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Charging Toshiba Encore Tablet while connected


Bushie
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Hi,

I have set up an 8" Toshiba tablet in my car as a dashboard. It is connected to my Link Storm Black ECU using a micro usb on the go cable. The cable from the Link ECU is plugged into a USB female socket on the OTG cable and then the micro USB connects to my tablet. Unfortunately when I connect the other USB male connector on the OTG cable to a usb socket wired into my cigarette lighter the tablet does not get charged. This means my dash conks out during a day at the track :)

To get the tablet charging I want to splice a USB cable to provide power to the tablet per these instructions:

http://forum.tabletpcreview.com/threads/charging-encore-whilst-using-usb-devices.60229/page-3

Is there a tidier way of doing this and is there any danger from backfeeding 5v of power into the link ECU down the USB cable? If so how can I work around this?

Are there any plans to make the Link ECU charge a connected tablet in the future?

.......
1. Cut up a standard micro USB to USB A cable (make sure this is a data cable not just a charge cable as can be supplied with some phones). DO NOT use an OTG cable for the micro USB connector end.
2. Cut up a male USB A to female USB A extension cable (I used one supplied with a 3G cellular dongle that I never needed)
3. Splice the power (red and black) and data (green and white) lines together between the female USB A and micro USB
4. Splice the power lines ONLY from the USB A to the other two spliced power lines.
5. You should have 3 black and 3 red wires all together, 2 green and two white wires together.

That's it....A simple Y-connector.
Despite all of the over thinking, boot up timing, switches, resistors etc that I have read about elsewhere, simply plug this combination into your Encore tablet and it works. I plugged an UNPOWERED USB 2.0 hub into the female, the male USB A goes to the existing Toshiba power brick/adaptor and the micro USB into the tablet........
Edited by Bushie
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No worries with power hurting the ECU as it would be no different to it being connect to a PC with power on the USB port.

No planed changes to the USB of the ECU as this would require hardware changes across the whole range.

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Try something like this:  https://www.amazon.co.uk/DELL-Micro-Dongle-Charging-Adapter/dp/B00NY2IJG8  I cant say for sure if it will work with your toshiba, but it does work on my generic no brand junk tablet. 

Thanks for this Adam.

How have you set this up? Did you plug the Link ECU tuning cable into the USB socket, the micro USB cable into the tablet and run a power brick or cigarette lighter charger into the micro USB socket?

i might give it a go

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How have you set this up? Did you plug the Link ECU tuning cable into the USB socket, the micro USB cable into the tablet and run a power brick or cigarette lighter charger into the micro USB socket?

Yes, thats how it would be connected.  I'm not normally using mine with a ECU though, more as a portable PC but I did try it with PC link before posting that and it worked ok. 

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  • 3 weeks later...

So I balked at paying $70-100 for a Dell USB dongle that might not work and went ahead with the DIY cable. I cut up a USB extension and spliced the female end into a micro USB cable. Then I spliced the power feed from a regular USB cable into that.

It's really hard to strip and solder wires that size. It took several attempts, but I can now display a dashboard while charging the tablet :)

Just thought I'd loop back so the knowledge can be captured.

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