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Thread: Nook Color & power / ignition question

  1. #1
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    Nook Color & power / ignition question

    Please let me know if I need to move this to a different topic..

    I have a 2006 VW Jetta and I have only one hold up to finish my project. I bought an after-market wiring harness which has ground, constant, ignition and amp.

    I was under the impression that ignition would only deliver power when the ignition was on. I was wrong. Whether or not the ignition is on, the ignition wire is always hot.

    I found a product that will do what I need. It's here: http://www.connects2.co.uk/Instructions/Igni-Gen12V.pdf

    Unfortunately, I can't find a place that will sell it and ship it to the USA! I also don't know what exactly this thing is to search for an alternative.

    Does anyone know what I should be searching on, or if there is something else I should be doing when I try to bring power to my Nook Color when the ignition is on?

  2. #2
    Mod - iPad Forums RipplingHurst's Avatar
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    I just used a simple 12V automotive relay. You just need to find a real IGN wire and a constant power source wire, ground, plus one cig. lighter socket is all that I needed. Ign on, relay on, 12v switched on to the cig. lighter socket where the nook color power adapter goes.

    Using tasker app (android market), when the car is on, nook's car adapter gets power, turns on the screen. When ign is off, 12v is cut off by the relay and tasker shuts down the screen in 3 secs.

  3. #3
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    I've been doing a lot of research on this. It turns out, my car uses CANBUS to switch the radio on and off. So from the harness there is no accessory power that is ignition switched.

    I have two options. 1.) run a wire to a fuse that comes on with the ignition (don't want to do that), or 2.) buy this (which is more than I need but does what I want) http://www.pac-audio.com/PACProductD...ons_100709.pdf

    My estimate for this project was $300 - it's about to hit $500.

  4. #4
    Raw Wave
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    Most add their own supply - it's cleaner than any IGN-switched power, hence less noise or glitches for audio and PCs etc.

    That requires what RipplingHurst wrote...
    You add your own fuse and relay and power wire from the battery. (Some run the battery -ve as well, usually using fig-8 cable.)

    The relay is energised by the IGN or ACC or manual switch depending on what is required.
    Many will add diodes so that combinations can be used - eg, ACC and IGN (so that the relay remains on with ACC but doesn't drop out during cranking) - just connect both via a diode (IN4004 etc) to the relay coil (86).
    Add others via diodes for more control - eg, a manual-on switch, or other sources alarms, PCs, whatever.

    That's a few $dollars with easy to get spares (which most get up front) as opposed to a costly limited solution.


    PS - that Igni-Gen12V still requires a relay, so you are essentially buying a (say) $30 Igni-Gen12V plus a $0.20 diode instead of a few $0.20 diodes! Wow - what great product! (It is for the rich and famous.)

    FYI - I note in Igni-Gen12V.pdf that they break the relay convention of 86 to +ve & 85 to GND. That really impresses me (NOT!).
    Further, that they require YOU to fit and external protection diode (like a 20c IN4004) when the unit is intended for relays... That is superb! They obviously want to give buyers the maximum chance of blowing the Igni-Gen12V - especially if wired in accordance with their instructions using a relay with inbuilt diode!
    That protection should be part of the Igni-Gen12V!
    Not that I am one for simplicity & reliability, and cheap easy DIY solutions...
    Last edited by OldSpark; 09-15-2011 at 10:21 PM. Reason: ps...

  5. #5
    Newbie Longarms's Avatar
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    OldSpark (or someone else?) would you mind elaborating on how to power a tablet?

    If I want the tablet to be powered when the key is on, and also when the engine is started, I need to find two pre-existing wires in the truck? (One for acc on, and one for ign?)

    IGN---D>--\
    >---switched power tab on relay
    ACC---D>--/

    D> is supposed to be a diode, with direction
    Then of course the power from the relay goes to the tablet, and the ground to ground.

    I'm guessing the easiest way to plug the tablet in would be to get a cig-lighter to wall wart (12 to 120) adapter, and attach the power cord to the relay that way. Do I run that ground to the frame too?

    This is where my electrical knowledge gets a bit sketchy...

    If someone would be so kind as to help me out with a step-by step, or point me in the right direction, that would be fantastic!

  6. #6
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    OldSpark (or someone else?) would you mind elaborating on how to power a tablet?

    If I want the tablet to be powered when the key is on, and also when the engine is started, I need to find two pre-existing wires in the truck? (One for acc on, and one for ign?)

    IGN---D>--\
    >---switched power tab on relay
    ACC---D>--/

    D> is supposed to be a diode, with direction
    Then of course the power from the relay goes to the tablet, and the ground to ground.

    I'm guessing the easiest way to plug the tablet in would be to get a cig-lighter to wall wart (12 to 120) adapter, and attach the power cord to the relay that way. Do I run that ground to the frame too?

    This is where my electrical knowledge gets a bit sketchy...

    If someone would be so kind as to help me out with a step-by step, or point me in the right direction, that would be fantastic!
    you can find power supplies on here that will supply what you need or as you suggested use a cigarette lighter adapter as your power supply, you can tie into your accessory wire off your stereo harness or your power wire from your accessory power or cig lighter outlet, this will give you the key on/off functionality. all power should already be regulated 12v DC so you wouldn't need a diode unless you are wanting to use it for something else. also if you can find a tablet that auto boots on external power or a rom that is setup to do this it will save a lot of grief if your battery dies.

    2 issues i came across with my setup were while cranking alot of transient power causes the tablet to get confused if you have macro's setup to turn on cell radio's etc when it senses external power. also be careful of pulling too much load from one source, i have a bluetooth kit, deck and booster amp all pulling off my 12 acc for my stereo and it was causing my deck to shutdown if i cranked the volume too high. depending on how you work your setup it shouldn't be a problem though.

  7. #7
    Newbie Longarms's Avatar
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    Thanks for the reply! I actually found a semi-elegant solution. http://www.amazon.com/Roadpro-Batter..._bxgy_e_text_b this dohickey with some wire and an add a fuse is what I'm gonna try. Thanks for the tip on not over

    drawing from one source!
    Last edited by Longarms; 12-01-2011 at 08:07 PM.

  8. #8
    Newbie craigbru's Avatar
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    You might be overthinking it. The Nook draws very little power while powered on or charging. In fact, I have mine wired to a constant 12v source. As long as it's docked, it's able to be charged. I've not had any issues with battery drain, nor do I expect to. The tablet is always charged, and since it's plugged in overnight, it's able to sync all my media, Slacker cached content, and calender info while I sleep. This may or may not be feasible for you, but I thought I'd throw in out there.

  9. #9
    Constant Bitrate
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    Quote Originally Posted by craigbru View Post
    You might be overthinking it. The Nook draws very little power while powered on or charging. In fact, I have mine wired to a constant 12v source. As long as it's docked, it's able to be charged. I've not had any issues with battery drain, nor do I expect to. The tablet is always charged, and since it's plugged in overnight, it's able to sync all my media, Slacker cached content, and calender info while I sleep. This may or may not be feasible for you, but I thought I'd throw in out there.
    i might have to give that a try myself, my battery was dying over night before and initially i thought i was leaking power somewhere but my gel cell just gave out on me, what trigger did you use for turning the screen on and off if power was constant? i think i could use bluetooth connect with my obd2 or possibly wifi connect. i just wish it wasn't so damn cold outside or i'd be on it already.

    which reminds me, make sure you have good cooling if you live in a hot climate

  10. #10
    Newbie Longarms's Avatar
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    If I could set my soft key to toggle the screen on/off, maybe a constant 12v would be better. I'm pretty sure my tab stays in wifi range when parked in front of my house.

    If I can't toggle the screen with the soft key, I will have to use charging to toggle it, which means hooking it to acc.

    Off-question. I dono what a power spike is really (yeah, more power while the car is turning over..), but could it affect the tablet? Is there something that should be done to prevent blowing it up (in-line fuse), or am I just being paranoid and dumb?

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