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Thread: Keeping the Deluo GPS powered

  1. #1
    Constant Bitrate Vineet Singh's Avatar
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    Keeping the Deluo GPS powered

    Well, after debating to use a switched power line, or always on, I went with always on for now.

    It was pretty simple, if you don't want to cut up your deluo cable, get a PS/2 male/female extension cable and hack it up, this is what I did. You need to cut out the 5v supply on the male side, pin 2 (I'm using it though the USB port), and run a wire out of it.

    On that wire, you need about 66ohms to keep it at 4.5v @ 130ma (average seems to be 122ma).

    The Deluo/EverMore GM-305 can run off of 3.5v to 8v as tested, so even though this is a cheeseball method of getting the right voltage to it, it should be ok.

    I took 5 5% tolerance 330ohm resistors in parallel (ORANGE, ORANGE, BROWN, GOLD - 1/4watt each, 330ohm/5= 66), and got around 64ohms from the total. The total max draw is ~1.1w, so you have a 10-20% overhead, but it still gets a little warm. Just put it inline to the wire that is out of the extension cable, and it stays powered.

    Good to about 16v input max (7.5v to the unit at this point), and good down to about 12.1 volts from the battery when it is starting to drain. It automatically draws much less current (~20ma) if it can't turn on past ~3.4volts at this point, so in a way, it's a ghetto battery saving mode.

    I drew up a schematic that might help you, but test for yourself as to which pin to really mess with (male end, pin 2, going to the GPS). All this information is to be used at your own risk. I'm not liable for you burning out your GPS, or applying voltage to the wrong side of the circuit and blowing your USB hub or PC. Also, I'm not responsible for giving you a jumpstart when you find your battery dead after a week of sitting

    To stop the current draw if you leave the car parked for a while, you can simply disconnect the USB from the PC, and that will leave it ungrounded. I suggest a 1amp or smaller fuse on the supply side.
    Attached Images Attached Images  

    91 Stealth RT/TT
    CarPuter: Inspiron 5150 P4 3.0ghz; Built-in WiFi; Deluo GPS; Radio Shark; OBD1; Nostromo Speedpad
    Audio: Audigy 2 NX; Clarion 500.5 amp; 100.2 center channel amp; Kicker Solo-baric L7 10" Sub
    Display: Lilliput 7" Touchscreen

  2. #2
    Constant Bitrate Vineet Singh's Avatar
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    Jul 2003
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    Naperville IL
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    Quote Originally Posted by Vineet Singh
    Well, after debating to use a switched power line, or always on, I went with always on for now.

    It was pretty simple, ...

    To stop the current draw if you leave the car parked for a while, you can simply disconnect the USB from the PC, and that will leave it ungrounded. I suggest a 1amp or smaller fuse on the supply side.

    After 12 hours, the battery voltage went from 12.75 to 12.39, with just the cars ECU and the USB GPS running. I'll keep you all posted. I have 2 20ah gel cells in parallel to power the car and the carputer (so I think I'll get 35ah out of the deal). As a side note, the carputer takes up 3amps of power to run, including the 2 amplifiers, laptop charger, relay, and 5v powersupply (supplying 1.2amps by itself to the powerhungry audigynx, but with no sound output).

    91 Stealth RT/TT
    CarPuter: Inspiron 5150 P4 3.0ghz; Built-in WiFi; Deluo GPS; Radio Shark; OBD1; Nostromo Speedpad
    Audio: Audigy 2 NX; Clarion 500.5 amp; 100.2 center channel amp; Kicker Solo-baric L7 10" Sub
    Display: Lilliput 7" Touchscreen

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