rohan32
Retired Forum Mod / Retired Recognized Developer
Wow, looks really nifty and would be awesome if it becomes working! Keep up the great work OP!!!
Cloud storage doesn't much help when you want to play games, have multiple backups, and a slew of ROMs to switch between. I'm already having to make cutbacks (deleting two games) on my 16gb and I've had it for two weeks. There are no pictures, music, or movies on here either.
Just a quick heads up... the two red leads coming off of the battery aren't 7.4V. It's a two cell Li-poly pack, and they have leads for each battery. The red wires are each 3.7V, so my idea to use a 5V voltage regulator is out the window.
I've seen about a half dozen people trying this and it all still comes down to one problem: finding an alternate 5V supply. The data leads and ground isn't a problem. The way the micro USB port is set up, it's using the neutral lead on pin 4 as a switch. In it's normal state or when a charger cord is plugged it, the micro USB port works as a voltage "input", but when an OTG cable (which has the neutral lead spliced to the ground) is plugged in, it switches to "output" mode and supplies 5V to the attached device. Plug in a charger while the OTG set-up is running, and the switch shuts off and drops the external device. Supposedly, there's a workaround where you solder a resistor between the neutral lead and the ground and OTG works with charging, but I haven't had any luck. I've read resistor values of 32K Ohm - 100K Ohm working for various devices, and I've tried several values on the Nexus with no success. It we could find a 5V source, we could bypass the whole micro USB port and the neutral switch is a non-issue. I've tried searching for a source, but I've stopped short of disassembling the tablet to get to the front side of the main board.
Keep in mind this is just based on observations and research on my end. It's very possible that I'm wrong, and there's an easier solution.
Cant use a 5v dc-dc step up for the 3.7? They make then for the energizer cell phone chargers, maybe gut one or grab a parts list? I'll peek at digikey
Cant use a 5v dc-dc step up for the 3.7? They make then for the energizer cell phone chargers, maybe gut one or grab a parts list? I'll peek at digikey
---------- Post added at 02:45 PM ---------- Previous post was at 02:41 PM ----------
looking around they seem rather large, about 1" square, No idea where that could fit, Maybe desolder the components, Connect with magnet wire ( epoxy insulated) and hid in random spaces, Can you give me a link to the Micro SD board you chose, I might order these and see if I can squeeze them in somewhere in preparation for your finished products
Cant use a 5v dc-dc step up for the 3.7? They make then for the energizer cell phone chargers, maybe gut one or grab a parts list? I'll peek at digikey
---------- Post added at 02:45 PM ---------- Previous post was at 02:41 PM ----------
looking around they seem rather large, about 1" square, No idea where that could fit, Maybe desolder the components, Connect with magnet wire ( epoxy insulated) and hid in random spaces, Can you give me a link to the Micro SD board you chose, I might order these and see if I can squeeze them in somewhere in preparation for your finished products
---------- Post added at 02:48 PM ---------- Previous post was at 02:45 PM ----------
Found a super tiny one!
http://www.circuitsathome.com/store
Just a quick heads up... the two red leads coming off of the battery aren't 7.4V. It's a two cell Li-poly pack, and they have leads for each battery. The red wires are each 3.7V, so my idea to use a 5V voltage regulator is out the window..
Just incase it wasn't mentioned, the NFC is.. on the back of the casing itself (take off the back and look for yourself at the square rectangular box labeled NFC antenna ) The antenna then connects to motherboard via those tiny metal contacts.Dont see how this is possible thats the nfc unit where the sd card is being placed. No connectors are there to mount an sd card.
well how do you expect to charge a 7.4v battery from a 5v power source such as usb?
if you didnt know that much then you should quit while your behind.
It always pleases me immensely to come across such developments being made and shared here at XDA, even if I don't possess the device in question or don't have the necessary skills (or balls) to apply these hardware mods myself.
At the same time, it really saddens me to see many members here being total jackasses, responding rudely with their lameass remarks, downright DEMANDING the OP to release the work quickly, and even resorting to taunting them and calling it fake if it's taking them a while, when they have absolutely no idea about the whole thing themselves.
I am writing this post in support of all the developers like the OP here who are passionate enough about their devices to risk damaging them while applying such mods, and are more than happy to share the fruits of their labor here with the community, all without expecting ANY monetary compensation except for the appreciation of those they are kind enough to share their work with. It is completely uncalled for of the jackasses to behave rudely to them, while they are themselves not doing anything other than being free-riders, not contributing anything positive to the community, and at the same time spreading negativity with their crappy behavior.
While making use of the developments here without contributing any developments of your own is fine because obviously not everyone has the required time or skills for all of this, it's simply unacceptable to contribute negatively to a community that gives you so much for free due to the generosity of others, without asking you for anything in return. Heck, you don't even have to thank or reply at all if you choose not to; if you can't say anything positive, you can still just make use of all the developments here silently without saying anything at all. While it is encouraged and much appreciated, there's still no rule or obligation on showing appreciation being mandatory. Just don't go about being jackasses and being rude to the developers at least!
OP and other developers out there, please don't let what such jackasses say keep you from what you're doing. While there may be many of them around, there are still many of us who genuinely appreciate your work and understand the effort you put into it. Kudos to you, and thank you for making XDA what it is.
Before I finish my rant, I would request the moderators to be more strict towards such jackasses, as they contribute nothing positive here and at the same time likely drive potential developers away and harming XDA because frankly speaking, who would want to share the fruits of their labor for free with those who don't show appreciation respond back in such a way?
When you're ready for implementation ill be happy to help. Find the block device the kernel makes, create mount point in ramdisk, add entry to vold.fstab for the volume daemon, jb should have needed framework, update permissions for external storage. Just gimme a holla. :highfive:
/\/\ jackass alert!well how do you expect to charge a 7.4v battery from a 5v power source such as usb?
If you didnt know that much then you should quit while your behind.
don't have a nexus 7 (hoping to buy one soon), but a 3.7V power source will not power a flash drive, Just tried with an old 64MB flash drive by clipping the 2 power pins then attaching some wires then taping it to a 3.7V cellphone battery while connected to a USB extension cable. the light comes on but the computer doesn't detect the drive.
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I don't consider this trolling, its stating a fact. Without proof you can only act on the evidence given. It looks fake