My Nexus 7 Car Audio Dash Install - Nexus 7 Q&A, Help & Troubleshooting

I have completed my nexus 7 install as my head unit in my 92 Dodge Diesel D350. These trucks have a din and a half radio in the lower portion of the dash, its hard to get to and see, fold out screens hit the "step" that is just above the radio position and once they are motored out, they end up in front of the AC controls. It just isnt a good option. Also since any in dash unit that compares feature wise to a Nexus 7 (besides audio output) would run about 800-1400 in price and would be to deep for the location I had in mind, it makes the tablet a no brainer.
I considered the Galaxy Tab 7 and tab 2 7.0 because of there HDMI output via dock but I just don't think I will be putting another screen in this truck so I opted for the better hardware at the same price as a used tab that would still work with AT&t.
One of my main goals was not to loose any of the functionality that I currently have in my set up. This includes, bluetooth hands free calling, and the basic automation that a true in dash has(i.e. on and auto play with key on and off and auto pause with key off) On top of that I was to gain google maps and internet connectivity along with android apps. In order to accomplish this goal, a combination of hardware and apps were used.
The hardware used includes a ar Charger 5V 2A charged bought on amazon that I hacked and wired in direct on an ignition source and a parrot MKI9000 that I use as a pre amp for the tablet, remote to control volume and track control for the tablet, and a hands free calling kit for my phone. In doing so, it auto interrupts the music for calls along with turning on the amps via the "mute wire" and a relay.
As for software, I used the stock apps along with tasker for the automation and equalizer for better audio control. I also use a volume widget as a back up since my parrot kit is my main volume control.
here is the stock dash before the install
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Now for the install
here is the "message center and AC control bezel removed, along with the new tablet bezel to aid in fitting the apposing aspect ratios
next I made a new AC bezel. I will attach this to the aftermarket dash kit that the radio was in before.
here is a shot of the AC controls mounted to the dash kit/bezel
Here is a picture of the bracket that holds the tablet in place.I used two existing mounts for some of the factory parts that are no longer there
now there is nothing left to do but put it all back together
Now this install was performed on a system that already had external amps. If you were to figure in the cost of amps, it may be cheaper to use a pre existing dash unit...but not near as cool

hmmmmmm i dont think this would be a great idea, but i would definitely look around for a car charger for it. For the power button, i think if possible put it in landscape mode, not portrait mode. But it'd be way easier if you mounted a phone of the same caliber. But it depends what suits your needs. Hope i helped

dB Zac said:
So I am going to mount a nexus 7 in the dash of my dodge and I need to get around a couple things. 1st I need to be able to charge the tab and have a working usb port. I I could simply unplug the charger when usb is needed but it would be better if I didn't have to. So is there a way to "t" this the usb to a charger or build a pass threw charger?
2nd thing is the power button. It will be permanently mounted so I will need access to the power button for reboots and such. I can try to make a mechanical extension or hard wire a remote button if possible. Can the board be soldered to or is it coated?
Any other ideas for the install are welcome! I hope this is the correct forum.
Click to expand...
Click to collapse
1. you could charge the Nexus 7 via POGO pins. You could make a dock with POGO pins. There's a thread about pogo pins in the Nexus 7 - Nexus 7 Accessories section. :good:

That's a good idea
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

Also, as far as the power button is concerned, I think it might be easier to utilize a magnet, emulating what a smart cover would do. It would be much safer and easier to implement.
Sent from my Nexus 7 using Tapatalk 2

Please explain, I'm not fallowing. Is there a magnetic "dock mode" switch?
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Have you seen the ipad 3's magnetic cover - when you open it it powers on? Well I think this is what he is talking about. If you can find a magnetic cover, then you could use it on the nexus 7 instead of using the power button.

I see. Not really the solution I would be looking for, for two reasons: I really don't need a way to turn on the screen, I am simply going to set the developer option to "always on when plugged in" and the power source would be an on with key "ignition" and the most important reason would be to cycle the power in case a reset is needed.
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This sounds interesting..
BUT.
Go to amazon.. search for small form factor (something similar ) Auto android pc..
You will find many very small android mountable pcs .150.00 and under with sd usb hdmi dvi on some s video..
then do a search for 7-10 inch(what ever size you can fit ) multi touch monitor . There are many of them..
I Have one of the small form factor android pcs connected to a old lcd tv .. kinda kewl it has gps and all built in ..
So i think for a just a small amount more money You can have something Better sorted for being installed in a automobile .
Good Luck... I

Most android pc's get terrible reviews, and to have something with a 7" screen would cost well over 200 and still wouldn't have jelly bean and Google navigation. I looked at the parrot unit, I even tried it at SEMA in Vegas. I it was clunky and slow for last year's standards. The off brand units are even worse.
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Nexus 7 Car Audio Dash install
I have completed my nexus 7 install as my head unit in my 92 Dodge Diesel D350. These trucks have a din and a half radio in the lower portion of the dash, its hard to get to and see, fold out screens hit the "step" that is just above the radio position and once they are motored out, they end up in front of the AC controls. It just isnt a good option. Also since any in dash unit that compares feature wise to a Nexus 7 (besides audio output) would run about 800-1400 in price and would be to deep for the location I had in mind, it makes the tablet a no brainer.
I considered the Galaxy Tab 7 and tab 2 7.0 because of there HDMI output via dock but I just don't think I will be putting another screen in this truck so I opted for the better hardware at the same price as a used tab that would still work with AT&t.
One of my main goals was not to loose any of the functionality that I currently have in my set up. This includes, bluetooth hands free calling, and the basic automation that a true in dash has(i.e. on and auto play with key on and off and auto pause with key off) On top of that I was to gain google maps and internet connectivity along with android apps. In order to accomplish this goal, a combination of hardware and apps were used.
The hardware used includes a ar Charger 5V 2A charged bought on amazon that I hacked and wired in direct on an ignition source and a parrot MKI9000 that I use as a pre amp for the tablet, remote to control volume and track control for the tablet, and a hands free calling kit for my phone. In doing so, it auto interrupts the music for calls along with turning on the amps via the "mute wire" and a relay.
As for software, I used the stock apps along with tasker for the automation and equalizer for better audio control. I also use a volume widget as a back up since my parrot kit is my main volume control.
here is the stock dash before the install
Now for the install
here is the "message center and AC control bezel removed, along with the new tablet bezel to aid in fitting the apposing aspect ratios
next I made a new AC bezel. I will attach this to the aftermarket dash kit that the radio was in before.
here is a shot of the AC controls mounted to the dash kit/bezel
Here is a picture of the bracket that holds the tablet in place.I used two existing mounts for some of the factory parts that are no longer there
now there is nothing left to do but put it all back together
Now this install was performed on a system that already had external amps. If you were to figure in the cost of amps, it may be cheaper to use a pre existing dash unit...but not near as cool

OK this is something I think will be right up your alley guys. I will use the "screen always on while charging" setting and the "sleep in 15sec" setting to emulate the same auto power on and off of a head unit.
My question is, can I use tasked or some other app to make all media no later what I am listening to or watching, stop when the screen times out or charging is stopped?

This is a fascinating project, sometimes the apps themselves have those options in them. I'd look there first. I would love to see how the turns out. Good luck,
Sent from my Google Nexus 7 using xda app-developers app

Well I picked up another dash bezel the other day and decided to start making room for the tablet since I'm waiting on the parrot piece to come in.
Here is a photo of the day as it is now.
So the plan is to relocate the AC control's to the head unit spot and put the tablet up in the message center/ AC control spot
The stock area for the other items isn't quite the correct ratio so I will still have to make a bezel
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Did some more work on the Tablet Project
O also used Tasker to emulate a head unit on and off function. So now the tablet wakes up and starts playing my music where ever I left off when the key is turned on and then the tablet screen, sleeps and the music is paused when the key is turned off. The tablet battery will act as the "always on" power lead and the charger will be connected to the accessory lead ( I may have to program in some delay or use the ign lead if tasker doesn't like the start cycle

Got it installed, I couldn't be happier with how it sounds. I still have to mount the A/C controls
Also, of any of you have a suggestion for a good charger to use that won't cause noise when hard wired, that would be great
Sent from my SGH-I747 using Tapatalk 2

I have actually done this with an Archos tablet myself! I can offer you one very useful piece of advice...
You most likely need to remove the battery and connect a 12 VDC->3.3 or 5 VDC DC-DC transformer. If you just leave it plugged in you will likely destroy the battery in about a year or less. When mine finally went I got random reboots from low power, sometimes it refused to turn on because the battery was barely able to supply the correct voltage. I had to solder my transformer leads directly to the motherboard but the Nexus 7 has a pluggable battery pack. Measure the battery at full voltage to see what voltage you need and buy the correct transformer. They are only a few dollars off ebay (lower quality) or digikey.com (higher quality). You don't have to worry about this right away but just know that it will most likely stop working reliably in < 1 year, so plan to either do this mod or buy a new battery.
Once I did the conversion all the problems have gone away and I'm now constantly at "47% charge".

Was it plugged into constant power or ign switched power? Mine is connected to switched power
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dB Zac said:
Was it plugged into constant power or ign switched power? Mine is connected to switched power
Sent from my SGH-I747 using Tapatalk 2
Click to expand...
Click to collapse
Mine was constant power. If you are switched it should be good - must have missed that part, lol.
EDIT: Actually, that's a very good idea... I wonder why I didn't do that in the first place, lol. I'm looking to upgrade to a Nexus 7 and would like to build mine into the dash but would have to relocate some things. When on AC/USB power, Tasker would have the screen on and when on battery the screen would be off. Only problem could be if you went a few days without driving it would be dead when you turned the car back on. Maybe that's what I was thinking when I did constant power. Maybe there's a NFC device that could be read only when powered on... That could be on switched power and Tasker could use that to control the screen. Oooo or maybe use the 'headset plugged' condition and a switched power relay...
Spec sheet says 12 days of standby time though, so maybe it's not an issue...
MORE EDITS: I re-read through your posts and figured I'd add some more input if you are still looking for answers. What is it you need the USB for? I don't see why you couldn't hack up a USB cable to feed power to the power pins on the tablet side (charging the tablet) as well as the USB device side (power the device) but have the data pins go from the device to the tablet. I just use wi-fi file browsers to add/remove files from mine.
Removing noise is always a PITA especially alternator whine. There are various filters out there that should do the trick though. I think you'll have noise using switched power but the filters go on the audio side before the amp/head unit. (Something like this: http://www.bargainunlimited.net/ser...gdftrk=gdfV21887_a_7c254_a_7c4406_a_7cSNI_d_1)
Tasker can be set to stop media playback on screen off - at least if you use the stock music app. Others (Pandora/Spotify, etc) I'm not sure about. I'd bet there's a way though. In fact... if you had to you could set Tasker to kill whatever app when the screen turns off and launch it again when the screen turns on.
Power button could be an issue to extend but should definitely be possible if you want to play around on the insides. You could get an app that adds power off/restart as menu options or widgets but if the whole thing locked up you would have to pull the battery. You could add a small switch inline from the battery pack so you could interrupt power with a button press effectively "pulling" the battery and plugging it back in.
Other thoughts/stuff I missed? I love doing this kind of stuff so I'm happy to add any input.

The head set idea won't work unless you hardwired it. All I had was a 90deg elbow with nothing on the other end and it still detected a head set
As for the tab dieing. I use Tasker to shut off all radios when not charging. In that state it will last 2weeks lol.
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Related

Incredible car project

I've had my Incredible for a month or two now, and rooted it the day I picked it up. I've dug all over this forum learning the ins and outs of this phone, and figured I'd finally give something back.
Car audio has always been a big hobby of mine, and I actually competed in sound quality a couple of years back. So, while researching the Incredible, as soon as I discovered the tv-out cable, my first thought was to feed it into my car. I was very proud of myself thinking I was the first person to come up with this...until I started searching, and realized I wasn't. At all.
Either way, it was hard finding info on this solution because google pulls nothing but details about the cable, and very little on the solution, so I figured I'd put what I've got here.
I have a 2005 Honda Accord with the factory 6 disc changer in the dash. The dual zone climate controls are integrated into the factory radio, so if you remove it, you lose that functionality (which I didn't want to do). There is a large storage pocket that is removable underneath the radio that allows for an aftermarket head unit, and lower dash kits are available for doing that.
I've gotten out of competition, and just have the factory deck now, but wanted a way to play music from any phone I had. PAC makes auxiliary input adapters that integrate with factory radios for just about any car. I bought one for my car, installed it, and can now plug in anything via 3.5mm headphone jack or by RCA.
When I got the phone, my first idea was a car dock where I could plug in the headphone jack and then charge it, but I hated the idea of having to deal with two cables every time. I had started off using CM7, liked it, but read people complaining about no tv-out functionality, which I could care less about, but the option being available meant that audio going out would be no problem, and since the cable has another input for charging, I could have a one plug solution, and so the project began.
I flashed my phone to SR4.0 to have the tv-out capability, (and love the ROM. I like a lot of the more sense based layouts)
First, the cable. The phone only recognizes tv-out when the video input is connected. This posed a problem for me, as I only needed audio. If the solution has been posted before, I couldn't find it, but if you take a female rca jack, or use a male rca jack with a coupler, and short the signal and ground wires together, the phone goes into tv-out mode and will send audio. I had a cheap pair of radio shack rca's laying around, and cut one end off to test this, and it worked flawlessly. In car audio, they're called muting plugs, and are used to troubleshoot engine noise issues.
Second, the charger. I didn't want to use my car charger port, so after some light research to make sure I wasn't missing anything, I confirmed you can take a car charger apart, solder a ground wire to the wire connected to the metal that sticks out of the side of the charger, and solder a power wire to the part going to the tip. On the charger I used, a fuse was inline, and if you want to retain that, you can use a large zip tie and heatshrink to retain it. I didn't b/c the charger was cheap, and if something was to ever short, it'd burn that out first. Regardless, solder leads to power and ground, and then tap into the wiring going into your factory accessory outlet (or cigarette lighter). Use a test light or multimeter to determine power from ground.
Third, the dock. Google sucks at finding good horizontal docking solutions. My first idea was to buy a horizontal cradle and fab it into the lower dash kit, but that's a lot of cutting, as well as having to remove the usb plug on the dock (because it's not extUSB), and really at the end of the day, you just need an L shaped piece of plastic with a hole cut out where the usb is. I was looking at Droid X docks with my friend, and noticed there are a lot of swivel mount car docks for that phone, and thought that'd be a lot easier to do. Further searching led me to proclip.com where they have docks for about any mobile device. *I tried posting a link, but spam got me* I found them while searching for docks thanks to someone on an ATV forum linking the site. It seems people are using their droids for navigation while going off-roading, and use these docks to keep them anchored.
On the quick search at the bottom of the main page, check the box saying you already have a mount, then under holders, select HTC Incredible to pull up the docks. I purchased 511147, holder with tilt swivel, and received it two days after ordering. It's very rugged, and the swivel seems well built. The mount on the right provides room to comfortably plug in a charger or cable, and I'm going to fab a piece to attach the tv-out cable and charger, and route the wire behind it and through the kit. The dock will be attached to the lower dash kit, and a little ABS plastic, epoxy putty, and paint will smooth over any seams. The other nice thing about this for me is the lower dash kit has a cutout for an aftermarket radio, and a spare pocket underneath. Using the dock, I still have full use of the pocket.
If you don't want to do this much custom fabrication, you can use one of their solutions. On the main page, select your car make and model, and they will provide you with the mounts they have. Their mounts attach to the car without screws or tape, and then from there you select your dock, which attaches to the mount.
Sorry this is long and somewhat rambly, but I've seen a lot of posts and questions asking about this kind of solution, with no clear definitive answer. I drove to work this morning listening to pandora via the tv out cable on my factory radio, with the phone being charged and zero problems.
Another side note, there is an adapter for the HTC Hero that is an extUSB plug that goes into a piece that has extUSB input, power input, and 3.5mm out. It's a lot more ideal for this solution, but doesn't work. The extUSB plug is shaped differently, and the pinouts are laid out differently in the plug. If someone was good at soldering, it'd make an even cleaner solution, as you could rout the adapter behind the dash and plug everything into it.
If someone was interested in swapping the ends on that adapter with one that'd fit the Incredible, I'd be willing to pay for it, just for the lower profile and aesthetics of what I'm doing.
I'll update this with pictures once I get it all installed. Hopefully this is helpful, and I didn't just waste a bunch of time typing what was in another post that I've been unable to find.
Thanks for wasting 5 minutes of my life. Just kidding. Thanks for the write up. Can't wait to see pictures.
Sent from my ADR6300 using XDA App
I was going to wait and reply later, But I have been reading up on this subject, There are a lot of people using pads and removing there radios. So to see a phone doing this hope the pics are good
It'll be next week before I can get any up, headed out of town for the weekend tomorrow, but will grab pics of what I have now and will show the install progress as I go.
Hopefully I can get to 11 posts between now and then so I can throw up pics and links to what's going on.

The ultimate solution for In-car entertainment, but how ?

Hi folks.
I am looking into installing my Nexus 7 permanently in the car, needing the use of being able to charge it, and use an USB DAC at the same time.
This page promises to have an ROM that is able to do that, but I have been unable to get that to work at all. I do not want to upgrade to 4.2.x due to the known bugs, so it's 4.1.2 for me at the moment.
http://goo.gl/fQ2LL
Using a stock ROM i am able to start/stop playback with Tasker registering "AC charge" - How do i go about this when using an OTG-Charge ROM ?
I do not want to charge the tablet when i'm not driving the car, what happens to the USB DAC when the power is cut, does it lose sync with the Nexus 7, and requires a reboot to function again?
So in short this is what I had in mind:
Ignition on -> Tasker registering AC power, starts playing music.
Ignition off -> Tasker registering power is off, pauses music, tablet go to sleep after at set amount of time.
I am realising that this may not even be possible, I can't see how the USB connection should survive, when the power is being cut, but maybe some of you more experienced guys can chime in on this subject.
I would rather not make any modifications to the tablet, but if this is neccessary to make it work, i'll have to do it (e.g. feed power directly to the battery with Li-Ion charging circuit.
Any other ideas of letting Tasker know that the car is started ? I have a bluetooth handsfree in the car, but that is connected to my iPhone, so I cannot use that as a wakeup function when that connects as Tasker do not have any "Blutooth Near" functions...
I've tried to connect 5V to the POGO pins on the side, but it won't charge the battery this way (it's enabled in the 4,2,x ROM afaik)
I've wired up my USB OTG cable like this: http://goo.gl/vqc3F
Any ideas is very welcome, as I cannot see how to do this.
Regards,
// Per.
I'm looking at doing the same thing but also a USB flash drive and also a Joycon EX Steering Wheel Control PC Interface via USB.
What I'm debating on doing is instead of hooking the charger to the ignition to turn on n off with he car I'm thinking about using constant power and hooking up an input on the joy on to the ignition 12V and setting the screen to come on n off with the car.
Unfortunately this means the tablet will be on the charger 24/7 but not sure how else to make sure everything reconnects as it should.
Anyone else have any ideas?
Sent from my Nexus 7 using xda app-developers app
I'm planning on doing a car install with all the bells and whistles also:
Joycon Ex
USB DAC (E10 or Behringer?)
USB Hard drive
Powered USB Hub
From what I've read of other threads, some people have trouble getting the DAC to reconnect after power changes, and some don't. In general, the rule of thumb is as long as the N7 is booted with the DAC attached, you should be able to unplug (or stop powering it), and then start again. There seem to be some behavioral exceptions with this (e.g. if you don't stop audio playback before putting the tablet to sleep with tasker, when it wakes up, you may need to fiddle with it before it starts working again).
It's a long thread, but I'd recommend reading this:
rootzwiki.com/topic/30615-can-you-charge-usb-host-mode-simultaneously/page__st__140
Timur has provided multiple patches that are trying to satisfy everyone's exceptions in trying to get this working.

[Q] Flat batteried Nexus 7.....battery connector pinouts?

Hi all,
I have had my 7 for a while however I left it for several days after it ran out of juice and I'm now experiencing the issue where it cannot charge via usb. I have an appropriate battery charger and intend to juice the battery up slightly whilst disconnected from the pad to give it enough power to rise from the dead and charge normally.
Has anyone looked into which of the 6 connections coming from the battery do what? There are obviously 2 red, 2 black, a yellow and a white. Is there something like a 5v, 12v and data connection??
Can someone educate me to which connections I can apply voltage to, to charge it please?
I would rather go down this route if possible rather than going through warranty as I have no backup of the items currently on my nexus.
Any help would be very appreciated.
Cheers,
Rob
What little I know about Li Po cells/batteries is:
The nexus 7 has a single cell battery rated at 3.7v - no 5v or 12v
Charging outside the Nexus is DANGEROUS. Protective bags are used to hold LiPo cells whilst charging (and transporting them).
Where the wires enter the cell there is a thin section that will be a PCB with protective electronics that will monitor the temperature of the cell.
Your red/black pairs COULD be a pair for charging and a pair to power the Nexus and the white and yellow ???????
Your charger should have this info in its instructions.
Two remarks to finish DON'T DO IT and search Youtube for "LiPo overcharge"
I've done it with phone batteries when I've been at a mates or something and I've ran out of battery and not had my charger.
Its safe, provided you give it the correct voltage, to the correct pins lol, and don't try and fully charge. Give it 50% of its normal charge time max. But since you only need to get into the boot loader to properly power off so it will charge again you're only speaking about a quick ten minute charge..
As for the two pairs, its maybe a 2 cell battery.
White and yellow are likely temperature sensor.
Sent from my Nexus 7 using Tapatalk HD
knuckles1978 said:
I've done it with phone batteries when I've been at a mates or something and I've ran out of battery and not had my charger.
Its safe, provided you give it the correct voltage, to the correct pins lol, and don't try and fully charge. Give it 50% of its normal charge time max. But since you only need to get into the boot loader to properly power off so it will charge again you're only speaking about a quick ten minute charge..
As for the two pairs, its maybe a 2 cell battery.
White and yellow are likely temperature sensor.
Sent from my Nexus 7 using Tapatalk HD
Click to expand...
Click to collapse
I'm facing exactly the same problem, and no "normal" work-arounds seem to be working for me, I just can't get into the bootloader. So it is either trying to recharge it myself or buying a battery..
So given the fact that you have done it with other devices, could you please explane how you would start with all this? Here is a picture of of the nexus 7 battery connector, if it would help you:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
(the picture is from ifixit).
I was thinking about molesting the usb cable of my htc and use the black and red cables to charge the battery (I suppose that a USB output can not put a to high voltage to the battery?), but I do not know which red/black poles to use on the battery connector..
Thank you very much in advance!
Erwin
Ive never done one with two pairs like that, but here's what I'd do to get enough charge to boot at least. I would connect my positive from the charger to one of the battery connectors reds, and connect the negative to one of the blacks (obviously lol). Give it 5 minutes only, then swap your negative charger wire onto the other black of the nexus. Give it 5 minutes only again.
Then swap your positive charger wire over to the other red of the nexus and repeat the process, keeping the positive on that red and connecting the negative to each black for 5 minutes.
You only need enough charge to boot, so this will be fine. Also, keeping it to 5 minutes each keeps it safe.
An even better way to do it would be wait until tomorrow until I can get a hold of a multimeter and i would check to see how the pairing is, then you could do it without the guesswork. But if you can't wait, I've told you the way that i would do it.
Sent from my Nexus 7 using Tapatalk HD
knuckles1978 said:
Ive never done one with two pairs like that, but here's what I'd do to get enough charge to boot at least. I would connect my positive from the charger to one of the battery connectors reds, and connect the negative to one of the blacks (obviously lol). Give it 5 minutes only, then swap your negative charger wire onto the other black of the nexus. Give it 5 minutes only again.
Then swap your positive charger wire over to the other red of the nexus and repeat the process, keeping the positive on that red and connecting the negative to each black for 5 minutes.
You only need enough charge to boot, so this will be fine. Also, keeping it to 5 minutes each keeps it safe.
An even better way to do it would be wait until tomorrow until I can get a hold of a multimeter and i would check to see how the pairing is, then you could do it without the guesswork. But if you can't wait, I've told you the way that i would do it.
Sent from my Nexus 7 using Tapatalk HD
Click to expand...
Click to collapse
I'm trying to be patient for almost a week now, so one day (or more, if you need them) will not be a problem Take as much time as you need, I'm already thankfull that you are willing to look into it!
All the best,
Erwin
ErwinP said:
I'm trying to be patient for almost a week now, so one day (or more, if you need them) will not be a problem Take as much time as you need, I'm already thankfull that you are willing to look into it!
All the best,
Erwin
Click to expand...
Click to collapse
I'll be able to get a multimeter tomorrow for sure, that way i can check it out properly for you. The other way is safe and would definitely work though, but its no problem for me to check it out.
Sent from my Nexus 7 using Tapatalk HD
Again, thank you already in advance, I hope this gets me out of trouble. What an inacceptable bug, bah.
One additional question though, if you don't mind. What are your thoughts of using the stripped usb cable an my laptop to deliver that little bit of battery juice? I'm good with my hands, can replace every part of your bike and am able place a new smartphone screen with my eyes closed, but I just don't know anything about the real hardcore electronics
All the best,
Erwin
ErwinP said:
Again, thank you already in advance, I hope this gets me out of trouble. What an inacceptable bug, bah.
One additional question though, if you don't mind. What are your thoughts of using the stripped usb cable an my laptop to deliver that little bit of battery juice? I'm good with my hands, can replace every part of your bike and am able place a new smartphone screen with my eyes closed, but I just don't know anything about the real hardcore electronics
All the best,
Erwin
Click to expand...
Click to collapse
It is not a bug. Your tablet has entered a sleep mode to prevent t the battery from being damaged. I have previously posted the procedure to enable it to charge and wake again. Search through my recent posts for the fix- I unfortunately can't link it right now due to time constraints.
ETA: Plug your N7 into the charger and immediately press power and volume down to get into the bootloader. Once there, use the volume key to scroll to Power Off Device and then press the power button. After it powers off, unplug it and then plug it back in. It should then charge normally.
Sent from my Nexus 7 using Tapatalk HD
najaboy said:
It is not a bug. Your tablet has entered a sleep mode to prevent t the battery from being damaged. I have previously posted the procedure to enable it to charge and wake again. Search through my recent posts for the fix- I unfortunately can't link it right now due to time constraints.
Click to expand...
Click to collapse
I'm sorry, but this is a bug and not a feature of the device protecting you. If the device runs out of battery, it should do what every other tablet and smartphone does: shut down. And it should shut down 'way before' the battery is completely out of power, so that it still has a fair amount of battery capacity to at least once initate startup, notice that the battery is too low to continue and shut down properly. Of course, if you try to restart the device several times whilst it doesn't have any battery power left, then you are damaging your device. But than you are an idiot as well
Look at wat happens when you are working on your N7 and power comes to 0%. Indeed: it will shut down properly and you will be able to charge it without any problems. However, if battery comes to about 10% and you do not shut it down manually but leave it just sitting there, the device will do what it normally does: it goes to (deep?) sleep. However, even deep sleep consumes battery and inevitably you will reach the point where the battery is at 0% (seen by the android device). But instead of waking up and shutting down the device properly, it just stays into its deep sleep, consuming power and finally undercharging your battery making the device totally irresponsive. This is what I call, a bug.
I know now that I should either shut down or recharge my N7 when I come to the point of 10-15% battery. But hey, once you learn that, it is too late, this is why I'm here
najaboy said:
ETA: Plug your N7 into the charger and immediately press power and volume down to get into the bootloader. Once there, use the volume key to scroll to Power Off Device and then press the power button. After it powers off, unplug it and then plug it back in. It should then charge normally.
Click to expand...
Click to collapse
Thank you very kindly for your help, but as stated before, I have tried everything already. Including a whole evening trying to get the timing right to see the android bootloader following the solution you mention. But it doesn't give anything but frustration. So I understand why you point to that solution, but that is one of the first solutions that comes up if you google my N7 phenotype. Again, thank you kindly, but for now I do not see any other solution than trying to get an inital voltage in that battery manually.
Best regards,
Erwin
Same issue has happened to me and I can not even enter the bootloader...
What is your status on this issue?
SubZero5 said:
Same issue has happened to me and I can not even enter the bootloader...
What is your status on this issue?
Click to expand...
Click to collapse
did anyone charge it manually out of the nexus ? I've verified that the black is - and the red is + with a multimeter. battery reads .47 with multimeter. If you guys are going to charge it 5 minutes per pair, definitely get a multimeter to read the positive and negative coming out of the 5v chargers.. also, make sure that it's about 5 volts cuz some are about 6? I dont' know if having too high of a voltage will fry it.. i do know from experience that some usb chargers are 5 and some are 6 volts and some are even slightly more. I'm talking about getting a transformer that goes from usb to the circular out put head..
Same problem here. Someone on another thread was suspecting the magnetic cover causing problem and I'm using one too. Anyone having this problem NOT using a magnetic cover?
I know this is thread is a few months old.
donnygg said:
Same problem here. Someone on another thread was suspecting the magnetic cover causing problem and I'm using one too. Anyone having this problem NOT using a magnetic cover?
Click to expand...
Click to collapse
I have a similar problem and my n7 has never had a case.
Update
I hooked the battery up to a usb port using the out side read and black wires, red was + black was - charged for about 1 minute via pc usb power while monitoring with a dmm. the tablet now charges normally.
Charge manually
chevyowner said:
I know this is thread is a few months old.
I have a similar problem and my n7 has never had a case.
Update
I hooked the battery up to a usb port using the out side read and black wires, red was + black was - charged for about 1 minute via pc usb power while monitoring with a dmm. the tablet now charges normally.
Click to expand...
Click to collapse
I did charged the battery manually.
For about 1 minute for each pair of red/black.
Not to bump an old thread but manually charging indeed fixes this problem. Used a multimeter to take a reading from one nexus 7 and then cut up an old usb and hooked it up to the ends of the multimeter and placed them on the first 2 points. Charging manually up to about 3.7ish should be enough to accept a charge.
Thanks guys saved buying a new battery.
i have a bit of life after manually charging, is it important to do both pairs of black and red? I have 2 batteries and now the nexus flashes an empty battery logo up when i hold the power button, its better than before as nothing came up at all but still wont boot up
I just charged my battery up manually using a proper Li-Po battery charging unit, left it charging at 2.5A until it hit 4.0V. No problems.
I did not charge up both pairs. I believe this is unnecessary: see first image in this thread: http://forum.xda-developers.com/showthread.php?t=2311799
The pairs of red and black are actually soldered together, so it doesn't make a difference which pin you apply the voltage to.
I would be worried about charging the battery directly with a 5.0V supply (ie. USB voltage). Don't do it if you can avoid it.
If at any point when charging a battery directly you notice it getting hot, stop immediately.
External charging nexus 7 batteries
Use the black - and the red + wires to charge .Charge the outer red and black wires ,I use a 5 volt charger since these batteries are rated at 3.7 v + or - .5v Charge the batteries to a voltage reading of 4.2 volts this will be a full charge.Please Note you will be charging this battery with out a protection over voltage or temp sensor system. If the battery is bad ,will not take charge due to damaged cells, or is overheated while charging they will burst apart.Charging with out protection circuits can damage batteries and also harm yourself.You do this at your own RISK.
@knuckles1978, @androiddeveloperg, @mr portugal, @chevyowner, @VanquishUK
Thanks guys!!
You saved my Nexus 7!
I charged the battery with my computer's usb port and a multimeter connected, let it charge to 3.90V (with power), and it booted up again
Now I have to get it to 100%, as it still shuts down after booting..
Sent using my nexus⁴ running Mahdi 2.8 with Xposed and hells-Core B64
Bitcoin donation address

[Q] Droid X Battery Hard wire to car.

Hello,
this is a bit of a custom job. I want to take my Droidx and make it a dedicated display in my car. My issues are the battery is shot and buying another is more investment than I prefer. also the battery is not going to work for what i'm doing because it will not be on charge as frequently as it need to get a full charge.
so here is what i want to do. I want to hard wire the battery terminals to a 3.7 vdc source and use that as the primary power to the phone. and use the usb power to wake it on entry and while the ignition is on. right now i've got the usb cord without the battery and it works fine. but I wanted to maybe use the battery/usb to wake it. Anyone able to power the phone on the terminals for the battery?
Thanks
-xpbr2000
xpbr2000 said:
Hello,
this is a bit of a custom job. I want to take my Droidx and make it a dedicated display in my car. My issues are the battery is shot and buying another is more investment than I prefer. also the battery is not going to work for what i'm doing because it will not be on charge as frequently as it need to get a full charge.
so here is what i want to do. I want to hard wire the battery terminals to a 3.7 vdc source and use that as the primary power to the phone. and use the usb power to wake it on entry and while the ignition is on. right now i've got the usb cord without the battery and it works fine. but I wanted to maybe use the battery/usb to wake it. Anyone able to power the phone on the terminals for the battery?
Thanks
-xpbr2000
Click to expand...
Click to collapse
The phone works without a battery. Maybe bypass it and connect to USB?
Sent from my SCH-I605 using xda premium
You'll need to have a battery or something to keep it from just turning off when you turn off the car, won't you? I looked into doing something like that with the RasPi, and I you're not supposed to just remove the power supply.
Or can you wire it to wear it has power when the car isn't running?
sghsmorgan said:
You'll need to have a battery or something to keep it from just turning off when you turn off the car, won't you? I looked into doing something like that with the RasPi, and I you're not supposed to just remove the power supply.
Or can you wire it to wear it has power when the car isn't running?
Click to expand...
Click to collapse
if i could figure out what the battery supplies the phone then i could wire a 3.7v source to the battery terminals on the phone.
I've had this system wired up for a couple months and it works great. the only issue i've had is the age of this battery makes it not take a charge. so in the heat of the day i get in the car and the battery temp is 100+ the phone is dead because the battery doesn't operate. and the charger can't charge the hot battery and keep the phone powered. I never liked the idea of a battery inside the car. heat + battery = boom (maybe not but it could cause a big mess and damage the phone.
the question i need answered is what is required for the phone to run? what do each of the battery terminals do? obviously one is ground (marked) and one is positive (also marked) the middle terminal has to do with a temp or charge signal. it doesn't power on just the positive and negative to the best i can test it. maybe i'm doing it wrong.
and i have looked at a rasPI. we have one. but i can find a capacitive touch screen that is small enough to fit in my dash (4th gen camaro) without deleting my radio which isn't going to happen. plus they are expensive. idk y tablets and such are cheaper with the same type screen plus the hardware of the tablet.
Almost! Cept with a Hero!
OP: If you still have the battery, you should be able to find the Amperage listed in mHa near the voltage on the batteries sticker. After you have these 2 values you should be able to construct a small circuit to drop your cars internal voltage down to the appropriate level. Hook it up to the 12v from your car at Ignition/Accessory if you want it on whenever you can use the radio, or to the Constant 12v, after the fusebox, to have it usable whenever your car doesn't need a jump! Best of Luck!
So, I'm actually trying something similar right now except with a HTC Hero with a bloated battery that refuses to hold a charge. I've tried several times to boot the phone with just the USB cable, but all I get is a red battery icon : / I'm looking to just hardwire this stupid thing to a plug or even a 9v alternative. This is gonna be used around my house for various things
As of my posting this, I've found 3 threads on slightly similar topics, none with very good/any info tho. Thank you in advance for any help!

In-dash Install - My Setup and Need Info/Advice

So, I have had my Nexus 7 installed in my 2007 Toyota Tacoma for 7 months. I use the Behringer UCA202 DAC($20). I am a cheapo so I preferred $20 over the $76 Fiio E10K that is supposed to be better. I also like that I have a mic input that works on the UCA202. Makes voice search and phone calls possible. Grounded the outside of the rcas to the chassis to help with the electrical noise. Used Premium Monoprice RCA cable to also help with the electrical noise. ($7) Using Alpine KTP-445U($114) to amplify the tablet audio output to the speakers. (Rockford P1675-S in the front and P1675 in the rear, $200) I needed my steering wheel controls to work so I used the Joycon EXR Steering Wheel Interface ($58). Its setup took a couple hours but after I completed the setup I have had ZERO issues with it, LOVE IT! Please note that the Joycon EXR will only work for analog steering wheel controls. You would need the EXC($92) for CAN, IBUS, resistive, and digital steering wheel controls. Used a cheap usb otg charging adapter for allowing usb otg while charging. Be careful with these some cords will allow this, some will not. Pay attention to reviews to get some insight but even then it's a shot in the dark. You also need to make sure that it is a high quality cable so that the wire gauge can handle the current for fast charging. RTL2832U DVB dongle for being able to receive FM stations on the tablet. Also used a cheap 4 port usb hub. Used three of the ports for DAC, EXR, DVB.
Okay, all done with my setup. Now on to getting some advice. I used to use Timurs Kernel for 5.1, cost me $20. It worked okay but it would often freeze when I shut off my truck so the tablet would then reboot after 20ish seconds. 3 months after I bought LP Timur came out with MM. But, he wanted me to pay for that one as well. Hell no. I emailed him, he wouldn't upgrade me without paying. Didn't want to pay for his kernel in the first place so there was no way I was going to pay for it again. So... I decided to take on the setup of the tablet for Fixed install on my own. I installed Cyanogen Mod (13.0-20160827-NIGHTLY) with the Elemental X kernel version 3.16 (last reported version to include working usb otg + fastcharging) Well I get charging + usb otg but its not fast charging. No big deal, I can deal with that for now.
The problem I am having is that I cannot for the life of me figure out how timurs kernel would only lose 1% of batterylife in 12 hours when the truck was turned off. I have tried multiple things, done a ton of research and nothing seems to get close to 1% for 12hrs. The best solution I have found is using the apps Greenify, No Wakelock, and Force Doze as well as disabling Google Sync completely. This has gotten me down to about 8% for 12 hours. When I previously used Tasker as the overall solution I was losing 12% for 12 hours. (disable WiFi and location, enable airplane mode, enable battery saver)
Anyone have any tips to improve the drain while my truck is off?

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