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360 degree camera

Posted: Tue Jul 07, 2015 11:19 am
by seregus
Hi all,

I'm trying to find a solution in creating a 360 degree free rotating camera.
The main problem is of course - ribbon cable, due to after a couple of turns it will obviously become a problem.
I've discovered Slip Rings and they seems to fit idea nicely, but they all have no ribbon cables, but regular once (like even 12 cables passing).
Question is - is it actually doable?

Thank you everyone in advance!

Re: 360 degree camera

Posted: Tue Jul 07, 2015 3:07 pm
by thagrol
You could try mounting the pi and the camera on a slip ring as a unit. Use the slip ring to carry power and wifi rather than wired ethernet to talk to the pi.

Re: 360 degree camera

Posted: Tue Jul 07, 2015 3:14 pm
by seregus
Hi,

Thank you for suggestion - I also thought about it, but to be honest it's kind of crutch, because it makes camera and rotation bulky and heavy...

Re: 360 degree camera

Posted: Tue Jul 07, 2015 3:18 pm
by experix
How about reciprocating motion rather than continuous rotation?

Re: 360 degree camera

Posted: Tue Jul 07, 2015 11:13 pm
by riataman
I have an inexpensive chinese IP camera that can rotate about 320 degrees, but the lens is so wide that it easily can have vision of the whole 360 degrees.

The camera pan and tilt can be controlled from the PI using simple http requests (using curl from a shell script for example) and video and stills can be grabbed using curl or ffmpeg (for video).

This is the one I have:
http://www.aliexpress.com/item/S6211Y-W ... 46888.html

But most of those Chinese clones are the 99% the same.

Re: 360 degree camera

Posted: Wed Jul 08, 2015 2:30 pm
by seregus
Hi all,

I actually found a solution, which seems will suit my need, so I'm posting it here - maybe someone will like it.
First you'll need to buy a special board to convert nicelly flat ribbon for Raspberry camera to a gpio output (yes).
I've found one here:
http://www.bitwizard.nl/cat/product_inf ... anguage=en

After all you need is a small Slip Ring with 16 cables, which I've found here:
http://www.servo-drive.com/rotary_slip_rings.php

This allows to put camera with small board on a 360 degree platform!

Thank you very much all!

Re: 360 degree camera

Posted: Wed Jul 08, 2015 4:43 pm
by Burngate
You're welcome to try, of course, but I'm not sure that slip-rings will be very reliable.
Those slip-rings you've linked to are specified as "Noise: < 100 mO at 6 Vcc and 50 mA (at 5 rpm)" but there's no spec. that I can see for frequency. The problem is that the signals from the camera are quite high speed and low level.