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Thread: W3bMa5t3r's USB Power Modules

  1. #11
    FLAC W3bMa5t3r's Avatar
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    I haven't done any measurements on this yet, but I've had the I455 phone running 24/7 off the 2 port no data module. I've gone out to the car after 24 hours and had no noticeable affect on the battery, and I have a big motor to turn over. I'll be checking battery voltage levels later today and for the next 1-2 days as I'm letting the car sit (I'll prolly change the oil on Tuesday though, so I'll be cranking her back up then (well hopefully )).

  2. #12
    FLAC W3bMa5t3r's Avatar
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    Ok, so the car has been sitting for 3 1/2 days with the cell phone running/charging off it. Just went out and checked the voltage on the car battery. It's sitting at 11.6vdc. So yeahhhh these modules are doing fine.

    I'm not sure if a GPS puck would use more or less power as I know cell phones can suck some serious juice(cell battery) when using the gps module and uploading data, but it seems so far, that it should do fine on daily/almost daily drivers.

  3. #13
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    my laptop is one of the few that leaves 5V powered on when its in suspend to ram.
    The battery isnt one of the most powerful ones ever, my laptop pulling 22-25 WHR from it, I get anywhere from 2-3 hours.
    as a test, I left the gps plugged in and running off the machine while the laptop was in suspend. (again, my laptop leaves USB powered up in suspend...)
    The gps remained locked on for about 2 days before the laptop battery was shot.
    They pull a noticeable amount of power, but I'd imagine a car battery has a heck of alot more go-juice than this laptop battery.
    64 WHR battery, unfortunately Its reporting 41% wear now...during the test it was less than 20.

  4. #14
    FLAC W3bMa5t3r's Avatar
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    @ netman86 - Good info Thanks

  5. #15
    Constant Bitrate gokee2's Avatar
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    Hey Steve,
    Here is my question: How are your great modules any different from say a regular USB Male to Female extension cable? I guess where I'm lost is that if you do connect say the data transfer module to your mobo USB and you run a USB powered HUB into your module you will have enough juice to power more than one "power" hungry device like an external DVD drive and say maybe an external HDD?

  6. #16
    FLAC W3bMa5t3r's Avatar
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    Well with USB standards giving each port a max of 500mA. For each device plugged into that port, you're dropping the available power.
    Code:
    [] - 500ma (1)
     L___[] - 500ma (2)
          L___[] - 500ma (3)
    That's how power is supplied. Now if I plug a device into hub 2 that pulls 200mA, it leaves 300mA for the other 2 ports, because port 1 can not (not supposed to) exceed 500mA. So if you plug into 3 that requires 400mA... something is going to be hurting.

    My module supplies(makes available) a total of 1500mA. Making it perfect for power hungry devices, even more than one . The other thing is my modules can be set to be always powered on, for items like cell phones, or gps pucks that you would like to keep on...

    Cheers

  7. #17
    pim
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    It would even be better if it would use the host's USB 5v to switch on and off, rather than the car's switched 12v.

    This way, your connected devices will still be connected if your car pc shuts down, usually after you turn off ignition. Disconnecting your devices before shutting down may cause havoc.

    Pim

  8. #18
    Constant Bitrate gokee2's Avatar
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    Nice, Very nice. Great Job You think I could pick up one of the data pass-thru modules at the next car meet?

    ps: check this link out http://www.aximsite.com/boards/x50-x...-must-see.html
    Can you make one of those Steve or teach me how to. LOL?

  9. #19
    FLAC W3bMa5t3r's Avatar
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    Quote Originally Posted by gokee2 View Post
    Nice, Very nice. Great Job You think I could pick up one of the data pass-thru modules at the next car meet?
    Thanks, and sure. I'll try to have a few of each w/ me.

    Quote Originally Posted by gokee2 View Post
    ps: check this link out http://www.aximsite.com/boards/x50-x...-must-see.html
    Can you make one of those Steve or teach me how to. LOL?
    Dang... I haven't had a chance to look over it much since I'm at work, but it looks pretty sweet

  10. #20
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by W3bMa5t3r View Post
    The modules supply 1.5mA of power, USB specs are 500mA per port, so this should do fine.
    Quote Originally Posted by W3bMa5t3r View Post
    Both modules will supply up to 1.5mA total. And yes, the specs for USB ports is 500mA per port. I swear I wrote that above
    Quote Originally Posted by W3bMa5t3r View Post
    My module supplies(makes available) a total of 1500mA.
    Perhaps you could clarify. 1.5mA (which seems unlikely, but you wrote it twice like that), or 1500mA? I doubted it the first time you wrote it, was just plain confused the second time, and the third time it seemed far more reasonable.
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

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