| Author | Topic |
|---|
Posts: 8
Location: Cambridge, UK
Registered:
May 2007
|
|
CD Changer connections/protocol?
|
Tue, 29 May 2007 04:05
|
 |
Hi all
I'm looking to hook up my MP3 player to the stock head unit on a 2000 V40 (it's the version with both tape and CD slots).
Does anyone know if this head unit is capable of interfacing with a CD changer? I was planning to use the AUX input and track select options with the MP3 player. Which connections do what? Also, does anyone know how it signals the CD changer to change tracks, play, pause, switch CDs etc? If there's a technical manual for this thing somewhere, could you point me in the right direction?
Thanks!
|
|
|
Posts: 121
Location: Slovenia
Registered:
March 2007
|
|
Re: CD Changer connections/protocol?
|
Tue, 29 May 2007 13:28
|
|
The old SC-xxx radios were compatible with some Alpine CD-Changers, cd and mp3 based as well
But you got HU-xxx radio, like me, right? In that case, forget about the knowing anything about protocol itself, unless you go to reverse engineering it by yourself. Some rare people did it, but I doubt they will share that information to anybody 
You can use adapters of course. Usa-spec is available, but poor in functions and quality. I suggest you to go to http://www.imiv.ca and order one of those. Model IMIV is available now and it supports iPod, one audio-in, and one video-in. IMII and IM++ will be available soon and they are more simpler and cheaper than IMIV. They are supporting two audio-in (IMII) ; or one audio-in and one video-in (IM++)
[Updated on: Tue, 29 May 2007 13:49]
|
|
|
Posts: 4
Registered:
May 2007
|
|
Re: CD Changer connections/protocol?
|
Thu, 31 May 2007 14:49
|
|
Hi!
If you are like me and like to mess around with electronics.. you can build a simple adapter to get line-in on SC-xxx (I use it my self to connect my MP3 player, but only line-in yet.. no control of the mp3 player itself). The software in the PIC works like an emulator so you can press the buttons and change discs, it all looks like an connected cd-changer.
Simple, well you need a microchip 16F877A, some parts, soldering iron and PIC programmer.
checkout http://banned.mine.nu/~plastiq/mbus its a simple guide written by me, in swedish (ouch), but just download the source/hex files and look at the simple schematics at the bottom of the page.
I haven't had the time to draw a proper schematic of the finished circuit i use myself..
Great forum btw!
cheers
|
|
|
Posts: 8
Location: Cambridge, UK
Registered:
May 2007
|
|
Re: CD Changer connections/protocol?
|
Thu, 31 May 2007 15:11
|
|
Hi
Thanks for the link - I actually have a HU-605 model, but it might be possible to adapt your code and method to this one. I'll pop the oscilloscope out next week and see if I can work out what all the connections do. You mention "M-BUS" on your circuit diagram - do you know if that's the same thing as MELBUS (which the HU-xxx versions use)?
Cheers!
|
|
|
Posts: 121
Location: Slovenia
Registered:
March 2007
|
|
Re: CD Changer connections/protocol?
|
Thu, 31 May 2007 15:29
|
|
|
As far as I know, SC-xxx are NOT compatible with HU-xxx. SC uses Alpine protocol, and HU uses a Mitsubishi one.
|
|
|
Posts: 4
Registered:
May 2007
|
|
Re: CD Changer connections/protocol?
|
Fri, 01 June 2007 03:27
|
|
Yeah, I think you may be correct about Melbus not working with my circuit, didn't notice you had the HU model stereo.
Does anyone have a pinout for the HU-xxx units and/or is there any "open" specification for that interface? I'd like to make my project compatible with both types..
M-Bus is the standard i believe Alpine is using.
*/Johnny
|
|
|
Posts: 8
Location: Cambridge, UK
Registered:
May 2007
|
|
Re: CD Changer connections/protocol?
|
Fri, 01 June 2007 10:50
|
|
Thanks for your ideas - I've decided to go the iMIV route and have ordered one of those (just have to wait for them to have some in stock now...)
I've also picked up an Ipod with a dodgy battery on Ebay, so that should be all that's needed 
Not cheap, but there ya go, and the whole kit can live in the car permanently - I only need to take it out to update the songs every so often.
|
|
|
Posts: 4
Registered:
May 2007
|
|
|
Posts: 121
Location: Slovenia
Registered:
March 2007
|
|
Re: CD Changer connections/protocol?
|
Tue, 08 December 2009 08:56
|
|
|
I could have sworn, there was a similiar way, how to activate cd-chgr on HU radios, by programming (Atmel?) mcu. Was that part of the topic lost during the server crash or something?
|
|
|
Posts: 4
Registered:
May 2007
|
|
Re: CD Changer connections/protocol?
|
Tue, 08 December 2009 10:53
|
|
Yes!
I've developed Atmel software (in AVR GCC) for emulating CD-C/MD-C/TV/SAT etc on the HU-range.
Here is the files I've released as opensource!
http://sourceforge.net/projects/melbusemulator/
|
|
|
Posts: 1
Registered:
July 2010
|
|
Re: CD Changer connections/protocol?
|
Wed, 14 July 2010 08:56
|
|
| johnnype wrote on Tue, 08 December 2009 10:53 |
Yes!
I've developed Atmel software (in AVR GCC) for emulating CD-C/MD-C/TV/SAT etc on the HU-range.
Here is the files I've released as opensource!
http://sourceforge.net/projects/melbusemulator/
|
Hi,
Did you close your project? I can't see any files there 
Can you email me your melbus emulator schematics and program? dranron[at ]gmail.com
Thanks!
|
|
|
Re: CD Changer connections/protocol?