yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units General] sorinakis:
With a 330uF/25v behind a 1N4001 (both recovered from some old project), I get about 8 seconds of holding the HU on. My problem was that, after turning off the car but leaving the radio on (on ACC), when I wanted to turn the engine on, the HU was shutting-down then coming back.

I think that, for keeping the HU on ~30 seconds, I would go with a 2200uF/25v (be prepared with a 4700uF in case you don't get enough time with the 2200). The HU gets it's main power from BAT+, the ACC+ just goes to a GPIO pin and sends a "soft power" signal, hence you don't get a huge power consumption on that rail.
[MTCB Android Head Units General] NYCAR:
If you are going that route, why not a timer delay with a 555? Please keep in mind that I am just throwing terms around. I did some 555 projects in the past, but nothing that required enough power to run a head unit.

This might be something.

https://www.amazon.com/GERI-Delay-R...rd_wg=sN6Ca&psc=1&refRID=7HA9ZFGPQZ8VSQT19K05
[MTCB Android Head Units General] sorinakis:
in the same line: why not using a PIC and programming the time interval to the second? or why not using an Arduino timer? or a TCO RTC such as DS3231? although valid questions, I see no need for such complication when, as I said before, the power consumption on the ACC+ rail is negligible, so a simple R/C (without external R) would do the job. Of course, any other implementation of any kind of timer will work.
[MTCB Android Head Units General] duiveldoder:
Although I can see how this GERI Delay Relay will work postponing a switch-on, but how will it delay a switch off command?

If it's a signal, it's clear it can do that. But a car unit doesn't work that way (correct me if I'm wrong). It's a +12volt means switching on and once the voltage drops to 0Volt it's going into shutdown/sleep

This GERI catches a 12V signal to switch on and another 12V to switch off. So it just sends the voltage as an impulse, if I got it right? But not that it maintains the voltage over a longer period of time.

So I don't see how it could work with a car unit?

A capacitor indeed can maintain the 12V for a longer period (depending on the capacity and frolyt, elektrolyt, etc.) it will drop eventually to 11 volts.. then 10 volts...

and then a sudden drop to 2 or 1 volts. That's basically how the capacitor works and any voltage over 9.5 or 9.8 the head unit won't consider to shut down.

I know at 8 volts it's shutting down and at 10,5 it won't shut down. Not sure exactly where the exact value is where it will consider shutdown or remain powered.
[MTCB Android Head Units General] NYCAR:
I did a project in the past where;

1) Constant voltage went into a pin

2) Switched voltage went into another pin

3) When the switch at "2" was turned off, there would still be output for a certain period of time, then it turned off.

As for the GERI not being correct; I have no reason to dispute you. I am certainly not an electrical engineer and the project I mentioned above took hours of research on my end because that is not my background at all.

I did see other boards that appear to be exactly what is needed (and cost only two bucks on ebay), but they delay shutoff to a maximum of ten seconds and seem outside the parameters of what OP needs.

As I have proven my knowledge to be well below that of other people on this thread, I'll keep quiet now.
[MTCB Android Head Units General] duiveldoder:
Hi NYCAR,

from your response I figure you understood me saying that I knew how it all works.

I probably didn't write correct what I wanted to ask, because I didn't actually want to say anything but my whole previous response was meant as :"QUESTION"

everything I wrote was meant as a question.. asking like:'does it do this?" or "does it work like that?"

My questions, because on the pictures I can only see a 100uF capacitor. So logically if the 12V on the input size drops, it can maintain 12V on the output only as long as 100uF will last.

Also I don't really get the AC one side and DC other side. In a car I only have DC, at least in my car.

But I doubt there are that many cars that can handle AC as normal car batteries are all DC logically.

You'd first have a DC/AC convertor

But I might just get it all wrong. That's why asking.

But I think for simplicity, the previous answer with the capacitor is the easiest part. logically current only flows through a closed circuit.

So with a diode prevent backwards current, you'll force the full ampere through the HU.

And I found, based on the technical advise from the other poster, this one https://octopart.com/ecr1ept472mff751631-jianghai-24161819

which should be able to keep the unit running for a while. If 330UF keeps the unit running for 7 more seconds, assume 5.

Than 4700 will be at least 71 seconds which is more than my 60seconds which I need as minimum.

Actually the minimum I have with mycartracks is 10 seconds but I always set it to 30 seconds so the unit doesn't think at each stop sign/traffic light, etc

that I am starting a new track. That's why I set it to 30 seconds. So when I switch off the car, I need 30 seconds for the mycartrack to understand the recording must be stopped.

than I need another 2-3 seconds to save the track and another 2-3 seconds to upload online. That's why I consider 60 seconds a safe value and with 71 seconds I'm over that

and that's based on 5 seconds on a 330uF but 330uF actually gives you 7 seconds. So I have more than enough reserves with just a little 2USD piece of hardware :)

As posted, the ACC doesn't really draw much Ampere so any cheap capacitor will do I guess.

But anyway thank you for pointing out the GERI! As I will buy one anyway but for another project of mine for which this device is perfect :)
[MTCB Android Head Units General] NYCAR:
I'm sure you explained correctly. I should have mentioned in my post that I was only stating what I meant as a way to 1) explain what I intended by my initial advice and 2) show my ignorance in electronics to hopefully forgive the fact that I posted a link to a device that you say is completely incorrect for the intended project.
[MTCB Android Head Units General] duiveldoder:
And I want to say that I don't know if it's completely incorrect :)

Just doesn't seem to do what I intend to do. But maybe it does, that's why my questioning.

I studied some more on the device and found now this, at least that's how I assume it to work:

As far as I can tell, on the NO output you always have the DC input. So if it's 12V than it remains 12V.

You switch on 0 Volt, it goes to 0 Volt.

But you have this:'timer running' the moment DC goes to 0V

the relay will switch from the NO to the NC output so you have now 12V on the NC. So for a fraction of a second Voltage will drop to 0V.

That might be short enough for the unit to continue running but it might also be too long. So it might, that the HU still goes into power off.

But even if it's fast enough, assume that it is fast enough relaying, the timer now starts. Meanwhile, the car start is finished and I have +12V on the NO again

but the timer is running. Again a short 0V drop.

It doesn't say anywhere, that it'll now reset the timer so next time I go to 0V on the DC again (stop the car engine) the timer again gives me 30 or more seconds.

So basically, if it does reset the timer when 12+ again is on the ACC then it might work, apart from the short 0V drops during the relay switching.

To overcome the relay switching, I might put a capacitor behind the relay to handle that. But it already has a capacitor on the board, so maybe it's just for that.

But 100uF seems very few to fulfill this function. But 4000uF would be an overkill in this situation.

All in all, it might work. Problem I have with it, is that the manual/description is not conclusive to me and 100uF seems a bit few (I must admit that's just out of my stomach)

because if the relay does it's work in 0,00001 seconds 100uF will be more than enough.

Either way, I won't need a 4700uF or even 10.000uF capacitor with this solution if it resets the timer again and again each time +12V is put on it.

So that's my main question. Will the timer be reset each time +12V is on it?

Since this device is only sold in the USA, I need to know precise functionality before I order it to Europe.

I have to send it to a friend of mine in the USA who always takes care of me for US-Only deliveries and then sends it to me here in Europe.

So it's very important I know exactly what I get when I order it. Not for the money, I have enough of that. But waiting 3-4 weeks for shipments .. I don't like waiting hehehe
[MTCB Android Head Units General] duiveldoder:
I'm wondering how much mA the car radio uses on the ACC?

Pure theoretical the Capacitor of 330uF has 0,0003F at 12V

and F = As/V makes As = F*V = 0.0036

If A is now let's say 20mA then 0,0036 would be enough for 0,18 seconds

if it's 2mA then it would be enough for 1,8 seconds

Above it is said, with 330uF it can keep the 12V on the unit (or 9,5 where it switches off) for 6-7 seconds.

which means the current on the ACC should be around 0,6mA?

Is that correct? (ehm, I know it should be less in reality because Voltage drops while the capacitor is unloading but just assume it keeps up for the sake of easy math, I mean it doesn't have to be exact science here just raw getting close to it)

Than a 22000uF at 12 volts with 0,6mA would be enough for, theoretical 440 seconds = over 6 minutes..

But would the ACC really be 0,6mA? I understand it's just a signal and not really powering the device. But 0,6mA?

seems a bit too few for me.
[MTCB Android Head Units General] SolidusNL:
Wait let me get this straight, you guys are discussing ways of keeping from turning off when you crank the engine?

That's really complicated thinking you're doing in that case.

I'm a car electronics technician, I install all kinds of doodads in cars.

What happens is your head unit has a solid 12v coming in, noted as +30.

It also has a 12v coming in when the key is turned to acc.

The one going to your head unit likely drops when the engine is cranked.

If you want to fix that issue it's simply a matter of running a wire, with a fuse of course, 4A will do, from your car's ignition switch to your head unit.

The ignition switch has 2 'switched' 12v wires coming out, one drops to 0v on crank and the other stays up, tee the wire you're running off that, solder it up and use it to connect to your head unit's 12v switched input.
[MTCB Android Head Units General] llaugerm:
I can say you're the man. That's Genius I never thought of that. It means that the Yellow Constant +12 I should get from the ignition switch the done that does not drop to 0V during starts up.?
[MTCB Android Head Units General] SolidusNL:
Exactly, you connect the one that doesn't drop during cranking to the yellow wire, that usually drops low when cranking. That way the radio starts up as soon as you switch the ACC on, and not after starting the engine.
[MTCB Android Head Units General] Sadece_erhan:
1- i had same issue. Capacitor solve my problem, and will solve yours too
[MTCB Android Head Units General] ozi5783:
I hope this is the right thread to ask... Is it possible to power on the unit without starting the engine or without turning on acc?
[MTCB Android Head Units General] marchnz:
Solved on MTCD by adding internally 4700uf 25v cap to +B 12v and for +12 switched/ACC,

after

zener diode [ACC Detect] adding approx 470uf 16v electrolytic cap.

Your mileage may vary on MTCB, get reverse engineering.... :)
[MTCB Android Head Units General] voldemarz:
Any idea how it is on MTCE units?

I just ordered Dasaita HA2153-MAX6

https://www.aliexpress.com/item/33010915960.html
[MTCB Android Head Units General] marchnz:
The same.
[MTCB Android Head Units General] voldemarz:
Doesn't work. Still reboots when I start the car. It is MTCE_HA_V3.37_1.
[MTCB Android Head Units General] marchnz:
Not keen to share details then?
[MTCB Android Head Units General] voldemarz:
What kind of details? Posted head unit brand, model, mcu. Connected to car without any special tweaks. When start the car it reboots. What more is there to say?
[Xperia Z3 Q&A, Help & Troubleshooting] Omda_Mix:
HI ,,

what is the best and stable nougat rom for Z3 d6633 ? :confused:

regards ,,
[Xperia Z3 Q&A, Help & Troubleshooting] Gustavo RD78:
N developer preview
[Xperia Z3 Q&A, Help & Troubleshooting] maciejbro:
Hello! Where can I find nougat developer preview for d6633? I tried to flash NPD56N, but it was for d6603, and my sim cards was invisible. Could you give me a link for .tft file, please?
[Xperia Z3 Q&A, Help & Troubleshooting] maple_mak:
Developer Preview 4 makes random reboot, don't you know?
[ZTE Blade V8 Pro Questions & Answers] jason79:
Anyone have any luck getting their Blade V8 on the Verizon network?

I've followed this thread and I could only get "Verizon" to pop up on top left then go away, and also I could see a LTE for a few minutes.

https://xdaforums.com/axon-7/help/verizon-compatibility-t3506358
[SuperSU] zeggaisadam:
Hi I have a problem with ROOT

The error message appears as in the pictufor SuperSU

I tried installing an update for SuperSU But still the same problem please help
[Galaxy Tab 3 Q&A, Help & Troubleshooting] Stanwar:
The title say it all. This device needs some attention. We're stuck on kitkat with no possibility to get a higher android version. We'd really love to see a new rom for our device with a decent android version. I want newer Android version mainly because I want to be able to use magisk. And few other applications that are only available on 5+. I'm sure everyone has a reason. So please, any developer interested in this?
[Galaxy Tab 3 Q&A, Help & Troubleshooting] doasdo:
Hey,

I found android 7.1.2 for the sm-t113 and sm-t116 and nu editions. Here it is.

This is the video:

This is the fourm: https://xdaforums.com/gala...

And try to use this: https://drive.google.com/file/d/1zdSrpzAvenQJCK1EPxkCuG4jEjpEoiWR/view

Or use Open Gapps(7.1/arm/pico): https://opengapps.org/
[Galaxy Tab 3 Q&A, Help & Troubleshooting] Captain_cookie_200:
How come it's so smooth on his device? Its laggy and sh.t in my device. It looks like there is no gpu acceleration not even transparency for stuff like satus bar. Once u pull it down its black like what
[Galaxy Tab 3 Q&A, Help & Troubleshooting] Captain_cookie_200:
My model is same as his sm-t113
[Lenovo Yoga Book Guides, News, & Discussion] danjac:
as it is asked quite often, here's how you get ota with a modified stock rom.

For example, ota will fail if you have root (as it changes your boot partition slightly) or if you deleted some preinstalled apps (e.g. chrome browser). OTA script always checks the signatures of your running rom and the ota update. If they don't match, it will fail.

An unlocked bootloader does not prevent ota from working!!!

requirements: a backup of a 'clean' stock rom

So if you want to update perform the following steps (edit: you can find a second and easier method at the end of the post)

1. boot twrp

2. backup everything to be safe (boot, recovery, system, data) if something goes wrong

3. restore 'clean' stock boot partition and recovery partition

(4. if you changed something in 'system' restore system as well)

5. boot tablet

6. download and install ota - it should succeed

7. boot twrp and restore data again if needed

(8. root again with magisk)

good to know:

if you restore partitions, make sure they are from the same build! if not, tablet might not boot or ota will fail again.

if you are rooted, you can use the the backup of boot created by the magisk script (-->/data/stock_boot_<sha1>.img.gz)

if you don't have a backup, try to get hands on a stock rom and flash the required partitions manually (e.g. fastboot flash boot.img etc..)

good luck

(if anyone knows a better way, let me know and i will add it here)

edit: [MENTION=6623360]MarkAllen[/MENTION] provided this method which is far more simple (but which unfortunately has never worked for me by now).

1) Boot TWRP and install "Magisk Uninstaller"

2) Clear cache and Dalvik cache in TWRP then reboot

3) Uninstall phh's SuperUser and Magisk Manager

4) Start OTA update and follow instructions

This completed no problem for myself and then I just re-rooted again

5) Boot TWRP and installed Magisk 12

6) Clear cache and Dalvik cache then reboot

7) Install phh's SuperUser from the play store

8) Launch SuperUser and Magisk manager each one time (for some reason root checker claimed root was not installed properly until I did this)

9) Check root using root checker
[Lenovo Yoga Book Guides, News, & Discussion] MarkAllen:
I was rooted from the last February security update. I was under the impression I would be able to allow the April security update to download then copy it on the root of my internal or sdcard storage then boot to normal recovery to install. I've done this with other devices I own (Shield Tablet and TV) and seemed to work fine for them. You would just re-root later when done. Anyway as you noted this didn't work on the Yoga Book though due to changes rooting makes on this device.

How I ended up doing this was a bit different then you describe, but meets the same end as your instructions I guess? All I had done was uninstalled root, ran OTA update (which worked this time), then rooted again and it worked great.

1) Boot TWRP and install "Magisk Uninstaller"

2) Clear cache and Dalvik cache in TWRP then reboot

3) Uninstall phh's SuperUser and Magisk Manager

4) Start OTA update and follow instructions

This completed no problem for myself and then I just re-rooted again

5) Boot TWRP and installed Magisk 12

6) Clear cache and Dalvik cache then reboot

7) Install phh's SuperUser and Magisk manager from the play store

8) Launch SuperUser and Magisk manager each one time (for some reason root checker claimed root was not installed properly until I did this)

9) Check root using root checker
[Lenovo Yoga Book Guides, News, & Discussion] danjac:
great to hear...

using the uninstaller alone has never worked for me...it always aborts...sometimes it complains that some files are missing or were changed, the recovery partition doesn't match the expected one, etc...

mostly i can't remember which things i've done to the rom/system.

but again, good to know that magisk uninstaller works, it definitely is less complicated and time consuming.
[Samsung Galaxy S7 Questions and Answers] Detonatte:
Exist External Sd Card Write Permission for Nougat?
[Samsung Galaxy S7 Questions and Answers] DE SEXIEST:
Nope

---------- Post added at 09:54 AM ---------- Previous post was at 09:53 AM ----------

Apps Developers Need To Implement It In Their Apps
[Touch CDMA General] No1ustad:
I did a search, but it kept pointing my to IMSMS which is not what I want.....

Is there any [free] way to export the palmMsgV001 file to csv or any other format viewable on a desktop comp?

any help would be awesome
[Moto G Q&A, Help & Troubleshooting] portagira:
Which is the best rom based on KitKat for falcon?
[Moto G Q&A, Help & Troubleshooting] Deleted member 6856899:
KitKat is in a died stage of development, the best rom you can try is my Cyanogenmod 11, clean, fast, without "screen flickering" bug, battery friendly

https://xdaforums.com/moto-g/development/rom-cyanogenmod-11-4-4-kernel-fixed-t3431146

another my rom is the Stockkat:

https://xdaforums.com/moto-g/development/rom-stockkat-4-4-4-optimized-screen-t3416130

or my SpeedMod (slimkat based):

https://xdaforums.com/moto-g/development/rom-speedmod-slimkat-based-lollipop-t3430480

Another good rom (search on xda) is the StockLite

there are a lot of good kitkat roms
[Huawei P8 Questions & Answers] vincentpan55:
I have rooted my huawei P8 following the instructions by Tecalote. His huawei SRKT tool is great! Yet I now tried quite a few call recording apps, and found none of them working on my P8.

Could anybody give me some suggestions? I've tried killer mobile and ACR and boldbeast and etc.

Thanks！
[Huawei P8 Questions & Answers] potworny:
https://play.google.com/store/apps/details?id=cc.automatic.callrecorder.pro this one works for me
[Huawei P9 Lite Questions & Answers] aalmeida1972:
Hi,

I have the RC3 rom installed on my L31 and i can't reach to do a clean install (revert to Marshamalow and then upgrade to Nougat).

I am stucked in a bootloop :(

Can someone help me with this?

Thanks in advance.
[Huawei P9 Lite Questions & Answers] gtdaniel:
You are in RC3 rom or in bootloop?
[Huawei P9 Lite Questions & Answers] aalmeida1972:
Now, i am in a bootloop.
[Huawei P9 Lite Questions & Answers] gtdaniel:
At 3 key combination restart what is going on? Start erecovery?
[Huawei P9 Lite Questions & Answers] aalmeida1972:
It's stuck on Huawei logo.
[Huawei P9 Lite Questions & Answers] gtdaniel:
This is not bootloop... Is nothing to boot...

If you can not force phone in bootloader mode, to flash some recovery+system, your last chance is DC Phoenix...
[Huawei P9 Lite Questions & Answers] aalmeida1972:
Sorry, what i wanted to say, is this:

When it powers on, i get the Huawei logo, but a few seconds later it powers off and restart.... so on, and on. It keeps repeating this cycle.
[Huawei P9 Lite Questions & Answers] Anonda:
Flash stock boot.IMG and stock recovery.img by custom recovery or fastboot method.

Then use dload 3 button method. Power off. Go to stock recovery, do factory reset.
[Huawei P9 Lite Questions & Answers] gtdaniel:
With USB cable connected on phone and PC and with Vol-+Power enter in bootloader mode?
[Huawei P9 Lite Questions & Answers] aalmeida1972:
Problem solved.

Thanks
[Huawei P9 Lite Questions & Answers] afiqz1996:
how do you solved it? im facing the same problem. i cant boot from power + vol up + vol down. now im stuck at RR Rom with TWRP installed. i tried everything , restore from TWRP doesnt work.
[Android Q&A, Help & Troubleshooting] Jan Philipp:
Hello, Folks!

I have a new phone and I wondered how long other people wait before they root their new devices.

My "old" LG G2 is completely modified but it took 6 month before I rooted it. Don't know why. Doesn't matter.

Now I have a Huawei P9 and I like this phone. It has an "idiot-warranty" for dropping the phone in the first 3 month. One more reason to wait.

So, how long do you wait? (And why?)

Greetings, Jan
[LG G5 Questions & Answers] leijonasisu:
Hey everyone. Please don't flame and ask me to just 'test' Roms etc. I've been doing that for months. Tried vanilla stock, resurrection remix, cyanogen etc.

I need a Rom that isn't absolutely plastered with 'branding' and stuff from the creator and doesn't have the settings menus warped or other nonsense baked into it.

But that still allows me to use both cameras and doesn't drain my battery in only 4 hours.

I just got a new battery today and my phone is still draining in just a few hours with the screen brightness at 50%. I've got all of my settings turned off, BT, GPS etc. and I don't even have that many apps installed.

So it's got to be the rom because I used to get 1½ days out of this thing.

I really like AOSP roms, but I just don't like not being able to use both the cameras to their full potential.

Any ideas?
[LG G5 Questions & Answers] Gemma34:
You can check out Fulmics ROM 2.0 or or Genisys 2.0. My friends use those and they haven't complained about it.
[LG G5 Questions & Answers] Scostam:
I installed RR 6.1.0 from NextDroid. The battery performance improved, it now charges faster and lasts longer. However the wide-angle camera doesn't work. ?*♂️
[Samsung Galaxy S7 Edge Questions and Answers] Haskren:
A basic function of my iphone is to select a handful of picture and attached them directly as reduced file sizes.

I haven't found a way to do this on my S7e. Sure, I can use "Send Reduced", but it only allows me to attach one picture at a time - so not really a solution.
[Samsung Galaxy S7 Edge Questions and Answers] Haskren:
anyone?
[Samsung Galaxy S7 Edge Questions and Answers] Pet1981:
In the standard Mail app when you choose "attach" you can choose "RESIZE IMAGE". When you push it you have the options "Large (70%)" "Medium (30%)" and "Small (10%).

When the pic was already resized you haven't this option. If you take pictures with 9MP or 12MP you can do it.