polywhoreism
Posts: 3
Joined: Thu Aug 08, 2013 2:36 pm

Camera Module Multiplexer (Switcher)

Thu Aug 08, 2013 2:59 pm

Hey all, i was hoping to get some input/collab/help on my idea for a board to switch between camera modules. My core competency is software engineering and a lot of this electronics stuff is new to me. So bear with me please :D

The idea here is to create a board when a signal pin is low camera 1 is hooked to the CSI port, and when high camera 2 is hooked. Here is where i am at so far:

From the spec here:
http://www.google.com/url?q=http%3A%2F% ... npry8-qNsg

I see that the connections I have to worry about are the CSI specific CAM1D0 - CAM1CP and that seems easy enough to handle with a chip like this:
http://www.mouser.com/ProductDetail/Fai ... 252bj6c%3d

Apply 3.3v on that bad boy to switch the CSI lines, but there is still the matter of the I2C interface and the remaining CAM_GPIO, CAM_CLK and the 3.3v power (though my thinking is maybe i could leave power and GND running to both cameras if their idle current draw is low?)

Anyhow seems to me that an I2C switch is the way to go for the SDA and SCL lines, so maybe something like this?:
http://www.mouser.com/ProductDetail/NXP ... 9b9p4Co%3d

As for the CAM_GPIO, CAM_CLK (and maybe 3.3v power?) i am at a loss.. Would a simple DPDT switch be enough for those? Not really sure on their function.

And hardware aside i am aware that each camera will have to be torn down before the switch is made and the new one will need to be re-initialized. For my purposes this is fine, and I'd be happy to release my little C library that does this.

Whew that was long, hopefully some electronics gurus find this, thanks!

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RaTTuS
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Location: North West UK

Re: Camera Module Multiplexer (Switcher)

Thu Aug 08, 2013 3:07 pm

why?
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polywhoreism
Posts: 3
Joined: Thu Aug 08, 2013 2:36 pm

Re: Camera Module Multiplexer (Switcher)

Thu Aug 08, 2013 3:21 pm

Well admittedly some of it is the challenge/excitement of trying something new (or at least I haven't seen yet?) :D

But past that I have a need for a dual camera video set up where you usually look out the front camera but occasionally need to look out of a rear camera and the few seconds to switch between the two is acceptable. I could use 2 pis and switch the video input signal but I don't really want a second pi eating my battery, and to wait for it to power up each time i wanna switch cameras would suck.

wemcdonald
Posts: 1
Joined: Sat Nov 02, 2013 12:59 am

Re: Camera Module Multiplexer (Switcher)

Sat Nov 02, 2013 1:00 am

I have the exact same need, and had the same intention. Have you tried this yet?

MikeX
Posts: 2
Joined: Wed Sep 04, 2013 12:40 pm

Re: Camera Module Multiplexer (Switcher)

Wed Sep 10, 2014 8:58 am

Hello,

this new module would fit your needs ;)

https://www.indiegogo.com/projects/ivpo ... lexer#home

Sincerely!
Mike

iftakher
Posts: 1
Joined: Thu Feb 19, 2015 6:12 am

Re: Camera Module Multiplexer (Switcher)

Thu Feb 19, 2015 6:13 am

Hi, did u ever work on this ?

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seregus
Posts: 13
Joined: Wed Jul 18, 2012 1:29 pm
Contact: Website

Re: Camera Module Multiplexer (Switcher)

Wed May 20, 2015 1:57 pm

Actually the solution you looking for exists now! So funding campaign was successful and you can buy a fully functional module!
Simply use Ivmech:
http://www.ivmech.com/magaza/en/ivmech- ... lexer-p-90

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DougieLawson
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Location: Basingstoke, UK
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Re: Camera Module Multiplexer (Switcher)

Wed May 20, 2015 3:17 pm

Wow! That's an incredibly high price. £56 for that switcher board, £20 for each camera plus £30 for the RPI2B.
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