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  1. #11
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    Quote Originally Posted by carputer View Post
    Would connecting a OTG cable be sufficient or the same as soldering in a resistor? That would put the device in a different mode (host or device).
    A standard USB Mini B normally only has 4 wires connected (+5V, 0V/Gnd, and 2 x Data Wires). The Nuvi has a 5th Pin (Pin 5 or Pin 'X') which it uses to sense what type of Cable is connected, and controls the charging current.

    Inside the Nuvi there will be a resistor connected to the +5V rail and the other end connected to the ID Sensor and Pin 5 (or pin 'X' as it otherwise referred to as).
    External to the Nuvi this wire (white) will connect to a Resistor of about 18K ohm in value, and the other end of the resistor to Gnd/Ov.

    These 2 resistance values (1 internal, the other external, via the cable), for a 'potential divider' such that changing the resitance of the externalk Resistor, changes the voltage to the ID Sensor pin inside the Garmin Nuvi.


    As stated the Garmin Nuvi USB Mini B socket has a Cable ID circuit n Pin 5 (or Pin 'X').
    There will no doubt be an internal resistor from the +5V rail to that ID Pin on the Min B USB, and external Resistor (18k Ohm) to Ground (Ov) completes the poential divider and the Voltage on that Cable ID Detect

    I learned of this website from a Arvin on RoadGui9de.ph:-
    [Only registered and activated users can see links. ] as has been quated here.

    Here is my reply to that pinouts.ru website:-


    [Only registered and activated users can see links. ]

    Because I was using a Garmin Nuvi 255 in a wether resistant handlebar mount case, on my motorcycle, powered from a 12V Power outlet (marine version CIGAR LIGHTER SOCKET with waterproof cap), I did not want to use a standard USB A to USB- Mini B, as this causes it to go into Data Mode, then after 20 seconds it will finally go into GPS Navigation mode.

    Sure the Garmin 12V PSU worked OK (but it sticks out rather far, and was prone to vibrating loose and power lost to Nuvi and I would have to push it back down to re-seat it, before the 15 sec count down to Power-Off.

    I have since found I can tip the 12V Socket into a more vertical position, so less of a problem.

    Regardless. running the Garmin Nuvi off a Dual USB Charger and a custom Cable with 90 Degree USB Min B (having 5P, with 18K resistor off that Pin5 (or Pin 'X'), gets it detected as a PSU Cable, is a cheaper alternative to buying a genuine Garmin 12V Charger (US$25 typically)

    Some USB Mini B 5 have a 200K Ohm resistor to ground already fitted. I soldered a 20K Ohm in parallel to get a Garmin Nuvi accptable value to detect as Power Cable.

    CDR King have low cost USB 12V Chargers:-

    [Only registered and activated users can see links. ]
    17168 4
    USB Car Charger Adapter(Dual Power Output)
    Php 100.00
    [Only registered and activated users can see links. ]
    15254 3
    USB CAR Charger Adapter (Dual Power Output)
    Php 150.00
    New Arrival
    USB1 - 2.1A
    USB2 - 1.0A

    Seems CDR King have a new (cheaper) white version of that SBC-10 2000mAh Battery /Solar Charger

    [Only registered and activated users can see links. ]
    15664 3 15664 4
    2000mAh Solar Charger
    Php 480.00 (Php100 less than the SBC-10)
    New Arrival

    Can be charged on the Sun Or PC/Laptop
    Polished case and LED power meter
    Suitable for mobile phones, iPhone, iPad, Camera, MP3/MP4, PDZ, NDS, PSP and other gadgets
    LED torchlight and charging indicator

    Specifications:

    Solar panel: 0.55W
    Built-in Li-on rechargeable battery (3.7V/2000mAh)
    Light distance: 3 meters
    Charging times:
    Sunlight: 9 ~10hrs
    PC/Laptop: 3 ~4hrs
    Mobile phone: 1 ~2hrs
    Size: 100mm x 60mm x 15mm
    3pcs. mobile connectors

    Package Contents:

    1 x Solar Charge (2000mAh)
    3 x Mobile connectors
    1 x Mobile connector cable
    1 x Manual


    Can be charged on the Sun Or PC/Laptop
    Polished case and LED power meter
    Suitable for mobile phones, iPhone, iPad, Camera, MP3/MP4, PDZ, NDS, PSP and other gadgets
    LED torchlight and charging indicator

    Specifications:


    Solar panel: 0.55W
    Built-in Li-on rechargeable battery (3.7V/2000mAh)
    Light distance: 3 meters
    Charging times:
    Sunlight: 9 ~10hrs
    PC/Laptop: 3 ~4hrs
    Mobile phone: 1 ~2hrs
    Size: 100mm x 60mm x 15mm
    3pcs. mobile connectors

    Package Contents:


    1 x Solar Charge (2000mAh)
    3 x Mobile connectors
    1 x Mobile connector cable
    1 x Manual

    It seems to have all the features of the SBC-10 (unless I am missing something?), but is white color and Php100 less!

    It still comes with the multi-Tip Connectors also
    15664 6

    It is fairly easy to add a 20k Ohm Resistor in parallel with the 200K Ohm one fitted inside the USB Mini B 'Tip'.
    I also cut the plastic case at 45 Degree and inverted one half amd using superglu to join them into 90 Degree Connector
    (Filling with Epoxy resin/car body filler to make it stronger if required, once confirmed working).

    The only problem is the DC Plug Lead of the Multi-Tip is rather short!

    Most USB - DC Power cables are to a DC Plug not socket!

    So how about this, as a possible 'fix' to that problem - solder a USB cable of the required length, in place of the solders DC Power 'protrusion'!

    For those not so good at DIY and soldering, and want to buy something costing less than a genuine Garmin 12V PSU check this out on eBAY:-

    [Only registered and activated users can see links. ]
    US $9.75
    $T2eC16V,%21wsE9suw%29qWDBQgkbq4egw%7E%7E60 12
    For those with motorcycles, perhaps ands not having a 12V Power Outlet (Cigar Lighter Socket) there is this alternative to genuine Garmin wired supply:-

    [Only registered and activated users can see links. ]
    US $15.50
    $%28KGrHqNHJEQFDjwVMzBBBRizotq8rg%7E%7E60 12

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  3. #12
    Member putipu's Avatar
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    How to build a service cable?

  4. #13
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    Pin 4 is X not 5.

    Pin 1 = +5V ( 5 volts DC )

    Pin 2 = data

    pin 3 = data

    pin 4 = GND ( empty not connected )

    pin 5 = GND ( ground )

    Look here:

    [Only registered and activated users can see links. ]
    If you wish, you can [Only registered and activated users can see links. ]

  5. #14
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    dasilvarsa's Avatar
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    Guide

    To make a simple usb charging cable just do this. (No Resistor Needed)
    (You can use your nuvi while charging.)
    After this mod your cable cannot be used for usb access ever again so make sure it's a spare cable.

    Tut:
    Take a spare nuvi usb cable.
    Somewhere in the middle of the cable carefully cut open the insulation using a sharp Stanley knife or razor blade (Be Careful not to cut open your fingers.)
    Cut the 2 data lines (2 colored wires, usually white and green ) Do not cut the RED or Black wires.(Power)
    Now Insulate the cut wires on both sides using some shrink tube.
    Tape up the cable neatly.

    On Nuvi 1xxx the Nuvi will boot into Mass Storage mode for a short while and then boot again to where to screen.
    On 3490 the Nuvi will work normally.
    The difference between stupidity and genius is that genius has its limits.
    Albert Einstein.

  6. #15
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    @putipu

    You must first buy something like this:

    [Only registered and activated users can see links. ]

    Then solder 50khom resistor in pin 4+5
    If you wish, you can [Only registered and activated users can see links. ]

  7. #16
    Member putipu's Avatar
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    Will nuvi go in data mode with this cable?

  8. #17
    Member frantishek's Avatar
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    Quote Originally Posted by dasilvarsa View Post
    To make a simple usb charging cable just do this. (No Resistor Needed)
    (You can use your nuvi while charging.)
    After this mod your cable cannot be used for usb access ever again so make sure it's a spare cable.

    Tut:
    Take a spare nuvi usb cable.
    Somewhere in the middle of the cable carefully cut open the insulation using a sharp Stanley knife or razor blade (Be Careful not to cut open your fingers.)
    Cut the 2 data lines (2 colored wires, usually white and green ) Do not cut the RED or Black wires.(Power)
    Now Insulate the cut wires on both sides using some shrink tube.
    Tape up the cable neatly.

    On Nuvi 1xxx the Nuvi will boot into Mass Storage mode for a short while and then boot again to where to screen.
    On 3490 the Nuvi will work normally.

    Not work with Nuvi 2595! I have cable like this. I made it for my Dakota 20 and work without a problem with. I hope it's work with my new Nuvi 2595 but I was disappointed.
    Last edited by frantishek; 29th August 2013 at 17:24.

  9. #18
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    Does anyone know if it works with an Oregon? I would like to make a long USB cable which I could connect it to an USB-Car-Charger

  10. #19
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    new

    Quote Originally Posted by Intrepid51 View Post
    For those that are interested in avoiding your Garmin Nuvi going into PC mode when plugged into a U.S.B +5 volt power supply


    U.S.B connector pinout

    1 +5V 5 volts DC
    2 data not connected / float
    3 data not connected / float
    X GND connected to pin 4 (GND) with 17.3K ohm resistor
    4 GND ground

    Intrepid51

    Intrepid51

    FOR ALL USERS:

    Please also read a more detailed analysis with 6 solutions here:

    [Only registered and activated users can see links. ]
    Last edited by georgev; 28th July 2016 at 08:31.

  11. #20
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    Default USB Power for NUVI 2689LMT

    I have a Garmin NUVI 2689LMT and I discovered how to power it while viewing MAP info. from a standard USB charger. After trying all of the Pin 4 solutions in prior discussions (none of which providing a solution for the 2689), I purchased two Mini USB breakout boards. With these I found that Data Pins 2 and 3 from the Garmin 12-volt accessory charger are connected together and Pin 4 is left open. I then assembled the two boards with mini USB cables, as shown below:
    [Only registered and activated users can see links. ]

    I tried this fix using an in-car USB and a household plug-in USB and all seems to work perfectly; however, traffic data will not be supported.
    Also, I'd suggest NOT plugging the mini USB end into a computer, as the shorted D+ and D- pins may cause undesirable results!

    In my case and since I don't care about traffic data, I'm using it ONLY for in-car use to eliminate the bulky 12-volt adapter. This also frees up the 12-volt socket for my rearview camera monitor.
    Last edited by Skymaps; 20th August 2016 at 22:25.

 

 
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