yashsingh1/xdaforums huggingface dataset:
[Nexus 7 General] hoosbude:
Not wired to anything and totally fake, I could do a more convincing fake with photoshop
[Nexus 7 General] slick_rick:
I hope you were being sarcastic...
[Nexus 7 General] gerbick:
The possibility of this happening, even somebody attempting it, made my entire day. Awesome and luck guys.
[Nexus 7 General] angellsl:
Oh my. A surprising thread
[Nexus 7 General] mgori:
Please go troll somewhere else...BYE!
[Nexus 7 General] TheBigJ:
3.3V should actually be enough to power an SDCard. I use a microSD in a data logger with an Arduino and this setup is just working fine.

It would be interesting to see if a normal microSD to SDCard adapter is small enough to fit the space, as it's a really cheap way to interface these little cards.

Might want to check these two websites:

http://elasticsheep.com/2010/04/teensy2-usb-mass-storage-with-an-sd-card/

http://www.frank-zhao.com/cache/fat_sd.php

If we can find 4 free IO pins and a nice Kernel dev, there might be a chance to get it working.

Edit: I think this explains it quite good:
[Nexus 7 General] mvmacd:
wow, if this is possible that's awesome!

I am constantly fighting for storage as I use my N7 to watch videos and also have large games [MC3, N.O.V.A. 3] installed so that I almost always have < 1GB free.

How hard will the mod actually be? And where does the microsd slot actually connect to the tablet? isn't it all SMT, which I hear is extremely hard to hack?
[Nexus 7 General] hoosbude:
I don't consider this trolling, its stating a fact. Without proof you can only act on the evidence given. It looks fake
[Nexus 7 General] mvmacd:
You are innocent until proven guilty.

Give him the benefit of the doubt, and wait till he releases the full details before you write him off as photoshopping a hardware mod.
[Nexus 7 General] demkantor:
Seriously this isn't the type of thing to troll someone about, and yes it is trolling. There is no proof, I get it, but as of now there is an attempt being made and comments like yours will only stifle development/mods for this. There is no part of the op that is looking to show off or ask for donations or anything to suggest foul motives. If only he is showing where he is so far, looking for help and searching for other overlooked options than let this be. If its fake troll when that is showed, have fun with it. Until it someone is proved to speaking out of their ass leave them alone or you will not reap any benefit from this thread then leaving a stupid comment. Wow good for you and all your help to the xda community, thanks, seriously, thanks, its the only one you'll ever get here
[Nexus 7 General] enohand:
running test & probing the board & having a temp 2gb card, plus a card reader connected on my bread board tyring to get this thing to work properly means its fake?

how so...

why would i post pics of it all connected to the bread baords since that is only for testing,...i rather show a pic of what it WILL look like once im finished...

so go troll somwhere else
[Nexus 7 General] vegandroid:
dont even let these people bother you. you are making a huge breakthrough with this device if you get it up and running properly. im very interested in this thread, like others, and would love to see the making of this. keep posting and keep chugging through. hopefully youll post a tutorial once you get it done.
[Nexus 7 General] TheBigJ:
Are actually any Kernel Devs reading this topic and could indicate how difficult it would be to write an sdcard driver and let the OS access it? As this mod would not use the OTG capabilities which will also allow the Nexus to be charged while accessing the sdcard.
[Nexus 7 General] kmel6969:
Also you can use any usb flash drive but as you know, microsd class 10 cards are much faster & this new mini card reader is also a flash drive with the card in it. The beauty is you can use more than one card so your storage is endless.

After install "stickmount", once attached, go to any file manager, tap usb storage, then sda1 & all of your files, videos, music, anything you want. Install adobe pdf reader & quick office & view & edit office documents in word, excel, powerpoint & pdf.
[Nexus 7 General] AZKJS:
Wish I had the Testicular Fortitude to attempt a mod like this.

For now Im sticking with the OTG for anything I cant live without on the tablet.

I am really good at soldering.

Ive been making burning lasers and other small electronics for years most are heat sensitive and I rarely fail.

I just cant bring myself to pop the back off my nexus7...

Good luck man I hope you figure it out cause when you do I am going to pop this cherry!:cool:
[Nexus 7 General] Moricon:
Yes. Read a few pages back. The dev for the AWESOME EOS roms has offered his help once the hw side is done.
[Nexus 7 General] wildcolor:
Wow, wow, wow, wow. hope you can make that thing working
[Nexus 7 General] bobjbain:
Hmmm, I'm wondering, is it possible to make a powered USB cable that will charge the device whilst attaching a USB OTG device?

Am I correct in thinking that, in layman's terms, the power uses 2 lines and the data is down the other 2 (on the USB cable).

Therefore the power could be going one way (into the device) and the data the other way (well both ways IYKWIM!!)

Sorry, but that is a bit of a fallacy, Class 10 SD Cards are superbly fast at sequential reading and writing, they were designed specifically with multimedia devices in mind.

The best cards for random read/write (as required by any smart phone) is a class 6 card!! There was a big topic about this on the HD2 forums a year or so ago so if you search on there you'll find the threads and benchmarks...
[Nexus 7 General] t_007_v2:
We are impatiently being patient (;

How is it going?

Hopefully Google has figured it out that we will pay more for a Nexus tablet with all the bells and whistles made by someone other than Asus next time around.
[Nexus 7 General] iAppleDev:
Hey does anyone knows were I could hook 5V+ so I can finish this up?
[Nexus 7 General] DarkPyroGuy 09:
This looks really promising, I have been wanting to purchase a N7 since the release. This would make the buy that much better.

Sent from my CM10 Apple eating Samsung SG3
[Nexus 7 General] Munk0:
Could you temporarily grab 5v from an external source just to see if it works properly? Otherwise you might need to run a limiter of some type to bring down a higher voltage or use a dc to dc chip to upscale and get the needed 5 volts. I know nothing if there is 5v somewhere on the board and wish i could be of help.
[Nexus 7 General] ED2O9:
I've been working on this in my limited free time, but I'm experiencing some weirdness with my card reader. I've ordered a new one which should be here tomorrow. I can only speak for myself, but please keep in mind that I'm being more than a little careful in making this mod since I'm not too eager to damage my Nexus. Right now, my only problem is getting the tablet to charge while the OTG cable is plugged in. I'm trying to get it to work externally with the smallest components possible, then fit it inside the case once I've found a set-up that works.
[Nexus 7 General] morfic:
Is there 5V around the usb?

The Seven powers my usb DAC just fine.
[Nexus 7 General] NickS VR4:
Was thinking the same thing. Grab power but not data connection from there and it may be able to work. Just hope it is capable of more than 500ma draw if you have a secondary otg device.
[Nexus 7 General] nst6563:
There is only 5v on that micro-usb when it's plugged in to either charge or OTG cable. If it's not plugged in, I wasn't able to read any voltage off it.

It's possible as mentioned to do a dc-dc stup up or even a summing circuit by adding the 3.7v and 1.7v lines together (with the obvious resistors to bring down the over-voltage).

I think the charging part may reside in kernel support.
[Nexus 7 General] bpye:
Right then, I am no electronic engineer but I do have experience with such things. SD cards themself do not require 5v, only 3.3v, I am guessing that you are using the USB data for an SD reader and thus "need" the 5v. If so, then the SD card reader itself will have a voltage regulator somewhere as it will run on 3.3v, USB data is also 3.3v. Because of this if you can bypass that voltage regulator and supply power straight to the reader's 3.3v rail, then you should be sorted. 3.7v should be close enough. If you're not using a USB SD card reader please say so, I might still be able to help.
[Nexus 7 General] morbidpete:
If that tiny DC-DC amp will work, I'm more then willing to buy it and have it shipped to you just to get a final result on this!

e-mail me @ pete@plasstech.it if your interested
[Nexus 7 General] morbidpete:
Parts on order, Once I receive them I will ship to the OP, No int. Shipping :( This will take some time people, But don't stop probing for a steady 5v source
[Nexus 7 General] Erikbronx:
Looking good buddy! G20!!!!!:good:
[Nexus 7 General] Gainn:
I'll never understand why they didnt just add SD support in the first place, so good luck with this project.
[Nexus 7 General] mtxx1:
cause they want you to use google drive. promote their cloud storage, and if you run out of space, they hope you buy more cloud storage.

google is a company after all, and they hope to earn money
[Nexus 7 General] NickS VR4:
Probably preaching to the choir, but the problem is with only WiFi and no data connection, reaching that data becomes a chore.
[Nexus 7 General] Shano56:
And the fact that you can't run apps (HD games that are 1-2GB each especially ) from Google drive. This is where they screwed up big imo.

Why do they give us this beautiful device with a fast processor and lots of ram, then limit us to 16 (really 14) gbs of storage for games and other apps!
[Nexus 7 General] darckengel:
Wifi tethering from your phone,

You don't need 3G on tablets except if you want to feed even more your phone provider..
[Nexus 7 General] kendong2:
failing to see that some of us wouldn't care for a few extra bucks, or can even get multisims without an additional fee. but thanks for your contribution, you can be proud of yourself.
[Nexus 7 General] heyitsaustin123:
I think you could easily acheive this with a magnet glued to your usb cable, a reed switch and some transistors to switch the sense pin and the V+ pin. This way the sd card can get +5v from the usb when it's providing +5v in otg mode. The magnet would trip the reed switch and in turn the transistors. I'd be willing to help but I'm no electrical engineer. A great resource to check out would be the Adafruit forums. Good Luck! :fingers-crossed:
[Nexus 7 General] iAppleDev:
Was just thinking of that.

If you run a reed/switch to the ID pin over to the USB MicroSD reader, then when the the card is in OTG (ID pin grounded) and then when card is out OTG is off (ID pin not grounded).just need to come up with custom switch at card reader.
[Nexus 7 General] nst6563:
I've found some very tiny reed switches inside cdrw/dvdrw drives of all types (took them apart for the lasers). Not sure if they'd be small enough...but one of them was about he size of a micro switch so they were indeed very tiny. Used in the drives to detect disc in, tray travel, etc.
[Nexus 7 General] morbidpete:
DC-DC boost came in today, Heading to the post office now to ship out to the OP/Dev

these things are tiny!

Will arrive at your place in 3-5 business days
[Nexus 7 General] enohand:
Sorry I have been busy welding my intercooler piping together for my p10 and putting my car back together I haven't spent much time on this mod.

Also to the guy right above me.... I never gave you a address how are you shipping me a up volter?
[Nexus 7 General] alfeuss:
Lol good point.
[Nexus 7 General] Sharpen3d:
Aaaand this thread takes a turn for the weird.
[Nexus 7 General] morbidpete:
YGPM

---------- Post added at 12:36 PM ---------- Previous post was at 12:35 PM ----------

Lol, Not a big deal, iappledev is working on this also, So I sent one to him. I ordered a couple. So no worries
[Nexus 7 General] iAppleDev:
Sorry for the confusion I'm not the OP of this topic and I was asked if I could use DC board for testing.

Back on to the topic. I added a internal OTG switch to Nexus 7 it works great, next is to wire card reader/HUB.
[Nexus 7 General] nst6563:
looks good!
[Nexus 7 General] littleguy77:
Mighty fine soldering iAppleDev! Very cool integration of a switch. So which USB lines did you end up connecting to the switch?

Edit: Nevermind, looks like the switch connects/disconnects ID from ground.
[Nexus 7 General] gokart2:
Very interesting.....nice job too. Watching closely!!!
[Nexus 7 General] tommykwan222:
how can I buy this sd card reader for my nexus 7

I really want it
[Nexus 7 General] Logic_:
DROOOOOOOOOOLS

You Sir, are pretty awesome.
[Nexus 7 General] alfeuss:
Quick Question

Just a question about this mod. Will the tablet charge with the OTG switch on? I dont think it will, but I thought I'd ask.
[Nexus 7 General] Zeros:
I believe that is the point of the switch, one side for charging, the other to use UBS OTG.
[Nexus 7 General] kazekik:
can you make a tutorial video about open N7 :D
[Nexus 7 General] iAppleDev:
Yes and no, it charges if you plug charger in then switch on the OTG and it also charges when power is off with switch on or off but that's without the data lines and power. I'll update when I finish hook in mine up.
[Nexus 7 General] jarayn:
I'm pretty sure if you need a video to open it you can't do a mod like this.

I'm not trying to be rude, there's no chance of me doing this either bit opening it is a different story.

Use a guitar pick to pry it apart and then a credit card to work your way around the edges. It just pops off.

Don't just take it off for no reason though, you can damage the plastic clips and then it won't sit quite right anymore.
[Nexus 7 General] aalupatti:
http://www.youtube.com/watch?v=GoDAg8mYYz4
[Nexus 7 General] kazekik:
thanks
[Nexus 7 General] iAppleDev:
So I soldered in a switch to id pin and ground pin of micro usb all was good, charged when powered on and switch off, charged when power was off switch on or off. Now I soldered microsd card reader power and data lines to the microUSB connector them ran the ground for card reader up to switch, it works fine for mounting sdcard, but it won't charge when N7 is booted up. It does charge still when not booted up. Maybe I should have ran the ground for the card reader to microUSB port too. But at least it works and is all internal.
[Nexus 7 General] armyboy11b:
Dam ..I want this lol...I'm not skilled enough tho :p
[Nexus 7 General] dislplin01:
looks like you just opened your nexux and laid a micro sd on top of it
[Nexus 7 General] Milamber33:
If you read the thread, this is still a work in progress. Pics in the OP were one idea of placement, it's not wired in.
[Nexus 7 General] alfeuss:
Just a note about that youtube video. The guy points out a hole in the side and calls it access to a reset button. It is not a reset button. Its for the second microphone for noise cancelling. So dont go poking around in there.
[Nexus 7 General] ED2O9:
This sounds very similar to the issue they ran into trying to charge through the pogo pins:

http://xdaforums.com/showthread.php?t=1800099

It would only charge when the tablet was powered down. Be very careful, since one of the guys there ended up with a tablet that wouldn't charge through the USB port, and appeared to have damaged the circuitry.
[Nexus 7 General] ED2O9:
Have you guys followed this thread?:

http://xdaforums.com/showthread.php?t=1823377

According to the OP, the data pins are shorted on the Nexus charger and the tablet will charge regardless of whether or not the charge indicator is showing. Interesting...
[Nexus 7 General] nst6563:
It also looks like it will still charge if the data pins are not shorted (it just won't show as charging)....interesting indeed.
[Nexus 7 General] slimsuse:
If this works, I am all over it.
[Nexus 7 General] mrclnsf:
Wow!

Wow I'm interested! thanks guys for do that will work! [In a near future!] :victory:

Subscribed to the Thread.
[Nexus 7 General] nst6563:
http://dl.dropbox.com/u/47767898/me370t.pdf

Let me know if the link doesn't work.

Hopefully someone that can read schematics better than I can make sense of the section Titled "T30 USB, HSIC, ICUSB"

Looks like there is a function defined by a 100k resistor to ground on the ID line. Below that, there are also specifications for an eMMC device.
[Nexus 7 General] morbidpete:
eMMC seems to have all the pins needed to connect a Micro-sd card, DAT2, DAT3,CMD,VDD(2.7v),CLK,VSS(ground),DAT0,DAT1

::EDIT:: looks like that interface is already being used for the internal SD/Memory, we might be able to socket it?
[Nexus 7 General] seahorsepip:
Using he connectors of emmc for the sdcard? wouldn't that disable the emmc?

I had in mind to replace the emmc chip with a bigger one btw :P
[Nexus 7 General] morbidpete:
I was thinking the same thing, But throwing a microsd socket on it, using a thin ribbon cable to bring it to the edge of the case, Not sure how that would work with no OS being on the replacement drive, Scared to try
[Nexus 7 General] SchwassKIN:
????

What exactly am I looking at. And can you tell me how to replicate it if it works?
[Nexus 7 General] seahorsepip:
Can't we copy the partition table from the emmc drive over to the sdcard? We might need help from someone who's a expert on this :P

---------- Post added at 07:17 AM ---------- Previous post was at 07:15 AM ----------

That's pretty cool but I'm not quite a fan of having to use a switch to be able to use it :/ I'd rather replace my emmc :/
[Nexus 7 General] morbidpete:
Well, I guess a nandroid would work, I was thinking about selling mine as I never use it. I usually use my ipad. Maybe i'll give ti a go sometime next weekend.
[Nexus 7 General] maarawoe:
In fact the busybox contains dd so I think it should be possible to dd the partition table (or the whole drive) anywhere else...
[Nexus 7 General] HaiKaiDo:
While I dont think something like this is impossible at all....This seems a bit odd to me. If i had worked on something like this I would have gone about releasing it with more information.
[Nexus 7 General] Milamber33:
It's still a work in progress. Read the thread and you'll see all the information so far.
[Nexus 7 General] nst6563:
Check out the schematics I posted a page or so back. Maybe those would be of help to you?
[Nexus 7 General] SchwassKIN:
This thread is boring. Alot of pictures and nothing that works. Im not saying I could make it happen but I want to see some real results on this right now its a good idea but those are the only kind I have.
[Nexus 7 General] demkantor:
wow way to help the community, thanks for that
[Nexus 7 General] enohand:
i like many others are having issues powering & charging simultaneiously.

WTF do you want more? more

i tried this....

but it did not work,

& i tried that

& it did not work

be ****ing patient you SOB's

DAMN i hate people....& think im about to close this thread until more solid EVIDENCE or Proof of concept comes to light.

ill tell you this.

find a way to get me power (5v), while still be able to charge, & not have any issues with the SD card monuting & unmounting while plugging it in & out.

& i will release a quick easy/solder less way to do this
[Nexus 7 General] Roland Deschain:
Please don't close the thread; ignore the haters, maybe PM a mod or two and try to get them to do some selective editing? Whiny *****es can get the hell out of here. Sometimes I really feel like a misanthrope.
[Nexus 7 General] SchwassKIN:
Yeah close the thread till someone has something better than a picture of an idea.
[Nexus 7 General] jcollier:
I highly doubt the OP forced you to click, and read through this thread. If it bothers you so much, just don't click on it. It really isn't rocket science.
[Nexus 7 General] SchwassKIN:
Sorry for the hate. I just want this to work.

Im working on superglueing a flamethrower to my iphone I'll post pics when its finished.
[Nexus 7 General] demkantor:
I should have guessed you own an iphone

why is it trolls hate inovation of any kind? can't you just be happy playing sega in your parents basement?

anyway, don't shut down the thread this is something I'm very interested in and hope someone figures it out soon
[Nexus 7 General] SchwassKIN:
I don't really have an iphone sir gullable. Or a flame thrower lol.

And I wish I stilled lived in my moms basement, some guys have all the luck.

Now the majority of this thread is an argument lol
[Nexus 7 General] littleguy77:
This is a DEVELOPMENT thread. The whole point is to get the best brains together to solve REALLY HARD problems as a COMMUNITY. If you don't understand that, then you're reading the wrong forum.

@enohand - this is a great thread, I've been watching it since the beginning and trying to contribute where possible. It's a lot tougher problem than I ever predicted when we all started. We've uncovered a lot of dead ends. Keep up the great work and the positive spirit of innovation.
[Nexus 7 General] sgt. slaughter:
calm down guys. lets all take a chill pill and relax some... no more trolling or flamming in here
[Nexus 7 General] SchwassKIN:
ok
[Nexus 7 General] bigbop:
If you look at page 49 of the schematics, you will see in the upper left area, mention of power in from a docking station. This is separate from the USB supplied power input. Maybe someone with a fubared N7 can check out the PCB to see if those pins on the charging module are accessible.
[Nexus 7 General] SchwassKIN:
I am already charging my nexus 7 via pogo pins.

Look here:

http://xdaforums.com/showthread.php?t=1800099
[Nexus 7 General] Kuchar09:
What good would a flamethrower do for ya? Can u store videos n apps on it? Hook me up man!!!
[Nexus 7 General] Milamber33:
Where an iphone is concerned, applying a flamethrower to it sounds like the perfect use of technology to me. :p
[Nexus 7 General] morbidpete:
Hey Now

I have an iPhone, 5 to be exact, Nothing wrong with us!

Anyways. Be patient people. The OP is working on it. We are in talks about getting him the steady voltage he needs. All things in time! :good:
[Nexus 7 General] MakuseruSukotto:
This was in one of the car dash install threads, it's how they're doing USB host and charging, would it be of any use?

http://mehrvarz.github.com/otg-power-nexus7.html
[Nexus 7 General] nst6563:
Awhile back I mentioned that it may be a kernel hack to allow charging at the same time....this just may prove it.
[Nexus 7 General] iAppleDev:
really good news about the kernel patch:)

I'm still more interested in an easy way that won't require root or custom roms /kernels as there are lots of people out there who are not going to unlock-boot,root and install a custom Romjust to get extra storage.

This should work fine with or without the OTG switch.

Solder wires onto microUSB connectors on ribbon cable and run data+/- & 5V+/- to microSD reader then

1.- Ground ID pin permanently inside at connector.

2.- Build a very small micro USB connector with ID pin grounded that could fit in Nexus 7 and be removed (just the connector cut and stripped down with ID pin grounded).

3.- Use a switch for the ID pin
[Nexus 7 General] NicoGa:
We would all be pleased if you could try it!
[Nexus 7 General] jarayn:
I'm pretty sure anyone who is both willing and able to accomplished this is not going to bat an eyelid at rooting the device.

Great work though. Really would be a nice addition to the 7.
[Nexus 7 General] friedsonjm:
I think there is a retro-fit business in this for someone!
[Nexus 7 General] iAppleDev:
[YOUTUBE]youtu.be/DNUXETsKZYc[/YOUTUBE]

I have allready tried the wireing out and it works with a switch. I will have to root and install cm10 before I can test more:)
[Nexus 7 General] Nv1dia:
Is it possible to use a relay? When the charger is plugged in it provides power to a relay that will trip a switch to activate charging, and then when the charger is unplugged, it switches back to external memory...?
[Nexus 7 General] brando56894:
I was thinking the exact same thing lol
[Nexus 7 General] kendong2:
but they would open the case and solder on the tiny connectors? not so sure about that mate ;)