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Old 01-13-2013, 12:55 PM   #251
zedix
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Quote:
Originally Posted by onsit View Post
The 12v to 5v usb converter seems to output only 500ma, and it's visible to the system as a "usb charger"

Now.. I dont feel like ripping up the converted and sodering the 2 data wires into 1 wire, causing Android to think it is a Power Source only mode.

Is there a rooted kernel available that forces all charging to AC MODE?
I can confirm that the CPT converter from china is visible to the system as USB charger instead of AC charger. As far as I can tell, this doesn't impact charging rate.

I also cut the wire in the middle, shorted the white and green data wires, and Android still reports it as a USB charger...

Did a few tests and compared it to the wall charger, it seems to charge at about the same rate. I also confirm that it outputs more than 500mA even if the system reports it as USB charger (as per thread above - shorting white/green does not make an impact on charging rate).
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Old 01-13-2013, 01:20 PM   #252
onsit
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Quote:
Originally Posted by zedix View Post
I can confirm that the CPT converter from china is visible to the system as USB charger instead of AC charger. As far as I can tell, this doesn't impact charging rate.

I also cut the wire in the middle, shorted the white and green data wires, and Android still reports it as a USB charger...

Did a few tests and compared it to the wall charger, it seems to charge at about the same rate. I also confirm that it outputs more than 500mA even if the system reports it as USB charger (as per thread above - shorting white/green does not make an impact on charging rate).
333ma charging is kind of slow, compared to the 1.5 you would get with an AC charging mode =/

It is afterall a simple Kernel tweak.
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Old 01-13-2013, 01:41 PM   #253
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Quote:
Originally Posted by onsit View Post
333ma charging is kind of slow, compared to the 1.5 you would get with an AC charging mode =/

It is afterall a simple Kernel tweak.
CONCLUSION:
1. Nexus 7 OEM charger is nothing special, just the data pins are shorted.
2. Nexus 7 OEM MicroUSB cable is nothing special. It is a standard MicroUSB cable.
3. Any USB car/wall charger should charge the Nexus 7.
4. Nexus 7 will charge regardless of whether it displays "AC Charging" or not.
5. The charging rate is dependent on the capacity of the charger and the total charging circuit impedance (lower the impedance the better).
6. Increasing the length of the cable increases the charging circuit impedance and decreases the charging rate.

SOLUTION:
1. Use a high quality, high amperage USB charger.
2. Use a cable with an AWG of (28/24) or lower.
3. Cables longer than 6 feet is not suggested regardless of lower AWG as the connectors itself (especially at the MicroUSB end) will be the bulk of the impedance for that cable.
4. If you desire to have "AC Charging" be displayed on your Nexus 7, short the data wires/pins. Remember, this has no effect on the charging rate.
5. If you plan to modify the charger, take a resistance measurement of the data pins first (unplugged), any readings other than 0 ohms or infinity (open or not connected), you will need to isolate the data pins from the charging circuit prior to shorting. If you do not, you risk damaging the charger and/or your precious Nexus 7.
6. If you plan to modify the cable, short the data wires at the MicroUSB end and leave the data wires open or not connected at the charger end. Use heat shrink to insulate the exposed conductor of the data wires.
7. Make sure the MicroUSB connector end is about 6.0 mm in length.

I don't think any kernel tweak will make a difference. Note the OEM wall charger results in the xda thread - it doesn't actually output 2.1A at 5V... Also note that if you're like me running stock android, we have no way to know the mA output. The Widget only "estimates" based on battery capacity, etc. Someone needs to have either CM10 installed (which modifies the kernel and outputs actual mA values for the apps) or a test rig.
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Old 01-13-2013, 01:56 PM   #254
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i'm down to about 41% battery after 3 days and about 200 miles.

i read the same article that you've copied/pasted zedix.

definitely need a better solution than the one that we have. maybe wire in a small 100W 12VDC to 115VAC inverter and use the stock wall plug? seems silly but I don't know what else to do.

Last edited by sabregen; 01-13-2013 at 02:05 PM.
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Old 01-13-2013, 02:14 PM   #255
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Originally Posted by sabregen View Post
i'm down to about 41% battery after 3 days and about 200 miles.

i read the same article that you've copied/pasted zedix.

definitely need a better solution than the one that we have. maybe wire in a small 100W 12VDC to 115VAC inverter and use the stock wall plug? seems silly but I don't know what else to do.
That seems pretty drastic!

I'll do some more testing with the 3A adapter this week and see how it performs.
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Old 01-13-2013, 02:59 PM   #256
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most of the time the battery monitor is reporting "charging" but at 0mA. sometimes it's ~-50mA. It has spiked to ~-1300mA a few times though. It shows charging, but it's never +mA. Always -mA.
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Old 01-13-2013, 11:16 PM   #257
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Quote:
Originally Posted by zedix View Post
CONCLUSION:
1. Nexus 7 OEM charger is nothing special, just the data pins are shorted.
2. Nexus 7 OEM MicroUSB cable is nothing special. It is a standard MicroUSB cable.
3. Any USB car/wall charger should charge the Nexus 7.
4. Nexus 7 will charge regardless of whether it displays "AC Charging" or not.
5. The charging rate is dependent on the capacity of the charger and the total charging circuit impedance (lower the impedance the better).
6. Increasing the length of the cable increases the charging circuit impedance and decreases the charging rate.

SOLUTION:
1. Use a high quality, high amperage USB charger.
2. Use a cable with an AWG of (28/24) or lower.
3. Cables longer than 6 feet is not suggested regardless of lower AWG as the connectors itself (especially at the MicroUSB end) will be the bulk of the impedance for that cable.
4. If you desire to have "AC Charging" be displayed on your Nexus 7, short the data wires/pins. Remember, this has no effect on the charging rate.
5. If you plan to modify the charger, take a resistance measurement of the data pins first (unplugged), any readings other than 0 ohms or infinity (open or not connected), you will need to isolate the data pins from the charging circuit prior to shorting. If you do not, you risk damaging the charger and/or your precious Nexus 7.
6. If you plan to modify the cable, short the data wires at the MicroUSB end and leave the data wires open or not connected at the charger end. Use heat shrink to insulate the exposed conductor of the data wires.
7. Make sure the MicroUSB connector end is about 6.0 mm in length.

I don't think any kernel tweak will make a difference. Note the OEM wall charger results in the xda thread - it doesn't actually output 2.1A at 5V... Also note that if you're like me running stock android, we have no way to know the mA output. The Widget only "estimates" based on battery capacity, etc. Someone needs to have either CM10 installed (which modifies the kernel and outputs actual mA values for the apps) or a test rig.
I am on CM 10.1, i'll make note of accurate readings. But under heavy usage, seems like it only charges at ~300mA
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Old 01-14-2013, 11:01 AM   #258
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Quote:
Originally Posted by Rescuer View Post
sigh, this is not what i want to hear
i'm waiting to see an effective way to control the tracks via the aswc before i do anything

did anybody research using arduino that i mentioned before?
the Axxess ASWC module will allow track changing just fine if manually programmed. that isn't the issue. the issue (for me) is the crappy audio between the Nexus 7 and the JVC HU. hisses/pops/drops. it's likely more of a HU issue than anything else. regardless, the AWSC is not to blame.

i havent' looked into the arduino idea yet. i have a few fitment issues and the charging issue to resolve first. down to 35% battery this morning.

Last edited by sabregen; 01-14-2013 at 11:08 AM.
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Old 01-14-2013, 11:02 AM   #259
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Quote:
Originally Posted by onsit View Post
I am on CM 10.1, i'll make note of accurate readings. But under heavy usage, seems like it only charges at ~300mA
you're getting a positive charge?

i hate you

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Old 01-14-2013, 11:13 AM   #260
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Quote:
Originally Posted by sabregen View Post
you're getting a positive charge?

i hate you

I'm getting a positive charge too from the CPT adapter. Drove to work this morning (~30 minutes) and tablet stayed at 100%.

What's your 12v to 5v? Also check the length of the micro-USB cable that plugs in the tablet, I heard some of the cheaper brands of micro-USB cables have a shorter connector which can cause these issues with the N7.
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Old 01-14-2013, 11:30 AM   #261
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Quote:
Originally Posted by zedix View Post
I'm getting a positive charge too from the CPT adapter. Drove to work this morning (~30 minutes) and tablet stayed at 100%.

What's your 12v to 5v?
I'm assuming you're asking what the actual voltage is measuring at, and at what amperage? I do not yet know. I am using the CPT adapter as well, here:

http://www.amazon.com/gp/product/B008HZVH6G/ref=ox_sc_act_title_4?ie=UTF8&smid=A366JJX4Y3BPUI?tag=citofgamonlco-20&tag=53361059562-20
Quote:
Originally Posted by zedix View Post
Also check the length of the micro-USB cable that plugs in the tablet, I heard some of the cheaper brands of micro-USB cables have a shorter connector which can cause these issues with the N7.
I'm using a StarTech Micro USB cable, here: http://www.amazon.com/gp/product/B001AR4NC8/ref=oh_details_o00_s00_i00?tag=53361059562-20
3ft version
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Old 01-14-2013, 02:38 PM   #262
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Can't wait for the JDM AV panel to come in and clean it up, also installed a Matte screen protector to help prevent against glare and finger prints
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Old 01-14-2013, 03:18 PM   #263
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onsit/zedix, at the top center of the dash trim is yours popped out? I believe that mine is doing this (about 1/4") because the back of the Nexus 7 is meeting up with the top center clip female end (the part where the hole is for the tab...the surrounding plastic there is what i'm referring to) i originally thought that the horizontal aluminum brace was causing it, but i removed that and it still does it. it seems like if i ground it down i wouldn't have this issue... but then it potentially would not clip in at this one position.

onsit - any charging issues for you?
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Old 01-14-2013, 03:29 PM   #264
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Quote:
Originally Posted by sabregen View Post
onsit/zedix, at the top center of the dash trim is yours popped out? I believe that mine is doing this (about 1/4") because the back of the Nexus 7 is meeting up with the top center clip female end (the part where the hole is for the tab...the surrounding plastic there is what i'm referring to) i originally thought that the horizontal aluminum brace was causing it, but i removed that and it still does it. it seems like if i ground it down i wouldn't have this issue... but then it potentially would not clip in at this one position
Yes, I shaved down that plastic clip about 1/8-1/4 inch to allow the tablet to sit properly. The clip no longer "clips at that position", but it does not impact the stability or snugness of the bezel.
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Old 01-14-2013, 03:58 PM   #265
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Quote:
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I don't see it in these pics, but these are of the US version, not the JDM version. So did you not have to do it on the old dash piece, but only on the new one?
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Old 01-14-2013, 04:00 PM   #266
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The part I shaved is not on the bezel, but inside the dash itself.

You can see it in the picture below:
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Old 01-14-2013, 04:10 PM   #267
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eureka! i thought i was losing my mind. i totally missed the slightly deformed lip in that picture that indicated it had been shaved. that makes waaay more sense.

guess i know what i'm doing tonight.

can the two of you confirm that you're using the same CPT charger that I am? where did you guys get your right angle cables?
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Old 01-14-2013, 06:04 PM   #268
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Originally Posted by sabregen View Post
eureka! i thought i was losing my mind. i totally missed the slightly deformed lip in that picture that indicated it had been shaved. that makes waaay more sense.

guess i know what i'm doing tonight.

can the two of you confirm that you're using the same CPT charger that I am? where did you guys get your right angle cables?
+1 on cable source
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Old 01-14-2013, 07:17 PM   #269
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chopped the dash. test fit time
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Old 01-14-2013, 07:24 PM   #270
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well that part worked out just fine. the part i'm having issue with now is getting the Nexus 7 flush at the bottom of the new dash piece. it's sitting 1/4" back due to the clips ob the actual vents themselves, not the dash piece, on the far left and far right (not the middle two) being in the way. going to sand them down.
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Old 01-14-2013, 07:43 PM   #271
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shaving off the top outer vent clips gets the Nexus 7 butted up to the back of the dash piece... but there's nothign holding it there.

how are you guys getting the bottom o the Nexus 7 screen to stay butted up against the back of the dash piece?

also, Plasti-Dip may need to get peeled off of the dash. it looks great for 3 days, then it becomes a dust magnet. might need to peel and paint.
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Old 01-14-2013, 10:00 PM   #272
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Plasti-Dip may need to get peeled off of the dash. it looks great for 3 days, then it becomes a dust magnet. might need to peel and paint.
I've heard that as well. I thought about doing the trim inside with dip, but ended up not going that way because of the way that plastidip attracts dust.

You have pics of the interior after it was freshly done?
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Old 01-14-2013, 11:34 PM   #273
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Quote:
Originally Posted by sabregen View Post
shaving off the top outer vent clips gets the Nexus 7 butted up to the back of the dash piece... but there's nothign holding it there.

how are you guys getting the bottom o the Nexus 7 screen to stay butted up against the back of the dash piece?

also, Plasti-Dip may need to get peeled off of the dash. it looks great for 3 days, then it becomes a dust magnet. might need to peel and paint.
I flipped my headunit veritcally so its ticked in the back,

Then I created a double cross bracket, with 4 pieces of cork a rough sketch..

......iii.......iii......
......iii.......iii......
.==||====||==.
......iii.......iii......
......iii.......iii......

Ignore the dots, those are meant for white space.

If that makes sense.. this allows for a very flush finish.

---

If someone made a custom fiberglass piece to hold it in place.... id pay cash money.
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Old 01-14-2013, 11:48 PM   #274
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a picture is worth a thousand words on that one onsit.

i think i see what you did, though. you created two brackets in both of the positions where the stock HU bolted in? and 2 pieces of cork per bracket?

i've never done any fiberglass work, but from the ipad mini thread, i have a general idea of how the process works. i don't know that i'd be all that good at it without removing that entire dash piece though, so that i can see what the backside looks like. that might be more work than i am comfortable in doing, however.
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Old 01-14-2013, 11:48 PM   #275
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I've heard that as well. I thought about doing the trim inside with dip, but ended up not going that way because of the way that plastidip attracts dust.

You have pics of the interior after it was freshly done?
best i can do. picture is with flash so immediatley after it was done, i wiped it down. that was 3 days ago. today it looks like that to my eyes. i don't even want to see what a flash photo would look like at this moment.
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