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Thread: Taking the plunge...

  1. #11
    Variable Bitrate
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    Quote Originally Posted by eugenweij View Post
    I will use the battery to create an always on scenario for my odroid board.
    I will use tasker to set the board to a minimal state as soon as tasker detects that my phone disconnects, wifi, gps etc will turn off , and android will be set to a minimal power using state.

    The screen will turn off and on with the ignition so thats taken care off as well.

    The benefit will be that when my phone connects to the odroid device I will have an instant on scenario, as soon as I get the hardware parts I will be testing how long the board can survive on a full battery in sleep mode.

    another reason is a power supply one, my current screen is connected to the iso connector of the original radio , with a simple module in between that makes 12V out of the 14.1 that comes out of the iso block.

    But the odroid needs 5V, and according to hardkernel it will be between 1A and 2A depending on connected peripherals , the battery has a 2.1A out and a 1A in.
    I have a usb charger that connects to the cigarette lighter, wich produces 1.1A at 5V , so I am hoping this setup will eliminate any need for a new (pricey) power supply.
    Just seems that with maybe a 3-4 amp current draw including the screen (although when the vehicle is powered off the screen would be off so then what 2amp?) It would take quite some time to actually drain the battery? Unless the car is going to be off for weeks at a time?

  2. #12
    Constant Bitrate eugenweij's Avatar
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    yeah it would take quite some time to drain the battery, 20000 mAh is a discharge of 20Ah , 20 amps per hour , so when the odroid board is on and taking the full 2A current draw it would take 10 hours to drain the battery.

    at least thats the calculations I found with google.

    and my screen is powered separately and turns off when the ignition is turned off.

    One step in the testing will be measuring how much milliamps the odroid needs when in sleep, then I will have a better understanding of the time that it would take to drain that battery.
    View my worklog here

  3. #13
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    Quote Originally Posted by eugenweij View Post
    yeah it would take quite some time to drain the battery, 20000 mAh is a discharge of 20Ah , 20 amps per hour , so when the odroid board is on and taking the full 2A current draw it would take 10 hours to drain the battery.

    at least thats the calculations I found with google.

    and my screen is powered separately and turns off when the ignition is turned off.

    One step in the testing will be measuring how much milliamps the odroid needs when in sleep, then I will have a better understanding of the time that it would take to drain that battery.

    Hmm I don't know if 10 hours sounds right, but maybe it is lol. The O-Droid doesn't use 12v either, it uses 5v or something. So it's not 2amps at 12v which might be what gave you that calculation. But I'm not sure either. I guess having the battery for backup isn't a bad idea. Realistically you could probably get the current draw down to under an amp when in idle.

  4. #14
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    Sorry for interrupting (because I have no info about the odroid boards), but I'll give you a reference:
    My set-up (a DN2800MT mobo + 6.4 LCD) draws at full power 35 wats, which means 3A. The LCD alone draws 0.7-0.9A. So only the mobo at full power takes 2.2A.
    What I'm trying to say - it couldn't be real that tiny thing to draw 2A. Yes, it powered by 5V 2A adapter, but that means that it draws at max 80% of that 2A - 1.6A. (When calculating the power source for a device the engineers allays add at lest 20% extra).

    p.s. I found this video:

    Keep in mind that the device shown in the video is measuring Wattage. Meaning even while booting up the odroid is consuming way less than 1A. Maybe it's time OldSpark to have a look to this threat ...
    Soooo you probably will be fine even with the car parked for 3-4 days, BUT if you want be 100% you'll start the car in the noxt morning, you could try one, or both routes:
    1. Dual battery setup. Like mine for example, but mine will be tuned soon, so wait to the end of the mouth to see the update. Hint: an arduino will control the PC; the monitor; the second battery; the power to all devices added by me; the reverse camera by the state of the alarm, the car voltage and the reverse gear I'm writing the sketch for the arduino right now.
    2. Paul's volvo S60 - he did many things in his car, one of them was allays connected to the internet RasPi. He was measuring the battery voltage and in case it drops under **.*V car starts by it's own so that the battery would charge. I red his threat more than a year ago, so you may read it now, to see in detail, as my memory may be making jokes with me, you know
    3. A combination of both. Dual battery + auto car start
    My worklog: VOLVO S80 CarPC

  5. #15
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    Well its 2 amps at 5 volts or 10 watts. Even 10 watts is likely high though especially for an idle situation. I'd be surprised if it weren't low single digits on the watts during idle. The Odroid XU would be even better though because in low power applications it changes over to the quad A7 cores which are much more energy efficient than the A9 and A15 cores.

  6. #16
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    Nothing good about a flat battery in the morning before work...i couldnt imagine running any carpc/udroid without at least a buffer battery.good insurance as things dont always go to plan..plus your average car battery is never ever the same again after a heavy discharge.

  7. #17
    Constant Bitrate eugenweij's Avatar
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    The 2A draw is maximal draw given by hardkernel, and it applies to a fully running odroid u3 and the max mount of peripherals connected , also drawing power from the board.

    So the actual draw in my specific setup will be lower, but for calculation purposes I am using all the max amounts given by the manufacturer, that way I will be less likely to run into problems.

    and yes , it draws 2A at 5V , the battery is also 5V with a 20000 mAh capacity.

    when I google around a bit I find that the closest board to the U3, being the U2, draws 600mAh on average usage, and I am planning on using a powered usb hub so peripherals are separately powered and turn off when I turn the ignition off.

    I calculated amps based on the video, 0.3 watts at 5V is 0.06 A also known as 60 mA , thats very low, sweet

    But I will have more answers and more facts about the board as soon as I get my hands on it and start running tests.
    Last edited by eugenweij; 02-09-2014 at 03:08 AM.
    View my worklog here

  8. #18
    Constant Bitrate eugenweij's Avatar
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    I acquired a nice list of apps, tasker, car home ultra (untill RR android is mature enough), sygic and torque

    time to start fiddling with them on my tablet until my toys arrive
    View my worklog here

  9. #19
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    Quote Originally Posted by eugenweij View Post
    I acquired a nice list of apps, tasker, car home ultra (untill RR android is mature enough), sygic and torque

    time to start fiddling with them on my tablet until my toys arrive
    Also take a look at MortPlayer for playing music files. UI is better than poweramp IMO.
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  10. #20
    Constant Bitrate eugenweij's Avatar
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    good idea, I saw it in the blog by sonicxtacy but havent looked into it yet
    View my worklog here

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