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Multi-camera setup project.

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Re: Multi-camera setup project.
« Reply #180 on: 17 / September / 2014, 17:41:07 »
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looking good !!!

could u send me pic of your rig ?
I would like to see how u managed to take pic from of the head from top view

thx

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Offline mphx

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Re: Multi-camera setup project.
« Reply #181 on: 17 / September / 2014, 18:59:39 »
looking good !!!

could u send me pic of your rig ?
I would like to see how u managed to take pic from of the head from top view

thx

At last we got the new hubs and some shorter cables , so tomorrow we gonna do some changes on the ring.
I will take some pics tomorrow for you to see.
As far as the top view of the head is concerned , nothing fancy..just the top cameras of every tripod are way far up and looking down.That's not the ideal thing to do but all things considered is the best we can do at the moment.
And since the result is pretty good we will keep them the way they are.

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Offline mphx

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Re: Multi-camera setup project.
« Reply #182 on: 18 / September / 2014, 11:44:52 »
Project went back again because of the newly bought cables.They really sucked...sucked is an understatement.
Three cameras alone were losing connection like crazy.T-H-R-E-E.

We used the cables we already had in three T R I P O D S and were online for half a day.And the new cables couldn't "hold" three cameras alone.pfff

100 euros in cables got wasted.So we gonna get some new cables that we know they work for sure tomorrow.
Hubs seem to be working ok.We ended up in 2 brands and we will stick to them :)

More news tomorrow and if all work ok i will get some pics .

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Offline mphx

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Re: Multi-camera setup project.
« Reply #183 on: 19 / September / 2014, 12:34:27 »
Today was a GOOD DAY :)

We replaced all the sucky cables with new ones and we did a temp connection with all tripods going straight to the pc.System was stable for hours...
So it all comes to good quality cables and hubs and keep them away from power sources :) We wasted too much time and money to find good cables and hubs...

https://www.dropbox.com/s/tck3laxo1b0y6y3/20140919_180904.jpg?dl=0

https://www.dropbox.com/s/dube96zitqhx8mq/20140919_180910.jpg?dl=0

https://www.dropbox.com/s/l1taqja04zyhk6z/20140919_180916.jpg?dl=0

https://www.dropbox.com/s/85qp3mk2thi3pj9/20140919_181020.jpg?dl=0

(I need to learn to get better photos or buy a better mobile phone :) )

We did some test shots and results were great.We will re-arrange some cables that as you see in the photos cross vertically the place and put them around tripods.We just put them like that just for the tests.
After these things we will start doing serious test photos to print some 3d miniatures to display in the studio for the customers to see.
« Last Edit: 19 / September / 2014, 12:36:20 by mphx »


Re: Multi-camera setup project.
« Reply #184 on: 19 / September / 2014, 18:50:29 »
So it all comes to good quality cables and hubs and keep them away from power sources :) We wasted too much time and money to find good cables and hubs...
The key feature of the "good quality" cables that probably matters is the gauge of the shield layer and its ability to carry enough current to equalize variation in ground potentlal between all those floating power supplies you are using.   In other words,  rather than hooking up a common heavy gauge ground bus like I suggested,  you now have cable with enough current carrying capacity to mostly serve the same functions.   If that works for you then it's good enough - but if it was me I would hook up a separate common ground.
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline eponymous

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Re: Multi-camera setup project.
« Reply #185 on: 20 / September / 2014, 20:14:09 »
Poor quality cables are a notorious problem with USB. Not sure how to test them, but they can cause all sorts of problems with drives, etc. They'll work well enough to make trouble. >:(
John

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Offline mphx

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Re: Multi-camera setup project.
« Reply #186 on: 20 / September / 2014, 21:32:33 »
Poor quality cables are a notorious problem with USB. Not sure how to test them, but they can cause all sorts of problems with drives, etc. They'll work well enough to make trouble. >:(

Sadly you can't test them if you don't buy them :) A cable that works well with usb sticks/disks or printers is not guaranteed that will work well with a bunch of cameras.

If you check the photos that i posted , you will see around the tripods on the floor stacks of cables that we used , they didn't work and are going to be a money (and it was time loss too) loss.

Re: Multi-camera setup project.
« Reply #187 on: 20 / September / 2014, 22:29:26 »
If you check the photos that i posted , you will see around the tripods on the floor stacks of cables that we used , they didn't work and are going to be a money (and it was time loss too) loss.
On final time, for the record, I'll point out that with better grounding,  those cables might have worked just fine.
Ported :   A1200    SD940   G10    Powershot N    G16


Re: Multi-camera setup project.
« Reply #188 on: 21 / September / 2014, 02:40:47 »
Ref: Post Re: Multi-camera setup project. « Reply #44 on: 13/July/2014,

http://chdk.setepontos.com/index.php?topic=11667.msg114424#msg114424

Ref: Post Re: Multi-camera setup project. « Reply #150 on: 02/September/2014

@ mphx "...Every camera has the dummy battery kit (chinese one..."

@ mphx "...I don't know about power grounding...i mean if it creates problems or not in my case....i can't check it ...."

Ref: Post Re: Multi-camera setup project. « Reply #152 on: 02/September/2014

@ W-W "...This is almost certainly a grounding problem on the low voltage side..."

Ref: Post Re: Multi-camera setup project. « Reply #154 on: 02/September/2014,

@ mphx "...Pfff it's gonna be messy to ground all these things...

Ref: Post Re: Multi-camera setup project. « Reply #159 on: 02/September/2014,

@ mphx "...And of course is the problem how to sync "hitting shoot" on 4 laptops ....that would be tricky..."

See Attached; Multi-Camera_Array_Concept [Trillinon Dollar] Lp.png

Ref: Post Re: Multi-camera setup project. « Reply #163 on: 03/September/2014

@ mphx "...Lets put your ideas on hold a bit waterwingz..."

@ mphx "...We took apart power cables (chinese one (???)  from usb cables on every tripod.
We didn't tied them up or anything...we just kept them far away apart..."

@ mphx "...Probably there was too much interference from the power cords..."

Ref: Post Re: Multi-camera setup project. « Reply #164 on: 03/September/2014.

@ W-W "...Congratulations! You have just proven exactly what I was trying to tell you..."

Ref: Post Re: Multi-camera setup project. « Reply #182 on: 18/September/2014,

@ mphx "...100 euros in cables got wasted..."

Ref: Post Re: Multi-camera setup project. « Reply #187

@ mphx "...they didn't work and are going to be a money (and it was time loss too) loss..."

@ W-W "...On final time, for the record, I'll point out that with better grounding, those cables might have worked just fine..."

Ref: Post Re: Multi-camera setup project. « Reply #30 on: 12/July/2014,

@ mphx "...I am guessing it wont work as I imagine right?..." (???)

-~+ NO Pain$ +~-    ,,,,    .-= NO Gain$ =-.

See also attached; Multi-Camera_Array_Concept [Trillion Dollar] Lp.png

The "Sneeky Rats" representing your Multi-camera setup project wiring, "RATS NEST" style. (Also used by most of the similar projects).

There are FOUR "Sneeky Rats" representing, (@ MORE;) "Complex Technical issues", in your Multi-camera setup project.

Two of those "FAT" and "Sneeky Rats" are now beaning feed on your hard earned euros/dollars.

ALSO, Note, the comment on "...too much interference...".

H-H's, "50 cents per foot solution", regarding the "too much interference from ... the (chinese one ... (???)".

@ Mr. Google "...Apart from Tungsten ( foil) Copper has the second highest rate of EMI and RFI rejection, I would suggest Copper ( foil)..."

@ Mr. eBay "...Single-sided Conductive Adhesive Copper Foil EMI Shield Tape..." (eBay item number: 141074247289)
"...A MUST HAVE FOR ELIMINATING ELECTRICAL HUM AND NOISE. COPPER FOIL EMI (ELECTROMAGNETIC INTERFERENCE)..."

@ H-H I think that there is, at least, FOUR basic causes of "...too much interference..."

One the absence of proper filtering in the "CHEAP" Switching Power Supplies.
Another is lack of lack of "Foil EMI Shield Tape" on Camera Power Supply Cables.
The third is the absence of proper filtering in your home made battery power adapters. (i.e "HIGH BATTERY INTERNAL RESISTANCE".)
The USB Hubs and Cables are just the Innocent Victim's of EMI noise as per some previous post's on this subject.
Last but not least is those, "Sneeky Rats", see above.

@ H-H "...Congratulations! You have just proven exactly what I was trying to tell you..." and for your "GOOD WORK", "SO FARRRRR" !!!.

BUT.....to be continued, comments anyone.

PS; DON'T THROW AWAY THE ORIGINAL CABLES AND HUBS !!!.

Happy Hacking from H-H
« Last Edit: 21 / September / 2014, 03:00:56 by Hardware_Hacker »

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Offline mphx

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Re: Multi-camera setup project.
« Reply #189 on: 21 / September / 2014, 06:02:08 »
If you check the photos that i posted , you will see around the tripods on the floor stacks of cables that we used , they didn't work and are going to be a money (and it was time loss too) loss.
On final time, for the record, I'll point out that with better grounding,  those cables might have worked just fine.

Probably yes but i will repeat what i said in a previous post.When i have 2-3 tripods with cables brand A working all day , with the current setup , regardless the presence of grounding or not and then we put cables brand B in another tripod , we turn on only 3 cameras on that tripod and the connection is lost constantly every few seconds...then it's all about the cables.

When we have 5-6 tripods working , some cameras with cable brand A and some with cable brand B ...same setup on all cameras/cables and the connection is lost in those cameras with cables brand B , then since the grounding (or the lack of it) is the same to all cameras..we are talking about quality...of the cables ...

Sure if there was a better setup (grounding-wise i mean) any cable could have done the trick...that doesn't cancel the fact that some cables are "better" than others :)


@Hardware_hacker

"One the absence of proper filtering in the "CHEAP" Switching Power Supplies.
Another is lack of lack of "Foil EMI Shield Tape" on Camera Power Supply Cables.
The third is the absence of proper filtering in your home made battery power adapters. (i.e "HIGH BATTERY INTERNAL RESISTANCE".)
The USB Hubs and Cables are just the Innocent Victim's of EMI noise as per some previous post's on this subject."

I don't get what you mean by "home made".Home made from chinese?Because i didn't make anything myself.All components involved are bought.I can't check if what i bought is "home made" or "factory made" :)

I will agree with your last sentence but i will insist in my view that some hubs and some cables are "better" than others.And that fact is shown in the crappiest conditions and by that i probably mean no proper grounding and no proper power adapters.
I have seen hubs from 10-20euros to 60-70euros and cables from 1-2 euros to 400euros (shielded , silver inside , gold in the edges..)
That stuff can't be the same quality and range to that wide costs.

And of course i won't throw anything from the "no good" cables and hubs.Probably they were not up to the task but that doesn't mean that are faulty.They can work well in other cases (sticks,printers,ext. drives , etc etc).
We will try to sell as many as we can and use the rest somewhere else :)
« Last Edit: 21 / September / 2014, 07:58:45 by mphx »

 

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