@waterwingz I'm realizing a 64 camera Rig based on the project started and realized by mphx as described in his thread http://chdk.setepontos.com/index.php?topic=11667.0 where you, reyalp and others had supported him to solve a lot of problems.
I've bought a 4.5V by 2500mA power supply should be enough for 8 cameras.
A you can see in the fotos, I've used a normal bipolar cable (the one normaly used for audio HiFi) thinking the power was not so big to generate signal interference on usb cable (all shielded).
Instead, when I set the cameras to rec mode using the ckdkptp comand:Code: [Select]!return mc:cmdwait('rec')only 3/4 cameras remain connected (I received an I/O error) in a random way. Instead if I connect max 3 cameras everything works correctly.
I've also read in your thread http://chdk.wikia.com/wiki/Shooting_with_Multiple_Cameras_using_CHDK in the Power paragraph: " Be careful about net power draw, grounding and wiring if you go this route.", but I don't know what you mean about wiring and grounding.
I think the problem should be the eddy current, but I'm not aware how to solve it.
Are you worried about the "sync" quality for your project? Or hoping that PTP shooting (using reyalp's sync calibration code) will be enough? If you are going with hardward sync, then in the most recent posts there, I've started to think we have made things too hard by trying to switch all the +5V signals to the cameras seperately.
Are you worried about the "sync" quality for your project? Or hoping that PTP shooting (using reyalp's sync calibration code) will be enough?
Hmmmm ... not sure how you did the math, but in shooting mode you should assume a Powershot will need at least 500mA with peaks to a much as 1A.
... and some heavy wire to connect them ( at least 16 gage).
I'd also recommend running the power wires from each camera all the way back to the power supply - one dedicated run per camera. You seem to have them daisy chained and that could cause problems. Wire length also matters (longer wires being worse) so the closer you can get the power supplies to the cameras the better. Mounting them half way up your poles would probably be optimal.
What are you planning on using for USB hubs ?
I'm using chdkptp multicam lua script and chdk v1.3 stable (build 3947). I do not need extreme syncing since the model stand in the middle of the rig and do not move. I've already realized a prototype with only 5 cameras (I moved around the model to take fotos) that let me scan and 3d print a model dressed as a bride with encouraging results.
@reyalp I've not read all the thread you post me, only first 2 pages, but I did not understand the content. Since it's about 19 pages, can you, in very few words, tell me how it can help me achieving the fake battery structure? How reading the battery temperature can help solve the voltage drop? Thanks in advance.
I based my math on the NB-11L specification (3.6V by 680mAh),
It might simplify the triggering if you need better sync than you can get with pure PTP. In essence, it lets you keep the sync control separate from the USB power.
It sounds interesting, surely I will read all the post so I'll have a more detailed idea about the item. At the moment I have no idea how to integrate this new mode of triggering in my pipeline.
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