Thread: Renault "Tuner List" Head Unit/CD changer hacking - Controls

Originally Posted by Vicne

And do you think a problem in the hardware adapter could be the reason (I know I was warned that those optocouplers are very sensitive to resistor values) ? You see, I really think my circuit is about 10000x more error-prone than products from both Via and VDO... :-)

And guess what : that was it :-)

After checking all the connections once again, I discovered that ... I had put a wrong resistor value between GND and pin 4 of the optocoupler (see schematics) : 4K7 instead of the 1K I had calculated. I probably was too concentrated on positioning the components and picked up a wrong resistor that was laying around :-(

Anyway, I fixed that and made a 200km trip and back, and didn't have any link error. So the only think I'll remember is that the schematics and the software are OK :-)

Many thanks to all of you who helped me !

***** DOCUMENT UPDATED *****[/QUOTE]

Thank you so much for your advice. It was so easy! And cost me £5 in parts!
I can now plug any MP3 player in to the stereo in my new Scenic. My mini ISO came with clamps and I just cut a mini jack cable to length and used plyers to crimp the holders in place! Woo Hoo! I bought my ISO connector from conrad-direct.co.uk I will gladly offer advice to anyone trying to do the same thing!

Ale,
I am working with your design but i have a problem,
i use your schematic and programed the pic with the hex included and with the scope i can see a signal in the RX14 pin but i can't activate the spdif input in the HU,
something is wrong but i cant find the problem,
i tested with the pc and a max232 circuit and i can select the aux input but with the pic i can't
and i tested the pic connected to my pc serial port and i cant see any communication in the hyperterminal
do i have to do anything else with the pic code before program it?

Hey ppl, i hope some of yous can help me.
I have a grand scenic and the radio has a selection for aux port but i've looked high and low and i cant find it anywhere. Can you tell me what cable i need to connect my iPod and where do i stick that cable. Thanks a mill.

Originally Posted by higgins

Hey ppl, i hope some of yous can help me.
I have a grand scenic and the radio has a selection for aux port but i've looked high and low and i cant find it anywhere. Can you tell me what cable i need to connect my iPod and where do i stick that cable. Thanks a mill.

You say you have a selection for aux port, then I guess your HU has "Update List" printed on the front.
If so, I think all the information you need to make this work is contained in this document created by PutPut (cfr this post)
Hope it helps.
Vicne

I'm want to build the stand alone emulator, but where can I by a PIC 16F688? Or can I use a different model of the PIC-family?

//Marcus Löfstrand

Originally Posted by nation

Ale,
I am working with your design but i have a problem,
i use your schematic and programed the pic with the hex included and with the scope i can see a signal in the RX14 pin but i can't activate the spdif input in the HU,
something is wrong but i cant find the problem,
i tested with the pc and a max232 circuit and i can select the aux input but with the pic i can't
and i tested the pic connected to my pc serial port and i cant see any communication in the hyperterminal
do i have to do anything else with the pic code before program it?

Check the configuration word in the winpic should be 0x30e4.
if you use the internal oscillator check if the bit time is 104uS.
adjust value of register osctune (in the main routine) to obtain the correct time.

Originally Posted by lond

I'm want to build the stand alone emulator, but where can I by a PIC 16F688? Or can I use a different model of the PIC-family?

//Marcus Löfstrand

Yes you can use any model that include a usart.

Originally Posted by Ale

Yes you can use any model that include a usart.

I can get a PIC16F628 at my local electronic store.

Can you plz compile the code fore me?

//Marcus Löfstrand