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Small Mobile Stick Computer

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t1mur
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(Last edited by t1mur; 16th January 2014 at 03:11 AM.)
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Battery Full Small Mobile Stick Computer

I'm looking for an Android Stick for mobile, battery driven operation.

Can this be done?

Graphics hardware is not strictly needed - so could be disabled to save energy.
 
DaPhinc
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You can use any TV-Stick and power it with a portable power bank like this one:
http://www.amazon.com/6000mAh-Portab...s=powerbank+5v
There are also ones that run with AA batteries if you prefer that. The only thing you have to keep in mind is that the output curren has to be appropriate. For single-core sticks, 1A will do, but for dual or quad core you should look for a power bank which outputs at least 2A.

But i don't really get why someone would need a battery powered tv stick. You need power for your TV, so why can't you use that for the Stick also?
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t1mur
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(Last edited by t1mur; 22nd December 2013 at 07:05 PM.)
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I don't need a screen for this. I want to disable the graphics chip (or even rip it out). How much power do you think does the typical GPU consume, compared to the CPU? (Or all everything else?)

If such an Android stick is getting hot, is it rather the CPU or the GPU?
 
DaPhinc
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These devices (and i think all other devices that run Android) are all based on SoCs (System on a chip). This means that CPU and GPU is the same chip, so sorry, no ripping out of the GPU .
Power consumption depends on the task that is performed by the chip, and so does the the heat generation.
 
t1mur
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There should be a difference in power consumption between a) not performing any graphics related tasks and b) putting the GPU, the video memory and the HDMI port all into suspend mode - similar to sending a smartphone into suspend mode, while keeping the CPU running.

How much power saving b) will amount to, I don't know. Will it be closer to 5%? Or closer to 30%?

The portable power bank you linked to above is a little big for my use case. I would prefer to use a smartphone battery to power, say, a single core device. Do you think this would be impossible?
 
DaPhinc
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Android HDMI sticks are USB powered, so they need 5V. If you have some knowledge about electonics you can use any battery you want. You just have to build a circuit that converts the voltage of the battery (smartphone batteries have 3.7V) to 5V.
The power consumption is very hard to estimate. I would say a single core with idling GPU will consume about 0.3 - 0.5 Ampere depending on the CPU load.
But if you want a small android device powered with a smartphone battery, why don't you use a smartphone? What's the advantage of a hdmi stick?
 
t1mur
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Quote:
Originally Posted by DaPhinc View Post
What's the advantage of a hdmi stick?
I do not need a screen. So this is an advantage. I hope to find a battery that fits hush with the board. I like to carry the device around in a pocket. In addition to suspending the graphic hardware, I will try to throttle down the CPU, in order to make it consume less energy.

Do you think I will be able to get the power consumption down to levels of an average smartphone? Or are there fundamental differences that make this impossible? In which case I would indeed need to look for a smartphone SOC based solution.
 
DaPhinc
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The SoCs in these sticks are also used in cheap smartphones, so the power consumption will be about the same. If you want to underclock you CPU you should look for a device that has custom kernels, because most stock kernels do not allow over- or underclocking.
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t1mur
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Quote:
Originally Posted by DaPhinc View Post
look for a device that has custom kernels
May I ask for HW suggestions, pls? ATM, I have no clear idea what would be the best hardware/vendor relative to my requirements.
Availability of custom kernels would be good. Availability of usable kernel sources would be even better. A big plus would be availability of 4.3.x - due to improvements in the Bluetooth stack, among other things. Any chance to run pure AOSP on any of these stick devices?
Thx.
 
DaPhinc
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I am quite sure that there is no device that meets all your requirements.
I know that there are custom kernels and even a (bad) cyanogen mod build for the mk808, but it is a dual-core, not a single core as you wanted.
And Android 4.3 is not available for any of these sticks. Maybe it will come as an update for the current generation of quad core sticks, or maybe not until the next generation (mid 2014) arrives.

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