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Thread: CarPc Joycon Exd USB power?

  1. #1
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    CarPc Joycon Exd USB power?

    Does the Exd supply power on the USB port?

    I'm looking at driving my Android phone from the steering wheel control, via an Exd.

    But if the phone is connected to the Exd by USB, I can't power the phone.

    Does the Exd supply power on the USB port when the Exd has external power?

    If not, I guess I need a USB hub. Any recommendations?

  2. #2
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    it definitely wont power the phone, the phone will power the Joycon. The Joycon RECEIVES power via USB.
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    That's a shame - it makes using an Android phone with the Joycon pretty much a non-starter for me.

    I use my phone with Google Maps for navigation, and Play Music for sounds. To run Google Maps (drawing power for GPS and screen permanently on) requires permanent power in excess of the 500mA that a USB hub would provide.

    If the only way to connect the phone to the Joycon is via USB, then this clearly won't work as the phone won't be able to charge.

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    Quote Originally Posted by gooman View Post
    That's a shame - it makes using an Android phone with the Joycon pretty much a non-starter for me.

    I use my phone with Google Maps for navigation, and Play Music for sounds. To run Google Maps (drawing power for GPS and screen permanently on) requires permanent power in excess of the 500mA that a USB hub would provide.

    If the only way to connect the phone to the Joycon is via USB, then this clearly won't work as the phone won't be able to charge.
    Well it seems all you'd need is a self powered USB hub like this one to power the joycon and charge the phone at the same time.
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    Like any USB powered hub, it only provides 500mA.

    The phone needs at least 750mA when running GPS and permanently-on screen, otherwise the battery drains. It's not possible to have the phone connected to the Joycon via USB adn be properly powered at the same time.

    This is an HTC One X - my previous Samsung Galaxy S II was the same. I'd guess most smartphones will fall into the same trap.

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    You can actually get away with just connecting the D+ and D- wires to your phone, and get the 5V and ground from elsewhere and it will work. I would recommend at least connecting the ground too though.

    I have done all kinds of USB experiments, including running a 12 to 5 DC-DC converter to power my USB ODAC on the outer two red and black wires, then connecting the green and white only to the motherboard. It works just fine.

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    rray: You HAVE to share the ground some how. Otherwise you can cause damage to the equipment. Not sure how yours is working without sharing the ground...

    To power port just use the black and red wires...

    To send/receive data just use black, green and white wires...

    Not using the black wire can cause voltage differences that can damage your devices. Your's must be grounded through case grounds or something which is why they are working.. But still not a good idea.



    Rodney

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    This still isn't going to work for my application.

    For a phone to know that it can try to draw more than 500mA, the data pins have to shorted together on the phone side of the connection.

    So I can either have the phone able to draw enough power, or I can connect it to the Joycon - not both.

    Without a Bluetooth connection, its simply not going to be viable to connect an Android phone used for navigation to a Joycon Exd.

  9. #9
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    Mine does have the ground shared, because all the grounds in my car are shared. So the ODAC's converter ground is connected to the MOBO's converter's ground. I have both battery grounds paralleled, and all electronics grounded to those.

    In the case of the phone to Joycon, that is why I mentioned ground should probably be connected too, as it's always good practice to ground everything; but the +5V does not need to be connected to the phone, only to the Joycon.

    The point being he can power the Joycon from elsewhere and just use the phone's D+ and D- for the USB communication, and of course share a ground to the phone.

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    Quote Originally Posted by rray View Post
    Mine does have the ground shared, because all the grounds in my car are shared. So the ODAC's converter ground is connected to the MOBO's converter's ground. I have both battery grounds paralleled, and all electronics grounded to those.

    In the case of the phone to Joycon, that is why I mentioned ground should probably be connected too, as it's always good practice to ground everything; but the +5V does not need to be connected to the phone, only to the Joycon.

    The point being he can power the Joycon from elsewhere and just use the phone's D+ and D- for the USB communication, and of course share a ground to the phone.
    Yes... I am doing this in my Truck or will be. Already tested it on the bench and worked fine.
    Ground and data lines going to computer...
    Red and ground coming from a modified car charger I hard wired to the USB hub.

    Rodney

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