yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] typos1:
My slight mistake there - I do realise the MCU doesnt do all the processing and that it sends some stuff to the MTCcanbus app, mainly down to the app's existence and that its already been discussed that the MCU is Intel8051 based and doesnt have the power. This means that the Android side of the HU does do CAN Bus processing, the MCU CAN Bus settings are clearly for the MCU, which then passes things to Android, but I m talking here about stuff like HVAC, door open, trip computer info, time/date etc, not other functions like reverse, park brake etc that the decoder sends to the analogue inputs of the HU. I ve seen pictures of some units where the CAN Bus lines bypass the adapter altogether and go straight to the HU, but others that go via the adapter. Some one has also previously confirmed that the HU has CAN Tx/High and Rx/Low wires that can receive info. Not wishing to argue, just to get at the truth.

I do remember the post where someone decoded the MCU, pm the poster and ask how they did it ?

---------- Post added at 09:41 PM ---------- Previous post was at 09:32 PM ----------

Have we not discussed this before, or was it with someone else ? I m running all speakers and a sub on a factory external amp (without using the sub out, just 4 RCAs, the amp separates things itself), my sub sounds fine (enhanced bass with some bass still coming through the speakers), rather than a boy racer massive pounding boom box sound. I think this is how factory set ups are designed to sound, I think if you want real dominating bass you gotta really buy a aftermarket amp, it may be different if there was a separate sub level control as on the AN21-U, but these units lack that.

Who ever I discussed it with before said that the sub out was mono and they were going to take a stereo feed from the rear outputs (it wasnt long ago if it wasnt you, use the thread search to find our convo). Is yours a factory setup ? How does it get its feed ? Speaker outs I guess - some OEM headunits go into a special mode when attached to an OEM amp and send an almost unamplified signal to it, some are more conventional and do it via RCAs. How does yours do it ? Does it have a separate sub channel ?
[MTCB Android Head Units Q&A] ultradj83:
Dears,

newbe question.

I use Torque via Bluetooth OBDII, does adding a can-bus decoder make sense?

What can it be useful for to?

Thanks a lot!
[MTCB Android Head Units Q&A] RyanBRZ:
I do recall someone telling me that they were using the front or rear RCA out, instead of the single sub RCA, to the sub amp in hopes of getting more of a powerful signal to the amp--I'm not sure if this was with you or someone else. I understand not everyone wants the boy racer bass, however I'd like to have the bass if I want it. I have a 12" sundown audio SA12 sub @ 1000x1 and it sounds like a factory 8" in the rear deck or something. I used to be able to make my nose tickle with bass. I rarely play it that loud, but once in a while, depending on the song, I like to have higher bass level. I have a remote gain control mounted in my dash to control it.

My subwoofer setup (amp+sub) is aftermarket. Previous to this Android HU, my factory setup used high level signal going into a MTX Re-Q LOC and it provided clean/powerful bass signal to my amp. With installing the Android HU, the sub signal was fed was using a Y adapter on the single sub out to get a L\R RCA line to the amp. With this, the amp really didn't provide much bass until I was at about 15 volume; the bass it did provide sounds very weak and nothing like it did with my factory radio + LOC. Normally going from a factory+LOC setup to a true line-out you get similar level sound that is cleaner. Here, I am getting worse sound at a lower intensity. My amp gain is set using a multimeter so the gain level was set correctly\equal based on the output of each device.

Since this unit doesn't appear to be capable of sending a clean\powerful signal for whatever reason, I am considering trying both of these and see what works better:

- Using the front\rear RCA outs and bumping the gain up on the amp and\or using bass boost feature on amp.

- Using the MTX Re-Q LOC. This unit is powered (not passive) and has it's own gain control which may allow it to compensate for what the radio is missing.

If this doesn't cut it, I'll buy a 4-channel amp to power my front\rear speakers in hopes that if everything is running off of RCA signal, they will sound equal throughout the volume range. I feel like the volume level is not proportionate to the volume level of the line-outs.
[MTCB Android Head Units Q&A] nuvo84:
Anyone?
[MTCB Android Head Units Q&A] WilliamD314:
Newbie question: MTCCanbus app?

Greetings, I just installed a KD-C0223 Autopumpkin unit, updated MCU to 2.16 and flashed the update for KLD_4.4.4_800x480_141126_rooted_light_reparted_init.d_v4.zip. The unit works great so far: I've got root privileges, updated everything the way I like it. However, now I'm just chasing down small things that are annoying me.

Here's the setup:

VW 2010 Jetta Sportwagen TDI with 8 speakers.

Used Scosche vehicle harness to keep the vehicle harness.

Installed ASWC-1 for steering wheel controls, currently working properly (I have volume+/-, next/prev track through Car Service and XposedMTC).

Factory settings: Canbus set up VW&Skoda (option 1 I believe)

Current issues:

No illumination with headlights/interior.

Does not power off with car off.

I see people mentioning MTCCanbus.apk and an MTCCanbus app, but I cannot find it. I figure getting into the Canbus stuff is going to lead me to some answers, but right now I don't even know how to check if the KD-C0223 is talking to my VW's Canbus system. People mention a way for the headunit to see doors open, etc. Right now, I cannot find any such app that gives me that kind of information. Little help?
[MTCB Android Head Units Q&A] n3m35155:
Hey all, just a quick question.

I'm looking at getting an android HU, and have done a lot of reading, comparing specs and prices, and looking at different places to buy.

I think I've decided on a 7" model HuiFei, but model is listed as kgl-6005.

I've seen no reference to this unit anywhere in this thread.

Here is the link to the HU:

http://m.aliexpress.com/item/32258654818.html

Would love to hear anyone's thoughts on this device..

Thanks
[MTCB Android Head Units Q&A] whbbrasilusa:
how can i instal launcher from jy 4.2.2 on kgl 4.4.4 ?

how can i instal launcher from jy 4.2.2 on kgl 4.4.4 ?​
[MTCB Android Head Units Q&A] whbbrasilusa:
Is there a way to change the launcher?

I personal like the launcher on jy android 4.2.2 (Launcher2mtc.apk). Is there any way? can you custom change it on the upgrade.img? Or how can i do?

THANKS A LOT fOr your WORK
[MTCB Android Head Units Q&A] swanie2000:
Did you ever get this problem sorted out? I also have a JY unit, and the instructions for adding the second microphone are clearly not for this JY unit. It does appear the Bluetooth board is the same, but the main mother board is completely different. After taking my unit apart, and looking at the BTboard, I would also think cutting the MIC+ pin from the BTboard to the main mother board would be a good way to separate the two microphone inputs.

How I understood things is that it is poor practice to have two microphone inputs tied together and then try to use just one microphone, the way these units have done, to feed both circuits. It seems to me that it would be best to separate the Bluetooth card's +MIC input from the rest of the radio. This would leave the original microphone completely intact, and working better since it is only feeding one input, similar to what (tomc99) did. You mentioned the new external microphone didn't work because of the lack of bias. Would it be possible to feed a new bias signal to the new external microphone? There is a VDD pin on the back of the Bluetooth board. Perhaps just a simple bias resistor jumper-ed out to the VDD pin would do the trick?

Swanie
[MTCB Android Head Units Q&A] comptechltd:
Just an FYI, here is a webpage from Pumpkin that shows (albeit not exactly the right way) how to add an external mic on a JY unit. Take it FWIW.

http://www.news.autopumpkin.com/how-to-soldering-your-head-unit-if-your-stereo-have-not-external-microphone-input-like-jy-c0227u/
[MTCB Android Head Units Q&A] tomc99:
Hi,

No, haven't gone any further with resolving the microphone issue as yet.

I'm sure it can be resolved some way, but it's just too big a job to keep installing and pulling out of my car all the time to keep trying at the moment.

I'm sure it will get the better of me and I'll give it another go soon.

Tom.
[MTCB Android Head Units Q&A] ESTIMULO:
I have the same problem
[MTCB Android Head Units Q&A] ultradj83:
Could you try Dailyroad Voyager?
[MTCB Android Head Units Q&A] jkchr1s:
Thank you again everyone for the help. I sent the seller pictures and explained what I did and he agreed they sent the wrong canbus adapter. He is sending a new one, and I asked to get another wiring harness with it since I spliced in the PAC adapter.
[MTCB Android Head Units Q&A] typos1:
It wasnt me who spoke about the sub, it was someone else.

I think setting it up the way it was set up with you OEM HU would be a good idea.

---------- Post added at 12:53 PM ---------- Previous post was at 12:52 PM ----------

Contact your supplier and ask for a replcament, try and find a replacement on the internet, DHGate, Alibaba/aliexpress etc.

---------- Post added at 12:55 PM ---------- Previous post was at 12:53 PM ----------

Have you checked with your supplier that you have the right box ? Have you checked whether your car has CAN Bus or resisteive SWC ?

---------- Post added at 12:58 PM ---------- Previous post was at 12:55 PM ----------

MTCcan bus app runs in the back ground, theres no GUI for it and its also totally irrelevant to your problem, what you need to do is play around with the CAN Bus type settings in factory settings and also experiment with different MCU versions. On KGLs at least, with KK and MCU 1.77 some people have reported dual channel CAN Bus working, which includes things like stuff from the HU on the MFD, door open warnings and HVAC settings shown on the HU.

---------- Post added at 01:00 PM ---------- Previous post was at 12:58 PM ----------

Page wont load properly, but it seems like it may be one of the types in this thread.

---------- Post added at 01:01 PM ---------- Previous post was at 01:00 PM ----------

OBD and CAN Bus are 2 different things.

---------- Post added at 01:02 PM ---------- Previous post was at 01:01 PM ----------

Cool !
[MTCB Android Head Units Q&A] manicuspanicus:
One quick question to whoever knows..... can we update the kernel on these machines? if yes then how? forgive my ignorance.
[MTCB Android Head Units Q&A] ultradj83:
Kernel can be updated with an update.img as any complete firmware, there're some in the repository, but nothing for 4.4.4 .

I'm still searching for a kernel solving 3G problem...
[MTCB Android Head Units Q&A] zorantoma:
JY firmware

Does anyone have JY 4.4.4 firmware dated 8.12.2014 for the 1024x600 screen?
[MTCB Android Head Units Q&A] agentdr8:
Yep, I found what needs to be sent:

Intent intent = new Intent("com.microntek.canbusdisplay");
intent.putExtra("type", "off");
sendBroadcast(intent);

I'll integrate it into the next XMTC release.

That might be a setting in PA. I think there's options for resuming music on launch, on focus, etc.

Should be fine. Externally-powered usb hubs are much better, as the 5V supply for the headunit ports seems to be weak and can barely power 1 device @ 500ma.
[MTCB Android Head Units Q&A] ultradj83:
Dump

Dears,

can anybody gently explain how to dump the whole storage to an update.img?

Searching the web the simplest solution sounds to be Romdump, as describer here.

Anyway I also have RK Tools ready, how can I use it to dump all partitions and merge into a simgle update.img ?

Thanks a lot!
[MTCB Android Head Units Q&A] agentdr8:
Not sure anyone's done this before with these headunits. Might see if [MENTION=853627]coudu[/MENTION] has tried it.

I would think you could use the dump_image binary that he preloaded into his roms, and dump each individual partition that's normally included in an update.img: boot, kernel, recovery, system, misc, oem. Unfortunately, even if you dump the user partition, the default update script doesn't restore that partition, only formats it, so you wouldn't get your user apps/data restored when flashing.

I suppose you could try modifying the update-script and recover-script before packing the image to remove the format DATA: clause (and replace it with a write_image clause), but there's no guarantee it'll work.
[MTCB Android Head Units Q&A] ultradj83:
Well, you're right about the user partition.

Good idea to edit scripts, I just hope anybody expert to confirm this.

About the apps an idea could be to convert them into system apps, this should move them in the system partition, is this correct?

Thanks a lot!
[MTCB Android Head Units Q&A] agentdr8:
Not all apps work when put in /system/app or /system/priv-app. And the system partition isn't usually large enough to hold a bunch of apps. And then there's the issue with updating those apps. I would advise against it.

Best to just try a modified update-script. The worst that could happen is it fails and you have to flash a known-good update.img.
[MTCB Android Head Units Q&A] manicuspanicus:
kernels in the repository? Haven't seen that sorry....
[MTCB Android Head Units Q&A] n3m35155:
Here is a better link...

http://www.aliexpress.com/item/2014...-1-6-GHZ-Two-Double-Din-6-95/32258654818.html
[MTCB Android Head Units Q&A] swanie2000:
Thanks for this link. It appears that they are just attaching a second microphone to the same place the first microphone is connected. Effectively having 2 microphones tied together, and 2 microphone inputs tied together. I would think this would make things worse, not better. Not too surprising this came from autopumpkin, as it seems to be common practice to tie these things together when they are manufacturing the radios.

I agree, it would be a PITA to remove the radio many times to get this sorted out. I currently have not installed the radio yet. I have it powered up on my desk, so I can do all the cool upgrades to it that are found in this thread. I am trying to be proactive on the issues I have read about, and get them sorted out before I take the day to install the radio, front and rear cameras, amps speakers, etc.

A lot of really smart people on this thread. Many thanks to everyone who has helped develop this radio into a must have unit for the car/truck.

After posting this, I realized I was not tied to the poor app that came with the radio. I have solved this problem by using different car DVR software. There are quite a few in the app store, try them out.

I have tried this app, and another called road guard(IIRC).

Both apps will stay on my radio until I get it installed, and then can decide which app I like better.

At least the picture is nice and solid, and doesn't jump around like it used to.
[MTCB Android Head Units Q&A] typos1:
Yes, its a KGL using a faceplate thst I ve only ever seen before on some RoadMaster units, albeit reversed so the buttons are on the right.
[MTCB Android Head Units Q&A] coudu:
We can't not delete/restore data this way on our devices because unlike "normal" rockchip devices they don't read update-script but the update-script is hardcoded in a modified recovery binary (so that it can flash mcu, mcu.cfg, etc...).
[MTCB Android Head Units Q&A] swanie2000:
Agreed, cutting C32 appears to be the correct solution for those people who have the correct mother board. Unfortunately I have the JY unit, and as far as I can tell, from pictures I have seen, the mother boards are very different. It also appears that cutting the MIC+ pin from the motherboard of the JY units does kill the microphone bias. I was just thinking the folks with the JY units could do the modification a bit different, and still have complete separation of the to inputs. All that is needed is a new microphone bias signal, typically 2volts, to power up the new external microphone for the Bluetooth input. I do not have a clear answer for this yet, still researching, but I thought I would add this thought to the thread, as there are many people lurking who are quite talented.

Who knows, there might be a simple solution on the JY board as well, just a different capacitor?

Swanie
[MTCB Android Head Units Q&A] p600:
HuiFei - 2 DIN Pure Android 4.2.2/4.4.2/4.4.4 RK3066 Car Stereo Radio Head Unit

please help me to capture video front car camera ,I've tried many record camera android apps which recorded black screen when I chose front camera ..so if you have app or method to capture video from front car camera please tell me how ..thanks
[MTCB Android Head Units Q&A] dark alex:
It's from Green Point but I confirmed with Keylo it is a HuiFei.

Also there was a WiFi-Network saved called "KGL" :) And Images here are the same with my boards.

It's the One for Audi A3 - sorry don't have the HuiFei Number in my mind right now...

To the reverse-signal:

The CANBOX has a wire (I think it was orange with black stripe) that connects to the "Reverse-In" of the radio. This wire should have 12V (against Ground) in my opion as soon as I am driving backwards - but it hasn't.

When I am driving backwards nothing happens. Neighter lowering of volume (I set up attenuation -10dB) nor displaying the rear view camera.

Also the cable does not carry 12V signal while drving backwards.

I guess it's ansother issue with the CAN-Support...
[MTCB Android Head Units Q&A] pakidermo5000:
Fair enough. Not willing to get into a discussion whether the head unit is part of the car or not.

The way you wrote your previous post made me understand that there would never be any info lost on the dashboard. I just wanted to point out that there can be info lost when you change the head unit. I hope it helped whoever asked that.
[MTCB Android Head Units Q&A] pakidermo5000:
This was a problem I had as well, I also have a Audi A3. I think the problem here is that the CANBUS decoder s*cks or is not meant for my model (I have 8PA). I told that to keylo, did not get anything. The way I solved it was taking a cable from the rear gear light and linking it to the orange-black one of the head unit.

You can do this by taking it from the back lights (a pita because you have to bring it to the fron tof the car), or from the box that there is behind the fuse box (also a pita, but maybe less, although you can break your back while doing it). If you use the cable from the rear light straight (or the one of the fuse box, they are actually the same), it will not work well. YOu will see the image for a while, or when the car is off. But then, if the car is on the image will go away after a few seconds. It iss a known issue, because apparently the 12V from the lights are not that stable. You have to use a relay and a constant 12V (like the one for CD charger). Then, use the rear gear light cable to open the relay for the continuous 12v to turn the reverse mode of the head unit on.
[MTCB Android Head Units Q&A] dark alex:
pakidermo5000, the issue you describe is known and the reason is that the controller for board electronics uses a PWM Signal to fire the light (it's theoretically dimmable).

You would need a Power stabilizer (resistor, diode, capacitor) to stabilize that signal. But I don't have the correct wiring of thos components here atm. That just informative.

But I am still hopin on HuiFei to find out about and fixing it :)

else I am thinking of wiring my ZENEC-Can-Box with the HuiFei-Unit...
[MTCB Android Head Units Q&A] pakidermo5000:
ahh, sh... I made a lot of research on internet and could not find anyting besides the relay solution. It did work for me, just costs around 2eur. and this way I give some use to the spare cable of the CD charger... xDD

The Zenec CanBox could work, it is probably better than the HuiFei, but I am also wondering whether my car sends any signal at all about the rear gear, because the 1DIN radio does not need that info at all, neither does any other part of the car...
[MTCB Android Head Units Q&A] edding7:
Hello, thank for all that info about the rear gear.

Im wondering what will happen with universal Huifei. It is suppose to have a CANBUS decoder to map steering wheel, but, ¿What about rear gear?

Maybe i will need your solution just in case this unit come with the same orange wire, or maybe i need to buy apart a canbus decoder specific for my car.
[MTCB Android Head Units Q&A] getehem:
SWC

An universal model never comes with a canbus. The universal units have two wires key1, key2 for SWC, to connect with the original wires of SWC of the car. The orange wire REVERSE does exist on all the models.
[MTCB Android Head Units Q&A] typos1:
I m sure they would be happy to supply a uiniversal model with canbus, if he asked, its easy enough as the insides are the same.
[MTCB Android Head Units Q&A] getehem:
SWC-CANBUS

Since a canbus is a dialogue interface between the main unit and the car, there is not such thing as an " universal canbus". A canbus has been designed for a specific make and model of car....so, a universal unit with a canbus doesn't make sense.

Only could be possible to use a wiring with canbus for the specific model of your car, with an universal unit . But...if such a wiring does exist, it means that there is also a specific main unit for your dashboard, fitting exactly...then why to use an universal main unit??
[MTCB Android Head Units Q&A] edding7:
Anybody knows how is the signal KEY1 and KEY2 really works? I googled it and i've found that they are analog. What i don't understand now is how being analog they communicate with the head unit. Maybe every button in the wheel produces diferents voltages that the unit read with an A/D and then is needed to map.

¿Does anybody here with universal 2DIN and SWC that needed to use some native app to map the buttons of the SWC?

I've found a Canbus decoder for BMW (it also works for a lot of car brands). It's called CX-401.

It provides analog signals for reverse gear, and a two pin SWC that they called IR. It also have a dip switch to change to different after-market devices (kenwood, Sony, etc.).

Maybe connecting this analog output to KEY1 and KEY2 i could make it work.
[MTCB Android Head Units Q&A] getehem:
SWC-CANBUS

Yes each steering wheel command sends a signal with voltage between 2.5V and 5V . The manual setting of SWC from the unit interface consists to link a specific voltage to a specific command, that's it....
[MTCB Android Head Units Q&A] edding7:
Thank you very much, so the huifei universal 2DIN unit sure it will come with an app to map this voltages to differents keys.

I was searching for my car if a analog signal come in the conector (called quadlock) just in case to don't need a canbus decoder. But i don't have luck: It seems that BMW convert to digital CANBUS before to send it to the radio. Other option is try to intercept this analog signal from the wheel itselfs.. but it's too much work for me to dismount the wheel. I prefer to pay 85€ for a canbus decoder and don't dismount the wheel.

And in the other hand, people like me, will need a gear rear, so canbus it's needed finally.
[MTCB Android Head Units Q&A] dark alex:
It does! My ZE-NC3131D lowered the volume for me to hear PDC when switching to reverse.

And it was only connected via CAN to the car electronics. Not reverse-signal-cable or sth else...

What I would love to know is if I probably could get the zenec interface to dispolay HuiFei's Info in my FIS? Is the protocol between the Units and the CAN Gateway a standard thing? Cause what I have heared is that the HuiFei Units generally support displaying info on CAN-Displays just the A3-CAN-Box doesn't support that...

A question to our Tech-Cracks :)