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Thread: New Product Idea Automotive USB Hub

  1. #41
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by 2k1Toaster View Post
    That's the maximum allowed. Not the maximum recommended, but to be USB certified it CANNOT supply more than 500mA per port. This is the best the USB standards allow for legally and safely considering the specifications regarding USB cables. (Seen those ribbon reels of USB/Cat5 cables? I think 500mA is even a stretch for some of them...)



    Not all hubs put out 500mA. That's the max they can. If you plug a passive hub into a USB port, it can supply 500mA maximum to all devices connected to it. It cannot tell the system "I am a 5 port hub, I need 2.5A so I can supply the rest of my ports with 500mA", so it is split. Split it again and so on and so on.

    Not sure if that's what you meant, but "maximum" really needs to be used.
    That is what I meant........ Thanx for clarifying.
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  2. #42
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    yep, I was meaning for daisy chaining.

  3. #43
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    85 dollars? That's crazy talk.
    $25 5volt PSU
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-016.htm

    $9.99 Usb hub with 5volt input
    http://www.newegg.com/Product/Produc...82E16815123007

    Done.

    You could go even cheaper with this and probably even better, if you just use any hub without a power input and then hack the usb cables up and hook their power directly into the hub.

    Even more cheap, you can make the regulator circuit yourself for 10 bucks and for 20 bucks you have a 12 volt powered usb hub.
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  4. #44
    Vendor - Qube colin's Avatar
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    Quote Originally Posted by PaulF View Post
    85 dollars? That's crazy talk.
    $25 5volt PSU
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-016.htm

    $9.99 Usb hub with 5volt input
    http://www.newegg.com/Product/Produc...82E16815123007

    Done.

    You could go even cheaper with this and probably even better, if you just use any hub without a power input and then hack the usb cables up and hook their power directly into the hub.

    Even more cheap, you can make the regulator circuit yourself for 10 bucks and for 20 bucks you have a 12 volt powered usb hub.
    Those USB hubs are about $1 on eBay. I bought two of those exact ones with the intentions of hacking it to use molex power and put the lit plastic pieces into the dash so they light blue when something is plugged in

  5. #45
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    LOL,

    I didnt know a 12V>5V PSU + a USB hub is a holy grail.

  6. #46
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    $85??!?
    for those who born yesterday lol.
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  7. #47
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    Yep, I already commented elsewhere that the asking price for the Carnetix unit is excessive. Something in the order of $50 would be a fair price, I would think. Comeon Mp3Car and Carnetix, ou know you can do better than this - or did you forget we're in the midst of a global financial crisis?

    You want to sell, you've got to do better than this.

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  8. #48
    Lok
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    Haha...so you want me to reverse engineer the product? I am not sure I can do that as I do have some ethics unlike my chinese counterparts. What I can do is see if I can make a better product with more functionality. I have a design that I worked on about a year ago with some engineers when the Co-Pilot project was going strong. We were working off a 7 port design from SMSC as we were aiming at providing 8 useable powered ports along with 6 internal ports for GPS, Bluetooth, Touch Screen etc with use of two hub chips. Maybe I can ask my engineer to isolate the hub from the rest of the base board design and run with that. At least then we are talking about at least 7 ports. I do agree that $85 is a bit on the expensive side, especially since all its doing is making our jobs a bit easier. Most of us already know how to get around the powered hub hurdle.

    Even at $50 it is still putting a dent in your wallet but I can understand the price point. The developer has to recoup costs, I am sure as simple as the design may be, the development costs are still in the thousands, I know from experinence. Also Carnetix isn't Belkin or Dlink, they simply don't have the volume to be able to sell it at a competitve point.

    Before getting to hasty I am going to wait and get one of these and I will let you guys know what I think of the device once I recieve it.

  9. #49
    Constant Bitrate mstaedt's Avatar
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    Quote Originally Posted by kenbam View Post
    Just out of curiousity, is there a problem with using the 5 volt rail from the PSU. Its regulated and turns off when ecu does, holds the 5 volts during standby mode and shuts off during hibernate and shutdown.
    That's what I did. I just cut off the connector for the 3.5" drive and ran the 5V wire to both my 4-port hub and also my USB CD-DVD drive. I haven't had my system installed very long, but I just got back from a 800 mile road trip with no problems.
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  10. #50
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    Surely a normal 7 port hub and a 5v charger will work fine... I've got a 5.5v USB charger for the cig lighter that I used to use to charge things like my phone, camera and tomtom satnav when I was travelling (means you only need 1 charger!) and that's rated to 2a... So I really cant see the issue lol, especially when most 7 port hubs are supplied with 2a 5v dc adapters.... That's what I'm gonna be using anyway, cost me about 2 ($1 ish) for the car adapter and a reasonable hub will probs set me back about 10 ($5 ish)... So for this to be a reasonable product it'd have to be cheap! lol

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