off
click "up"
Rem Set Aperture at wide open
set_av 9
Rem set shutter at 1/100 - PAL
set_tv 20
Rem set zoom at widest
set_zoom 0
Rem set ISO at highest - since I'm shooting indoors
set_iso 5
Rem set focus in mm - 5m -infinity for the small sensor?
set_focus 5000
Rem Click picture
shoot
Rem At the end shut down - will the USB trigger wake up A450 and A460 ?
shut_down

>>
CHDK used for a Bullet-time sequence
Welcome to mishra.tv productions

Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #107 on: 29 / January / 2011, 15:50:30 »
Hurrah !

No, the USB trigger will not wake-up the cameras.

The only way is to tape-down the shutter buttons and turn-on the external supplies.


Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #108 on: 21 / February / 2011, 05:57:18 »
As an update, I built a PCB using Eagle, and am currently working on this forum here..
http://arduino.cc/forum/index.php/topic,50437.0.html
CHDK used for a Bullet-time sequence
Welcome to mishra.tv productions

Re: Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« Reply #109 on: 21 / February / 2011, 07:47:48 »
As an update, I built a PCB using Eagle, and am currently working on this forum here..
http://arduino.cc/forum/index.php/topic,50437.0.html

and

Quote
The camera is running CHDK firmware and is triggered with a 5V pulse. I want each camera to have a 10ms delay over the previous one.


SDM does that, menu option.


 

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