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I bought a unit recently identified as Android 8802 https://www.ebay.com/itm/7-2-Din-Qu...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2648 . It only has a Key 1 wire. My car, '03 Volvo XC70, has 2 CANBUS wires in the harness, CanL, CanH. I did some reading and found that sometimes you can ground 1 of the wires and just use the other. I tried this both ways, ground L and connect H to Key 1 and, ground H and connect L to Key 1.
One of those combinations was BAD, no lights on dash and major oh sh!# moment. One of the combinations let me set the buttons for vol up/down and track forward/back BUT, after setting the last button and exiting the setup software whatever was the last function I setup would act like I was pressing the button continuously. Like if it was vol up it would just keep going up, up, up, up, up etc.
Has anyone else dealt with a HU that just had Key 1 and 2 BUS lines?
I think you would want/need a canbus adapter. I found this: https://volvoforums.com/forum/audio...ermarket-steering-wheel-radio-controls-57081/
Thanks for the link/info. I'm seeing a lot of "if" and "maybe" and the like. Nothing that is identified as The solution. I'd much rather try to understand how my unit, which has only 1 SWC wire (Key 1) is meant to be connected to cars to make it work.
I was thinking about joining both CanL and CanH to the Key 1 wire. I'm no EE but my assumption is that if they are both putting out variable voltages and resistances (one "low" and one "high") that combining them would just be sending the entire range of signals through the Key 1 wire to my HU for decoding by the on board s/w. Anyone see a red flag on that?
treojoew said:
Thanks for the link/info. I'm seeing a lot of "if" and "maybe" and the like. Nothing that is identified as The solution. I'd much rather try to understand how my unit, which has only 1 SWC wire (Key 1) is meant to be connected to cars to make it work.
I was thinking about joining both CanL and CanH to the Key 1 wire. I'm no EE but my assumption is that if they are both putting out variable voltages and resistances (one "low" and one "high") that combining them would just be sending the entire range of signals through the Key 1 wire to my HU for decoding by the on board s/w. Anyone see a red flag on that?
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Generally canbus is sending out a digital signal. Headunits are expecting an analogue voltage or resistance between key1 and ground. A key2 wire just allows a second analogue signal to be used in addition (I use a key1 +ground and key2+ground in our mazda5 as it has *resistive* steering wheel controls with two different paths - one for most controls and one for just the "phone" button which in the oem set-up only routes to the bluetooth box). I am surprised that canbus signals on their own can ever function on a headnit that is expecting resistive/analogue voltage inputs. I would never attempt to hook it up, but instead would source a canbus adapter that will convert the digital signal to an analogue output. This is exactly what I have on our Saab 9-3: canbus to Connects2 adapter to chinese head unit, where the connects2 box output is connected to the headunit key1 and ground. It is to note that some chinese headunits come with a canbus box built-in, but for a specific vehicle, and in that case the canbus wires would be hooked up directly.
Ahh. That is a huge distinction that I had not heard anywhere else. The fact that the CanBus is digital and the HU is analog. Had you not stated that you also have a Chinese HU (assuming Android) I would have thought you were referring a traditional HU. Why is the Android unit not designed for the digital signal?
Are you certain about all of this? Is this a true statement, "The Chinese Android HU's are designed only to connect to SWC that are analog, NOT the digital CanBus lines"?
treojoew said:
Ahh. That is a huge distinction that I had not heard anywhere else. The fact that the CanBus is digital and the HU is analog. Had you not stated that you also have a Chinese HU (assuming Android) I would have thought you were referring a traditional HU. Why is the Android unit not designed for the digital signal?
Are you certain about all of this? Is this a true statement, "The Chinese Android HU's are designed only to connect to SWC that are analog, NOT the digital CanBus lines"?
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As I stated above vehicle specific Chinese Android headunits will come with a canbus adapter (if required). All universal head units that I have seen (meaning Android Chinese head units) are expecting analog inputs. If you look at the advertising for joying or others on aliexpress it explicitly states that you need a canbus adpater if your vehicle outputs (in the harness for the radio) canbus signals. Be aware that the canbus signals that transmit steering wheel control information are not standard, each vehicle manufacturer is free to use whatever signal chain they want for the controls as they are also the "supplier" of the radio. That is why they have vehicle specific canbus adpaters (where the aftermarket canbus adpater manufacturer has "sniffed" that vehicles canbus lines to learn the codes), or universal ones that either learn thru button presses and/or are coded with multiple vehicles. I advise you to contact axxess (if you are in N/A) or connects2 (if you are in the EU) and talk to them about what you need. I have been in contact with both those companies over the years and both should be quite helpful. PAC is another option, but I have no experience with them.
---edit---
All that being said I did a little more googling on your vehicle and it seems it is a problematic one - connects2 shows using the axxess adapter, but only for later years than yours and axxess states that they have no info on your model year. All the more reason to contact axxess, but in the link in my first response didn't someone get your it working with your vehicle and year?
---more edit---
Reading thru that linked page it is definitely a problematic vehicle - it seems like this may be your best bet but more research is definitely required: https://www.crutchfield.com/p_249SWRVL54/CRUX-SWRVL-54-Wiring-Interface.html
Great info. Thanks for your time and your advice.
I am struggling with getting swc on my android install. Since I am installing this in a Maserati there er no available can bus swc unit to buy. I have read out the cantus on the Maserati so I know the code for each switch, but I have not been able to get information on how the input on the head unit (joying auto) there are to pin on the main connector dedicated for the swc but I believe it is a 2 way serial transmission. I measure 3.3V on both but one in with a weak pull up so it must be the rx input and the other to. But what baud rate and protocol? Can anybody help me with this.
Will it also be possible to transmit the radio station info to the cars dash display via this output.
Franzbetula said:
I am struggling with getting swc on my android install. Since I am installing this in a Maserati there er no available can bus swc unit to buy. I have read out the cantus on the Maserati so I know the code for each switch, but I have not been able to get information on how the input on the head unit (joying auto) there are to pin on the main connector dedicated for the swc but I believe it is a 2 way serial transmission. I measure 3.3V on both but one in with a weak pull up so it must be the rx input and the other to. But what baud rate and protocol? Can anybody help me with this.
Will it also be possible to transmit the radio station info to the cars dash display via this output.
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I'm also looking for information on the baud rate and protocol. Did you find anything?
Android upgrade.
O.i.D said:
I'm also looking for information on the baud rate and protocol. Did you find anything?
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Yes and NO. The andriod radio that I was trying to communicate with was modified (by the supplier) so that the SWC input was changed to a serial communication. Normal is Resistive or voltage input.
When I was told what to modify to get the radio back to standard SWC, then I was able to control the the radio with a DAC output on my can-module, but this limits the functions to only standard SWC functions. The radio did have apps that could get information from the car like fuel consumption, trip control ect. But the supplier would not give me the protocol for the serial com. So I was not able to make the can translation for the Maserati.
So if I want to have these features then I need to reverse engineer it.
The radio supplier did supply a Can converter that fits a Citroen, so I will need to make the install on the Citroen and then read out all the serial data that the can converter makes in use. And that is not a task that I want to spend time on now that I have got the radio to work with the SWC.
Franzbetula said:
Yes and NO. The andriod radio that I was trying to communicate with was modified (by the supplier) so that the SWC input was changed to a serial communication. Normal is Resistive or voltage input.
When I was told what to modify to get the radio back to standard SWC, then I was able to control the the radio with a DAC output on my can-module, but this limits the functions to only standard SWC functions. The radio did have apps that could get information from the car like fuel consumption, trip control ect. But the supplier would not give me the protocol for the serial com. So I was not able to make the can translation for the Maserati.
So if I want to have these features then I need to reverse engineer it.
The radio supplier did supply a Can converter that fits a Citroen, so I will need to make the install on the Citroen and then read out all the serial data that the can converter makes in use. And that is not a task that I want to spend time on now that I have got the radio to work with the SWC.
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Thanks for the info, really curios to know that the design allows for both analog and digital control with the proper changes.
Regarding the can converter, are you in Europe (I'm going to guess you are as you mention Maserati and Citroen ) and willing to sell the converter? I'm looking to buy one to test and debug so I can find out how the information is sent to the head unit.
Android upgrade.
O.i.D said:
Thanks for the info, really curios to know that the design allows for both analog and digital control with the proper changes.
Regarding the can converter, are you in Europe (I'm going to guess you are as you mention Maserati and Citroen ) and willing to sell the converter? I'm looking to buy one to test and debug so I can find out how the information is sent to the head unit.
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If you want to analyze the serial transmission between the andriod radio and the can-converter, then I suggest that you order a headunit and the additional can-bus module for a Citroen C5. Go to www.Joyingauto.com
They sell this Android radio with additional features that link climate display. see link https://www.youtube.com/watch?v=X40sgh1lxao
BTW they also have these unit for VW with the same features.
Franzbetula said:
If you want to analyze the serial transmission between the andriod radio and the can-converter, then I suggest that you order a headunit and the additional can-bus module for a Citroen C5. Go to www.Joyingauto.com
They sell this Android radio with additional features that link climate display. see link https://www.youtube.com/watch?v=X40sgh1lxao
BTW they also have these unit for VW with the same features.
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Thanks for the info, I already have the HU and so does my friend. I've made some progress in my thread so I will keep trying to find a solution!
Looking for android head units with the built in frequency crossovers for both subs and front/rear speakers. I see some of the others listed with things like "bass filters", but it's hard to see if it's merely a coarse low pass filter for bass only, or if I can set both low and high pass filters for the front/rear channels as well.
Currently running Joying units in two vehicles, and really like the fine adjustment of frequencies on the sub and F/R outputs, and being able to choose different frequencies for the front and rear rather than preset options...as in being only able to choose something like 50hz, 80hz, 120hz and having that setting affect both the front and rear. In my truck, I currently have the fronts set to a 120hz high pass, and the rears set to a 140hz high pass. I've read where something like the ATOTO only offers thee specific frequency options, and the highest would still cause distortion with my rear speakers.
Is Joying still the only game in town offering the fine adjustment like this? I know external processors will give me a better sound, but I'm not an audiophile, and not running high end speakers/amps, so what the Joying does is good enough for me. But I do want to keep the ability to set specific frequencies.
Not necessarily unhappy with the Joying stuff, just looking to see what else is out there before buying.
Has anyone been able to get a full data sheet for the TDA7708 radio chip used in many of these units?
I found one for the TEF6686 but all I can find for the TDA7708 is basically a 7 or 9 page PDF which is just a sales brochure and has no real technical information.
Has anyone successfully reverse engineered the radio app that is common to many of these units? Does it exist as a separate part which could be modified and reloaded or is it a hard coded part of the firmware?
Reason for the inquiry is that the AM radio frequency response is absolutely disgusting on the units I have, seeming to have a bandwidth of less than 4kHz. The TEF6686 data shows it can be set for bandwidths up to 8kHz in steps of 0.1kHz, if the TDA7708 has similar capability it would be a huge improvement albeit still not good quality, it would just need someone to find the command sent to the chip and edit it to program the widest available bandwidth each time AM is selected.
It may not be commonly known but here in NZ and also in Australia, maybe elsewhere too the quality of the AM transmissions is very good and when received by a properly designed wideband receiver can be almost as good as FM.
The other changes in the app that would be really good are to remove the autoscan function which is easily activated by accident instantly wiping out all your preset stations and to hide the functions we don't use i.e AF, PTY, etc. We need only RDS.
Hi, install a different style of radio like radioNAVI app from google playstore. But first use default one, FREE version just to know if device supports. Other one cost some money.
Anton, no offense intended to you and I appreciate that English may not be your first language but please read what I ask and try to actually answer me, otherwise leave it for others to answer.
I did not ask for any other app, I asked whether any of the software geniuses here had been able to achieve anything with the existing radio app which is otherwise very good, also I asked for technical information on the TDA7708 to confirm whether it can be set up the same way that the TEF6686 can, you seem to have missed all of that.
Look... I only meant to help with radio app. You told that is disgusting, so I provided help in that area. I proposed app that maybe will suit you needs.
Let's face it - I know and I've read what it says, but the things you ask for can only be done by a software vendor or dealer. "Reverse Engineering"? No, and I don't think anyone is going to do it on their own.
On the other hand, this can help you ... Studying the software on my radio.app I noticed that each firmware from different vendors has the same app only changing the UI (interface). As a rule, you should ask the vendor if he has a similar application or find it on the Google Store, since it is impossible to remake the original radio app, you can just replace it with another version of the firmware and with it the radio app.
If you can't find a solution buy a new radio chip for the unit. You mentioned some frequencies there yourself and that you are not happy with it. Radio chips can be replaced on some units. Just search on Ali Express and you will find it. The newer the better the reception frequency, the rest can be adjusted in the factory settings of the unit. You have there settings for IC - radio chip, interval size 4M , 9.12 or 12M, rds system to adjust, etc.
Play with it!
Thanks for understanding and yes it is not my native language but I try give best translation from my language and from my head not from Google translator!
Regards.
OK Anton, I see what's happening is that the translator is not coping with what I write so you're not really seeing what I say accurately.
I wish there was a way to read that Russian forum but Google translate seems to work only on the first page of any thread then it's back to Russian for the rest of the pages.
I think I'll just back out and live with the small issues as the units are really very good.
By the way do you know if they are really made by Alps or are they Chinese fakes labelled as Alps?
Many years ago I used to repair valve operated black-and-white television sets, Alps components were used in some of them and were of very good quality. Later Alps formed a subsidiary called Alpine Electronics which soon became known as a manufacturer of very high quality car audio products, it seems strange that a company of such standing would now produce bad products which would surely damage their previously good reputation.
Mr.TT_NZ said:
OK Anton, I see what's happening is that the translator is not coping with what I write so you're not really seeing what I say accurately.
I wish there was a way to read that Russian forum but Google translate seems to work only on the first page of any thread then it's back to Russian for the rest of the pages.
I think I'll just back out and live with the small issues as the units are really very good.
By the way do you know if they are really made by Alps or are they Chinese fakes labelled as Alps?
Many years ago I used to repair valve operated black-and-white television sets, Alps components were used in some of them and were of very good quality. Later Alps formed a subsidiary called Alpine Electronics which soon became known as a manufacturer of very high quality car audio products, it seems strange that a company of such standing would now produce bad products which would surely damage their previously good reputation.
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These are old devices, aftermarket ones remodded by Chinese. They are using tricks to modify an old device and put fake Android 10 or 11 (Oreo 8.1) on them. These are underperforming units.
Real ones , untouched by Chinese and with standard operating system of their own, like Alpine, Kenwood etc. costs too much money.
Hello everybody,
I've got an Erisin head unit.
It was delivered with a generic indoor GPS antenna, and I fixed it on the car's wind-shield.
The problem is that whatever the app I use (Google map, Waze, etc...) positioning accuracy is very poor. I tried many other positions for fixing the antenna on the wind-shield, and even outside the car, the problem is identical. So, I tried another indoor antenna, this time a known brand (Tomtom) and the problem is identical.
I measured voltage on the GPS output port, and it's 3.24V (antenna works in 3 to 5V range).
In the mean time, my phone (Blackberry Key 2) positioned on the dashboard, with exactly the same app is very accurate and smooth.
Have you any ideas of other factor that can influence GPS accuracy ?
Thanks a lot in advance.
Pascal