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PICList Thread
'PIC controlling Sony car cd'
1999\01\30@182119 by Matthew Ballinger

picon face
       I once had my steering wheel mounted cruise control switches fed to PIC
then
to the car stereo and the cruise control. I could control my cruise, volume
and track functions just by pushing both buttons at once to change function. I
wired the stereo inputs directly to the switches in the sony cd player. No big
deal. Now I have a detchable face head unit and would like to do the same
thing. Before I start reverse engineering the bus used between the face and
the main unit, I figured I  ask if anyone happens to know a bit about it.
Protocol? I2C? Parallel? Any feed back would be greatly appriaciated. Thank
you all.

1999\01\31@233409 by Matthew Ballinger

picon face
       Once again I'll post this. I keep getting back PICLIST postings saying t
hat
this or something like it has already been posted and to add a sentence or 2
to change the content. I don't think so but, have I already posted this?
       I once had my steering wheel mounted cruise control switches fed to PIC
then
to the car stereo and the cruise control. I could control my cruise, volume
and track functions just by pushing both buttons at once to change function. I
wired the stereo inputs directly to the switches in the sony cd player. No big
deal. Now I have a detchable face head unit and would like to do the same
thing. Before I start reverse engineering the bus used between the face and
the main unit, I figured I  ask if anyone happens to know a bit about it.
Protocol? I2C? Parallel? Any feed back would be greatly appriaciated. Thank
you all.


'PIC controlling Sony car CD'
1999\02\01@051016 by paulb
flavicon
face
Matthew Ballinger wrote:

> Once again I'll post this.

 Not necessarily a good idea considering your following sentence!
Repeat postings are dimly viewed by many.

> I keep getting back PICLIST postings saying that this or something
> like it has already been posted

 OK, it's telling you it *was* posted!  We've all seen it.  And if you
read the list, you will note reports of the present "echo" problem.

> and to add a sentence or 2 to change the content.

 Perhaps it shouldn't say that!  Oh dear!  You have to be careful what
you write in "help" messsages.  Unless, of course, you happen to work
for M$.

> I don't think so but, have I already posted this?

 You don't think so?  You are re-sending it but don't remember
sending it before?  You bet you have.  At least once.  Can't say - I
deleted them all.

> I once had my steering wheel mounted cruise control switches fed to
...
> I figured I ask if anyone happens to know a bit about it.

 It appears no-one does, thus the stony silence.  There is no-one on
the list (obviously) to tell you "No, no-one has an answer for you".

 Don't entirely give up hope for two reasons - firstly, some people
read the list quite infrequently but may have information.  Secondly,
some may have information which they have to dig out - may take a while.
I sometimes reply to a message weeks later FWIW.  However I have *no*
ideas about Sony steering wheels.
--
 Cheers,
       Paul B.

1999\02\01@125227 by Bob Blick

face
flavicon
face
Manufacturers of consumer electronics don't seem to be the most
DIY-friendly bunch. I have a feeling you'll have to figure the protocol
out yourself. I gave up trying to get info on the Pioneer "P-bus". If I
had a changer to go with my changer-control deck I'd give a shot at
figuring it out, but as it is, people like us are not important to Sony
and Pioneer. You'd think that a good service manual would contain that
information, but service manuals have gotten pretty slim.

I once complained to NEC about the lack of real information in service
manuals. The answer I got(perhaps more frank than poilically correct) was
that the company did not think there was anyone in the U.S. smart enough
to need that much information.

Cheers,
Bob


'PIC controlling Sony car CD'
1999\06\04@203705 by Matthew Ballinger
picon face
In a message dated 6/4/99 6:09:22 PM Eastern Daylight Time,
spam_OUTadolfusTakeThisOuTspamsofthome.net writes:

{Quote hidden}

       Actually it was much easier than expected to interface with. After
inspection of the face, I realized that all the buttons did when pushed is
put some value of resistance in between 1 of the 5 or 6 conacts on the face
connector and ground. Using my multimeter I just found the connections and
resistance value of each button I would use. I then soldered small wires the
PC board side of the main head unit connector contacts and used a pot to
insert the right amount of resistance and a 4066 bilateral switch fed by the
PIC to do the switching. It worked great. Good Luck! Matt

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